166-559: Effects Other wikis Hurricane Irma was an extremely powerful and devastating tropical cyclone that was the first Category 5 hurricane to strike the Leeward Islands on record, followed by Maria two weeks later. At the time, it was considered the most powerful hurricane on record in the open Atlantic region, outside of the Caribbean Sea and Gulf of Mexico , until it was surpassed by Hurricane Dorian two years later. It
332-651: A Cayo Guillermo resort were evacuated by helicopter. The NHC issued several watches and warnings for the Southeastern United States . The first watches and warnings were issued at 15:00 UTC on September 7, which was a hurricane watch from the Jupiter Inlet to Bonita Beach , including the Florida Keys and Lake Okeechobee . The watches and warnings were extended into Georgia and South Carolina on September 9. At 21:00 UTC on that day,
498-518: A Tropical Cyclone Warning Centre by the World Meteorological Organization 's (WMO) tropical cyclone programme. These warning centers issue advisories which provide basic information and cover a systems present, forecast position, movement and intensity, in their designated areas of responsibility. Meteorological services around the world are generally responsible for issuing warnings for their own country. There are exceptions, as
664-529: A tropical wave near the Cape Verde Islands on August 30. Favorable conditions allowed Irma to rapidly intensify into a Category 3 hurricane on the Saffir–Simpson wind scale by late on August 31. The storm's intensity fluctuated between Categories 2 and 3 for the next several days, due to a series of eyewall replacement cycles . On September 4, Irma resumed intensifying, becoming
830-416: A 1.5 degree warming lead to "increased proportion of and peak wind speeds of intense tropical cyclones". We can say with medium confidence that regional impacts of further warming include more intense tropical cyclones and/or extratropical storms. Climate change can affect tropical cyclones in a variety of ways: an intensification of rainfall and wind speed, a decrease in overall frequency, an increase in
996-444: A 2019 review paper show a future increase of rainfall rates. Additional sea level rise will increase storm surge levels. It is plausible that extreme wind waves see an increase as a consequence of changes in tropical cyclones, further exacerbating storm surge dangers to coastal communities. The compounding effects from floods, storm surge, and terrestrial flooding (rivers) are projected to increase due to global warming . There
1162-760: A Category 4 hurricane at 06:00 UTC on September 10, as deep convection improved and the eye became better defined. The cyclone made landfall in Cudjoe Key, Florida , at 13:00 UTC on September 10, at Category 4 intensity, with winds of 130 mph (210 km/h). Increasing wind shear and land interaction caused the satellite appearance of the storm to become ragged later that day, and Irma weakened to Category 3 intensity before making its seventh and final landfall at 19:30 UTC, in Marco Island, Florida , with sustained winds of 115 mph (185 km/h). Once Irma had moved inland, it began to accelerate to
1328-659: A Category 4 hurricane, but the storm re-attained Category 5 status before making landfall in Cuba . Although Irma briefly weakened to a Category 2 storm while making landfall on Cuba, the system re-intensified to Category 4 status as it crossed the warm waters of the Straits of Florida , before making landfall on Cudjoe Key on September 10. Irma then weakened to Category 3 status, prior to another landfall in Florida on Marco Island later that day. The system degraded into
1494-433: A Category 5 hurricane by early on the next day. Early on September 6, Irma peaked with 1-minute sustained winds of 180 mph (290 km/h) and a minimum pressure of 914 hPa (27.0 inHg). Irma was the second-most intense tropical cyclone worldwide in 2017 in terms of barometric pressure, and the strongest worldwide in 2017 in terms of wind speed. Another eyewall replacement cycle caused Irma to weaken back to
1660-590: A circle, whirling round their central clear eye , with their surface winds blowing counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere . The opposite direction of circulation is due to the Coriolis effect . Tropical cyclones tend to develop during the summer, but have been noted in nearly every month in most tropical cyclone basins . Tropical cyclones on either side of
1826-607: A combined €1.2 billion (US$ 1.43 billion) in insured losses across the French territories of Saint-Martin and Saint Barts. This total covered private property such as homes, vehicles and businesses (including lost revenue); the extent of the damage to infrastructural and public facilities remains undetermined. Nonetheless, this made Irma one of the costliest natural disasters to hit the French Republic in 50 years. On January 30, 2018, roughly five months after Irma, an analysis
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#17328449773651992-464: A density of 111.04 inhabitants/sq mi (42.872/km ), compared to 93.844/sq mi (36.233/km ) for the nation as a whole. While conterminous U.S. has the precise meaning of contiguous U.S. (both adjectives meaning "sharing a common boundary"), other terms commonly used to describe the 48 contiguous states have a greater degree of ambiguity. Because Alaska is also a part of North America , the term continental United States also includes that state, so
2158-512: A direct hit, more than half of the residents on Barbuda took shelter, and relief supplies were preemptively mobilized. The National Emergency Management Organization on Saint Lucia urged small craft operators and swimmers to be mindful of forecasts for high surf. Small Craft Warnings and High Surf Advisories were hoisted for Dominica , where residents were urged to remain vigilant of the potential for high waves, landslides, and flooding. In Guadeloupe, low-lying and cliff-edge homes were evacuated at
2324-406: A few hours on September 9. It was the first time that the shoulder-use plan, which was introduced at the start of the 2017 hurricane season, was implemented by the state for hurricane evacuations. The shoulder-use plan was implemented in place of labor- and resource-intensive contraflow lane reversal , in which both sides of an interstate highway are used for one direction of traffic. Officials from
2490-405: A flow of warm, moist, rapidly rising air, which starts to rotate cyclonically as it interacts with the rotation of the earth. Several factors are required for these thunderstorms to develop further, including sea surface temperatures of around 27 °C (81 °F) and low vertical wind shear surrounding the system, atmospheric instability, high humidity in the lower to middle levels of
2656-443: A gas station. Satellite images revealed many of the island's residential zones had been left in ruins. The hurricane passed over Necker Island , also causing severe damage and destroying the mansion of Richard Branson . Most homes and businesses were destroyed on the island of Jost Van Dyke , the smallest of the B.V.I.'s four main islands. The Governor , Gus Jaspert , who had only been sworn into office 13 days previously, declared
2822-506: A higher intensity. Most tropical cyclones that experience rapid intensification are traversing regions of high ocean heat content rather than lower values. High ocean heat content values can help to offset the oceanic cooling caused by the passage of a tropical cyclone, limiting the effect this cooling has on the storm. Faster-moving systems are able to intensify to higher intensities with lower ocean heat content values. Slower-moving systems require higher values of ocean heat content to achieve
2988-460: A large number of forecasting centers, uses infrared geostationary satellite imagery and an algorithm based upon the Dvorak technique to assess the intensity of tropical cyclones. The ADT has a number of differences from the conventional Dvorak technique, including changes to intensity constraint rules and the usage of microwave imagery to base a system's intensity upon its internal structure, which prevents
3154-464: A large role in both the classification of a tropical cyclone and the determination of its intensity. Used in warning centers, the method was developed by Vernon Dvorak in the 1970s, and uses both visible and infrared satellite imagery in the assessment of tropical cyclone intensity. The Dvorak technique uses a scale of "T-numbers", scaling in increments of 0.5 from T1.0 to T8.0. Each T-number has an intensity assigned to it, with larger T-numbers indicating
3320-426: A much smaller area. This replenishing of moisture-bearing air after rain may cause multi-hour or multi-day extremely heavy rain up to 40 km (25 mi) from the coastline, far beyond the amount of water that the local atmosphere holds at any one time. This in turn can lead to river flooding , overland flooding, and a general overwhelming of local water control structures across a large area. A tropical cyclone
3486-399: A number of houses. In The Valley , the island's capital, the hurricane blew out the windows of government buildings. Rough seas inflicted heavy damage upon several bays and harbors, and a seaside restaurant was completely eradicated. About 90% of roads were left impassable. The island's air traffic control tower was damaged, exacerbating the already poor communication with the island. One death
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#17328449773653652-493: A number of techniques considered to try to artificially modify tropical cyclones. These techniques have included using nuclear weapons , cooling the ocean with icebergs, blowing the storm away from land with giant fans, and seeding selected storms with dry ice or silver iodide . These techniques, however, fail to appreciate the duration, intensity, power or size of tropical cyclones. A variety of methods or techniques, including surface, satellite, and aerial, are used to assess
3818-482: A peak sustained wind speed of 55 mph (89 km/h) at a weather station along San Juan Bay , while the same site observed a peak wind gust of 74 mph (119 km/h). However, on the island of Culebra , a wind gust of 111 mph (179 km/h) was reported. Mainly due to strong winds, approximately 1.1 million out of 1.5 million of Puerto Rico Electric Power Authority 's customers lost electricity. Portions of Puerto Rico received heavy rainfall, with
3984-496: A peak total of 13.04 in (331 mm) in Bayamón , causing seven rivers to reach flood stage, widespread flash flooding, and at least six landslides. The most severely affected areas included the offshore islands of Culebra and Vieques , as well as the northeastern, northern, and mountainous portions of the main island. On Culebra, the island suffered an almost complete loss of electrical and water services. At least 30 homes on
4150-422: A process known as rapid intensification, a period in which the maximum sustained winds of a tropical cyclone increase by 30 kn (56 km/h; 35 mph) or more within 24 hours. Similarly, rapid deepening in tropical cyclones is defined as a minimum sea surface pressure decrease of 1.75 hPa (0.052 inHg) per hour or 42 hPa (1.2 inHg) within a 24-hour period; explosive deepening occurs when
4316-429: A remnant low-pressure area . Remnant systems may persist for several days before losing their identity. This dissipation mechanism is most common in the eastern North Pacific. Weakening or dissipation can also occur if a storm experiences vertical wind shear which causes the convection and heat engine to move away from the center. This normally ceases the development of a tropical cyclone. In addition, its interaction with
4482-677: A remnant low over Alabama and ultimately dissipated on September 13 over Missouri . The storm caused catastrophic damage in Barbuda , Saint Barthélemy , Saint Martin , Anguilla , and the Virgin Islands as a Category 5 hurricane. The hurricane caused at least 134 deaths: one in Anguilla ; one in Barbados ; three in Barbuda ; four in the British Virgin Islands ; 10 in Cuba ; 11 in
4648-534: A state of emergency - the first time this has ever happened in the Territory. After the storm, restoration of electricity took approximately 5 months. Irma's effects in the U.S. Virgin Islands were most profound on Saint Thomas , where at least 12 inches (300 mm) of rain fell, and on Saint John . Saint Thomas island suffered widespread structural damage, including to its police station and airport. Patients from
4814-402: A state of emergency initially for all six coastal counties on September 6, but eventually expanded the declaration to 94 counties south of Atlanta metropolitan area , and then the entire state on September 10. Atlanta was placed under its first-ever tropical storm warning. Governor Deal ordered mandatory evacuations for all areas east of Interstate 95 on September 7, before extending
4980-459: A state of emergency on September 6, with South Carolina Governor Henry McMaster following suit the same day. Governor of Virginia Terry McAuliffe declared a state of emergency on September 8 in order to protect Virginia residents and to mobilize resources in support of neighboring states. Officials in New Orleans stated that there would not be much time for preparations if Irma failed to make
5146-441: A state, it was properly included within the continental U.S. due to being an incorporated territory . The term mainland United States is sometimes used synonymously with continental United States , but technically refers only to those parts of states connected to the landmass of North America, thereby excluding not only Hawaii and overseas insular areas , but also islands which are part of continental states but separated from
Hurricane Irma - Misplaced Pages Continue
5312-562: A storm. Tropical cyclone scales , such as the Saffir-Simpson hurricane wind scale and Australia's scale (Bureau of Meteorology), only use wind speed for determining the category of a storm. The most intense storm on record is Typhoon Tip in the northwestern Pacific Ocean in 1979, which reached a minimum pressure of 870 hPa (26 inHg ) and maximum sustained wind speeds of 165 kn (85 m/s; 305 km/h; 190 mph). The highest maximum sustained wind speed ever recorded
5478-565: A stronger system. Tropical cyclones are assessed by forecasters according to an array of patterns, including curved banding features , shear, central dense overcast, and eye, to determine the T-number and thus assess the intensity of the storm. The Cooperative Institute for Meteorological Satellite Studies works to develop and improve automated satellite methods, such as the Advanced Dvorak Technique (ADT) and SATCON. The ADT, used by
5644-405: A system has dissipated or lost its tropical characteristics, its remnants could regenerate a tropical cyclone if environmental conditions become favorable. A tropical cyclone can dissipate when it moves over waters significantly cooler than 26.5 °C (79.7 °F). This will deprive the storm of such tropical characteristics as a warm core with thunderstorms near the center, so that it becomes
5810-518: A tropical cyclone are a result of the conservation of angular momentum imparted by the Earth's rotation as air flows inwards toward the axis of rotation. As a result, cyclones rarely form within 5° of the equator . Tropical cyclones are very rare in the South Atlantic (although occasional examples do occur ) due to consistently strong wind shear and a weak Intertropical Convergence Zone . In contrast,
5976-675: A tropical cyclone is called a hurricane ( / ˈ h ʌr ɪ k ən , - k eɪ n / ), typhoon ( / t aɪ ˈ f uː n / ), tropical storm , cyclonic storm , tropical depression , or simply cyclone . A hurricane is a strong tropical cyclone that occurs in the Atlantic Ocean or northeastern Pacific Ocean . A typhoon occurs in the northwestern Pacific Ocean. In the Indian Ocean and South Pacific, comparable storms are referred to as "tropical cyclones". In modern times, on average around 80 to 90 named tropical cyclones form each year around
6142-461: A tropical cyclone's core has a negative effect on its development and intensity by diminishing atmospheric convection and introducing asymmetries in the storm's structure. Symmetric, strong outflow leads to a faster rate of intensification than observed in other systems by mitigating local wind shear. Weakening outflow is associated with the weakening of rainbands within a tropical cyclone. Tropical cyclones may still intensify, even rapidly, in
6308-401: A tropical cyclone's intensity or the direction it is traveling. Wind-pressure relationships (WPRs) are used as a way to determine the pressure of a storm based on its wind speed. Several different methods and equations have been proposed to calculate WPRs. Tropical cyclones agencies each use their own, fixed WPR, which can result in inaccuracies between agencies that are issuing estimates on
6474-528: A two-digit number and suffix letter by the warning centers that monitor them. Contiguous United States The contiguous United States (officially the conterminous United States ) consists of the 48 adjoining U.S. states and the District of Columbia of the United States in central North America . The term excludes the only two non- contiguous states, which are Alaska and Hawaii (they are also
6640-813: A typhoon. This happened in 2014 for Hurricane Genevieve , which became Typhoon Genevieve. Within the Southern Hemisphere, it is either called a hurricane, tropical cyclone or a severe tropical cyclone, depending on if it is located within the South Atlantic, South-West Indian Ocean, Australian region or the South Pacific Ocean. The descriptors for tropical cyclones with wind speeds below 65 kn (120 km/h; 75 mph) vary by tropical cyclone basin and may be further subdivided into categories such as "tropical storm", "cyclonic storm", "tropical depression", or "deep depression". The practice of using given names to identify tropical cyclones dates back to
6806-404: A water supply network on that island lost power during the storm, leaving several communes in the dark without running water. Overall damage was limited to external parts of houses and trees that were blown onto roads and three unmanned ships wrecked by rough seas. Saint Kitts and Nevis endured similar conditions to other islands. Blustery rainstorms triggered scattered power outages and disabled
Hurricane Irma - Misplaced Pages Continue
6972-469: Is actual land, composing 83.65 percent of the country's total land area, and is comparable in size to the area of Australia. Officially, 160,820.25 square miles (416,522.5 km ) of the contiguous United States is water area, composing 62.66 percent of the nation's total water area. The contiguous United States, if it were a country, would be fifth on the list of countries and dependencies by area , behind Russia , Canada , China , and Brazil . However,
7138-783: Is also on North America, but separated from the 48 states by British Columbia in Canada, but excludes Hawaii and all the insular areas in the Caribbean and the Pacific . The greatest distance (on a great-circle route) entirely within the contiguous U.S. is 2,802 miles (4,509 km), coast-to-coast between Florida and the State of Washington ; the greatest north–south line is 1,650 miles (2,660 km). The contiguous United States occupies an area of 3,119,884.69 square miles (8,080,464.3 km ). Of this area, 2,959,064.44 square miles (7,663,941.7 km )
7304-415: Is assumed at this stage that a tropical cyclone has become self-sustaining and can continue to intensify without any help from its environment. Depending on its location and strength, a tropical cyclone is referred to by different names , including hurricane , typhoon , tropical storm , cyclonic storm , tropical depression , or simply cyclone . A hurricane is a strong tropical cyclone that occurs in
7470-406: Is calculated as: where p {\textstyle p} is the density of air, u {\textstyle u} is a sustained surface wind speed value, and d v {\textstyle d_{v}} is the volume element . Around the world, tropical cyclones are classified in different ways, based on the location ( tropical cyclone basins ), the structure of
7636-545: Is currently no consensus on how climate change will affect the overall frequency of tropical cyclones. A majority of climate models show a decreased frequency in future projections. For instance, a 2020 paper comparing nine high-resolution climate models found robust decreases in frequency in the Southern Indian Ocean and the Southern Hemisphere more generally, while finding mixed signals for Northern Hemisphere tropical cyclones. Observations have shown little change in
7802-414: Is cut off from its supply of warm moist maritime air and starts to draw in dry continental air. This, combined with the increased friction over land areas, leads to the weakening and dissipation of the tropical cyclone. Over a mountainous terrain, a system can quickly weaken. Over flat areas, it may endure for two to three days before circulation breaks down and dissipates. Over the years, there have been
7968-445: Is the generic term for a warm-cored, non-frontal synoptic-scale low-pressure system over tropical or subtropical waters around the world. The systems generally have a well-defined center which is surrounded by deep atmospheric convection and a closed wind circulation at the surface. A tropical cyclone is generally deemed to have formed once mean surface winds in excess of 35 kn (65 km/h; 40 mph) are observed. It
8134-502: Is the greatest. However, each particular basin has its own seasonal patterns. On a worldwide scale, May is the least active month, while September is the most active month. November is the only month in which all the tropical cyclone basins are in season. In the Northern Atlantic Ocean , a distinct cyclone season occurs from June 1 to November 30, sharply peaking from late August through September. The statistical peak of
8300-405: Is the storm's wind speed and r {\textstyle r} is the radius of hurricane-force winds. The Hurricane Severity Index is a scale that can assign up to 50 points to a system; up to 25 points come from intensity, while the other 25 come from the size of the storm's wind field. The IKE model measures the destructive capability of a tropical cyclone via winds, waves, and surge. It
8466-608: The African easterly jet and areas of atmospheric instability give rise to cyclones in the Atlantic Ocean and Caribbean Sea . Heat energy from the ocean acts as the accelerator for tropical cyclones. This causes inland regions to suffer far less damage from cyclones than coastal regions, although the impacts of flooding are felt across the board. Coastal damage may be caused by strong winds and rain, high waves (due to winds), storm surges (due to wind and severe pressure changes), and
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#17328449773658632-642: The Alcorn State Braves was moved up a day and relocated to Legion Field in Birmingham, Alabama . The Georgia Southern Eagles game against the New Hampshire Wildcats on September 9 was also moved to Legion Field for that day. As of September 5, Federal Emergency Management Agency (FEMA) funding was running dangerously low, due to its response to Hurricane Harvey in Texas the previous week, prompting
8798-507: The Atlantic Ocean or northeastern Pacific Ocean , and a typhoon occurs in the northwestern Pacific Ocean. In the Indian Ocean and South Pacific, comparable storms are referred to as "tropical cyclones", and such storms in the Indian Ocean can also be called "severe cyclonic storms". Tropical refers to the geographical origin of these systems, which form almost exclusively over tropical seas. Cyclone refers to their winds moving in
8964-510: The British Virgin Islands . Irma maintained Category 5 strength for several days as it passed north of the Greater Antilles . After beginning an eyewall replacement cycle , Irma weakened to a Category 4 hurricane as it passed south of the Turks and Caicos Islands early on September 8, subsequently ending the 60-hour contiguous period of Irma maintaining Category 5 intensity,
9130-665: The Dajabón River connecting the two countries was broken. In the Dominican Republic, the fishing community of Nagua sustained damage from waves that destroyed homes. 55,000 soldiers were deployed to affected areas to help with the cleanup efforts. By the evening of September 7, the government had counted 2,721 damaged homes. In Haiti, flooding one meter deep sat in residential neighborhoods in places like Cap-Haïtien , Ouanaminthe , and Gonaives . Mudslides, destroyed homes, flooded crops, and infrastructure damage were reported in
9296-510: The Environmental Protection Agency , which had been criticized for its response to Hurricane Harvey , took special measures to inspect and secure hazardous materials, especially at Superfund sites. Direct Relief , a disaster relief organization, coordinated with local health centers and provided resources to help facilities on the front lines of Floridian and Puerto Rican communities. Georgia Governor Nathan Deal declared
9462-480: The Florida Keys are located, was placed under a mandatory evacuation. Residents in communities near the southern half of Lake Okeechobee were also ordered to leave. Additionally, voluntary evacuation notices were issued for all or parts of Alachua , Baker , Bay , Bradford , Charlotte , Columbia , Desoto , Hardee , Highlands , Hillsborough , Lake , Manatee , Okeechobee , Osceola , and Polk counties. A record 6.5 million Floridians evacuated, making it
9628-482: The Florida Keys . It was also the most intense hurricane to strike the continental United States since Katrina in 2005 , the first major hurricane to make landfall in Florida since Wilma in the same year, and the first Category 4 hurricane to strike the state since Charley in 2004 . The word Irmageddon was coined soon after the hurricane to describe the damage caused by the hurricane. Irma developed from
9794-636: The French West Indies ; one in Haiti ; three in Puerto Rico ; four on the Dutch side of Sint Maarten ; 92 in the contiguous United States , and four in the U.S. Virgin Islands . Hurricane Irma was the top Google searched term in the U.S. and globally in 2017. The National Hurricane Center (NHC) began monitoring a tropical wave over western Africa on August 26. Developing into a tropical depression just west of
9960-618: The Hurricane Surge Index , the Hurricane Severity Index , the Power Dissipation Index (PDI), and integrated kinetic energy (IKE). ACE is a metric of the total energy a system has exerted over its lifespan. ACE is calculated by summing the squares of a cyclone's sustained wind speed, every six hours as long as the system is at or above tropical storm intensity and either tropical or subtropical. The calculation of
10126-559: The Madden–Julian oscillation . The IPCC Sixth Assessment Report summarize the latest scientific findings about the impact of climate change on tropical cyclones. According to the report, we have now better understanding about the impact of climate change on tropical storm than before. Major tropical storms likely became more frequent in the last 40 years. We can say with high confidence that climate change increase rainfall during tropical cyclones. We can say with high confidence that
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#173284497736510292-565: The Northwest Angle in Minnesota are three such places. Alburgh, Vermont , is not directly connected by land, but is accessible by road via bridges from within Vermont and from New York. By contrast, Hyder, Alaska , is physically part of contiguous Alaska and its easternmost town, but the only practical access is by road through Canada or by seaplane. The 48 contiguous states are: In addition,
10458-404: The Saffir–Simpson scale . Climate oscillations such as El Niño–Southern Oscillation (ENSO) and the Madden–Julian oscillation modulate the timing and frequency of tropical cyclone development. Rossby waves can aid in the formation of a new tropical cyclone by disseminating the energy of an existing, mature storm. Kelvin waves can contribute to tropical cyclone formation by regulating
10624-561: The Saffir–Simpson scale . The trend was most clear in the North Atlantic and in the Southern Indian Ocean. In the North Pacific, tropical cyclones have been moving poleward into colder waters and there was no increase in intensity over this period. With 2 °C (3.6 °F) warming, a greater percentage (+13%) of tropical cyclones are expected to reach Category 4 and 5 strength. A 2019 study indicates that climate change has been driving
10790-614: The South Pacific Ocean in Polynesia , south of the equator — it is 2,200 miles (3,500 km) southwest of Hawaii . In American Samoa, the contiguous United States is called the "mainland United States" or "the states"; those not from American Samoa are called palagi (outsiders). Apart from off-shore U.S. islands , a few continental portions of the contiguous United States are accessible by road only by traveling through Canada. Point Roberts, Washington ; Elm Point, Minnesota ; and
10956-525: The Trump administration to request an immediate $ 8 billion in additional funding as Irma approached Florida. Given the rate that current funds are being consumed and the catastrophic damage, the United States Senate almost doubled the requested amount to $ 15.3 billion, with the understanding that this would only be about 10% of what will be required for responding to Harvey. Hurricane Irma's path
11122-529: The Turks and Caicos , evacuation orders were issued for low-lying areas starting September 5. Schools were closed, government buildings were boarded up, and shelters were opened. Officials spread warnings to residents in English, Creole, and Spanish via social media, radio, SMS text, and WhatsApp . In The Bahamas , the government began preparations the week prior to the hurricane's arrival, including securing national sports facilities to use as shelters. By September 7,
11288-514: The troposphere , enough Coriolis force to develop a low-pressure center , and a pre-existing low-level focus or disturbance. There is a limit on tropical cyclone intensity which is strongly related to the water temperatures along its path. and upper-level divergence. An average of 86 tropical cyclones of tropical storm intensity form annually worldwide. Of those, 47 reach strength higher than 119 km/h (74 mph), and 20 become intense tropical cyclones, of at least Category 3 intensity on
11454-714: The 49th state of the United States on January 3, 1959. Alaska is the northwest extremity of the North American continent, separated from the U.S. West Coast by the Canadian province of British Columbia . The term Lower 48 has, for many years, been a common Alaskan equivalent for "contiguous United States"; today, many Alaskans use the term "Outside" for those states, though some may use "Outside" to refer to any location not within Alaska. The territory of Hawaii , consisting of
11620-621: The Atlantic hurricane season is September 10. The Northeast Pacific Ocean has a broader period of activity, but in a similar time frame to the Atlantic. The Northwest Pacific sees tropical cyclones year-round, with a minimum in February and March and a peak in early September. In the North Indian basin, storms are most common from April to December, with peaks in May and November. In the Southern Hemisphere,
11786-635: The Cape Verde Islands early on August 31, becoming Tropical Storm Irma shortly afterwards. Under favorable conditions, Irma underwent rapid intensification , becoming a major hurricane on September 1. Within a 48-hour period, the hurricane's intensity had increased by 65 mph (105 km/h). Fluctuations occurred over the next few days due to internal processes, as The first aircraft reconnaissance mission discovered an eye 29 mi (47 km) in diameter and surface winds of 115 mph (185 km/h) on September 3. As Irma continued approaching
11952-513: The Center for Disaster Management and Risk Reduction Technology (CEDIM), a Germany-based risk management agency, estimate that economic losses for Antigua and Barbuda will exceed $ 120 million. On the morning of September 6, Irma's center crossed the island of Saint Martin while the storm was at peak intensity, sweeping away entire structures, submerging roads and cars, and triggering an island-wide blackout. Irma's extreme winds ripped trees out of
12118-570: The District of Columbia who were born in, or can trace their family ancestry to, Puerto Rico. The U.S. Virgin Islands is a U.S. territory located directly to the east of Puerto Rico in the Caribbean Sea. The term "stateside" is used to refer to the mainland, in relation to the U.S. Virgin Islands (see Stateside Virgin Islands Americans ). American Samoa is a U.S. territory located in
12284-539: The Equator generally have their origins in the Intertropical Convergence Zone , where winds blow from either the northeast or southeast. Within this broad area of low-pressure, air is heated over the warm tropical ocean and rises in discrete parcels, which causes thundery showers to form. These showers dissipate quite quickly; however, they can group together into large clusters of thunderstorms. This creates
12450-534: The French island of Saint Barthélemy , southeast of Saint Martin. Describing the extent of the destruction, one local compared it to "a bomb that burned all vegetation," while another said that it were as if the hurricane had effectively "erased the island from the map". Violent seas swept away entire coastal establishments, with one hotel being stripped of all but its foundation. Streets in the capital of Gustavia were turned into rushing rivers, which carried away vehicles and pieces of furniture. The island's fire station
12616-684: The Interior by the American military organizations of the time—the future states of Alaska and Hawaii , then each only organized incorporated territories of the Union, were respectively covered by the Eleventh Air Force and Seventh Air Force during the war. Residents of Alaska, Hawaii and off-shore U.S. territories have unique labels for the contiguous United States because of their own locations relative to them. The vast territory of Alaska became
12782-558: The Leeward Islands, the hurricane underwent a second and more robust period of rapid intensification, becoming a Category 5 hurricane early on September 5. The extremely powerful hurricane continued to intensify, with maximum sustained winds peaking at 180 mph (290 km/h) shortly afterwards. Irma acquired annular characteristics around this time, with the storm exhibiting a large, symmetric CDO and an impressive satellite appearance. Irma continued to intensify while approaching
12948-629: The PDI is similar in nature to ACE, with the major difference being that wind speeds are cubed rather than squared. The Hurricane Surge Index is a metric of the potential damage a storm may inflict via storm surge. It is calculated by squaring the dividend of the storm's wind speed and a climatological value (33 m/s or 74 mph), and then multiplying that quantity by the dividend of the radius of hurricane-force winds and its climatological value (96.6 km or 60.0 mi). This can be represented in equation form as: where v {\textstyle v}
13114-460: The South Atlantic is not a major basin, and not an official basin according to the WMO. Each year on average, around 80 to 90 named tropical cyclones form around the world, of which over half develop hurricane-force winds of 65 kn (120 km/h; 75 mph) or more. Worldwide, tropical cyclone activity peaks in late summer, when the difference between temperatures aloft and sea surface temperatures
13280-677: The U.S. Federal Emergency Management Agency had deployed response teams in Puerto Rico and the United States Virgin Islands . Supplies, including food rations, medical supplies, and blankets, were pre-staged in strategic locations on the islands for distribution. On September 5, the Dominican Republic activated the International Charter on Space and Major Disasters , thus providing for humanitarian satellite coverage;
13446-585: The United States National Hurricane Center and Fiji Meteorological Service issue alerts, watches and warnings for various island nations in their areas of responsibility. The United States Joint Typhoon Warning Center and Fleet Weather Center also publicly issue warnings about tropical cyclones on behalf of the United States Government . The Brazilian Navy Hydrographic Center names South Atlantic tropical cyclones , however
13612-418: The United States and Haiti followed suit two days later. According to officials, 11,200 people were evacuated from vulnerable areas prior to the storm's arrival. Approximately 7,400 tourists were moved to Santo Domingo , away from beach resorts. In Haiti , government officials and aid organizations struggled with early preparation and evacuation efforts. While some officials blamed reluctance and indifference on
13778-575: The Western Pacific. Tropical cyclones have to have a significant amount of gale-force winds occurring around the center before they are named within the Southern Hemisphere . The names of significant tropical cyclones in the North Atlantic Ocean, Pacific Ocean, and Australian region are retired from the naming lists and replaced with another name. Tropical cyclones that develop around the world are assigned an identification code consisting of
13944-575: The advisories reached their maximum extent, with a hurricane warning covering the entire east coast of the state, the west coast from Indian Pass southward, and the Florida Keys; a hurricane watch was in place from the Florida–;Georgia state line to Edisto Beach, South Carolina ; and there were two tropical storm warnings, one in Florida from Indian Pass to the Okaloosa – Walton county line and
14110-445: The approximately 24,000 restoration personnel who had been activated. Governor Scott suspended tolls on all toll roads in Florida, including the turnpike . All state offices in Florida were closed from September 8 to September 11, while public schools, state colleges, and state universities in all 67 counties were closed during the same period. The Florida Department of Education coordinated with school districts as
14276-579: The building [strewn] across the runway and a jet bridge snapped in half." It demolished or severely damaged about 70% of Sint Maarten's houses, forcing thousands of residents into public shelters. There were 4 deaths and 23 injuries, 11 of which were serious, in the Dutch territory. Irma is considered the worst natural disaster to hit Sint Maarten; the extent of its damage far exceeded that of any previous hurricane. Total damages were estimated at €2.5 billion (US$ 2.98 billion). Irma left widespread destruction and disastrous flooding along its path over
14442-404: The continental United States, and as the 48 contiguous states. The District of Columbia is not always specifically mentioned as being part of CONUS . OCONUS is derived from CONUS with O for outside added, thus referring to Outside of Continental United States. The term lower 48 is also used to refer to the conterminous United States. The National Geographic style guide recommends
14608-419: The core of the hurricane was expected to remain north of the island, a yellow alert was issued for Martinique due to the likelihood of rough seas. The island dispatched relief supplies and military reinforcements to its neighboring islands of Guadeloupe, Saint Martin. and Saint Barthélemy, which faced a greater risk of a direct impact. On September 4, Puerto Rico declared a state of emergency. By September 6,
14774-435: The development of the westerlies . Cyclone formation is usually reduced 3 days prior to the wave's crest and increased during the 3 days after. The majority of tropical cyclones each year form in one of seven tropical cyclone basins, which are monitored by a variety of meteorological services and warning centers. Ten of these warning centers worldwide are designated as either a Regional Specialized Meteorological Centre or
14940-496: The entire Hawaiian Islands archipelago except for Midway Atoll , became the 50th state of the United States on August 21, 1959. It is the southernmost U.S. state, and the latest one to join the Union. Not part of any continent, Hawaii is located in the Pacific Ocean , about 2,200 miles (3,541 km) from North America and almost halfway between North America and Asia . In Hawaii and overseas American territories , for instance,
15106-486: The equator, then move poleward past the ridge axis before recurving into the main belt of the Westerlies . When the subtropical ridge position shifts due to El Niño, so will the preferred tropical cyclone tracks. Areas west of Japan and Korea tend to experience much fewer September–November tropical cyclone impacts during El Niño and neutral years. During La Niña years, the formation of tropical cyclones, along with
15272-481: The eyewall of the storm, and an upper-level anticyclone helps channel this air away from the cyclone efficiently. However, some cyclones such as Hurricane Epsilon have rapidly intensified despite relatively unfavorable conditions. There are a number of ways a tropical cyclone can weaken, dissipate, or lose its tropical characteristics. These include making landfall, moving over cooler water, encountering dry air, or interacting with other weather systems; however, once
15438-410: The form of cold water from falling raindrops (this is because the atmosphere is cooler at higher altitudes). Cloud cover may also play a role in cooling the ocean, by shielding the ocean surface from direct sunlight before and slightly after the storm passage. All these effects can combine to produce a dramatic drop in sea surface temperature over a large area in just a few days. Conversely, the mixing of
15604-430: The fourth and third floors of Charlotte Amalie 's hospital had to be relocated to lower floors due to flooding from roof leaks. Three deaths were attributed to Irma on the island. On nearby Saint Croix , there were communication issues and some damage to the infrastructure. Saint John lost access to ferry and cargo services, along with access to the local airport. Due to its normal reliance on electricity from Saint Thomas,
15770-453: The frequency of very intense storms and a poleward extension of where the cyclones reach maximum intensity are among the possible consequences of human-induced climate change. Tropical cyclones use warm, moist air as their fuel. As climate change is warming ocean temperatures , there is potentially more of this fuel available. Between 1979 and 2017, there was a global increase in the proportion of tropical cyclones of Category 3 and higher on
15936-532: The general public regarding forecasts, watches, and warnings. Since the systems can last a week or longer, and more than one can be occurring in the same basin at the same time, the names are thought to reduce the confusion about what storm is being described. Names are assigned in order from predetermined lists with one, three, or ten-minute sustained wind speeds of more than 65 km/h (40 mph) depending on which basin it originates. Standards vary from basin to basin. Some tropical depressions are named in
16102-522: The government had evacuated 1,609 people by air from the southern islands, including 365 from Bimini . Controlled cutting of the power supply to southern and central Bahamian islands was conducted in advance of the storm. Shelters were made available, though usage was low due to most evacuees staying with family on other islands. Of the 2,679 foreign tourists still in The Bahamas on September 7, about 1,200 were being housed at Atlantis Paradise Island , one of
16268-519: The ground and sent vehicles and debris from damaged structures scattered across the territory. On the French side of Saint-Martin , entire marinas around Marigot were left in ruins, littered with the stranded remnants of boats that had smashed into each other. A hotel caught on fire, but dangerous conditions and impassable roads prevented firefighters from putting out the blaze. Another hotel lost nearly all of its ground floor. Media images depicted devastated room interiors with furniture hurled around after
16434-426: The hurricane also defoliated trees and injured a few people. CEDIM's analysts expect economic losses of $ 20–65 million for the two islands. Damage in the British Virgin Islands was extensive. Numerous buildings and roads were destroyed on the island of Tortola , which bore the brunt of the hurricane's core. Four people were confirmed dead. Along Cane Garden Bay, the storm surge submerged several seaside bars and
16600-472: The hurricane moved over Barbuda near its record peak intensity early on September 6; a weather station observed a wind gust of 160 mph (260 km/h). The same station also recorded a minimum barometric pressure of 916.1 mbar (27.05 inHg). The exact state of the island remained unclear for hours after Irma's passage, as downed phone lines ceased all communication with nearby islands. Later that afternoon, Prime Minister Gaston Browne surveyed
16766-461: The hurricane then made landfall in Cayo Romano, Cuba , at 03:00 UTC on September 9, with winds of 165 mph (266 km/h). This made Irma only the second Category 5 hurricane to strike Cuba in recorded history, after the 1924 Cuba hurricane . As the eye of Irma moved along the northern coast of Cuba, gradual weakening ensued due to land interaction, with the eye becoming cloud-filled and
16932-461: The intensity falling to a high-end Category 2 storm later on September 9. After slowing down late on September 9, the hurricane turned northwestward towards Florida around the southwestern edge of the subtropical high to its northeast and a low-pressure system that was located over the continental United States . Moving over the warm waters of the Straits of Florida, Irma quickly restrengthened to
17098-451: The intensity from leveling off before an eye emerges in infrared imagery. The SATCON weights estimates from various satellite-based systems and microwave sounders , accounting for the strengths and flaws in each individual estimate, to produce a consensus estimate of a tropical cyclone's intensity which can be more reliable than the Dvorak technique at times. Multiple intensity metrics are used, including accumulated cyclone energy (ACE),
17264-522: The intensity of a tropical cyclone. Reconnaissance aircraft fly around and through tropical cyclones, outfitted with specialized instruments, to collect information that can be used to ascertain the winds and pressure of a system. Tropical cyclones possess winds of different speeds at different heights. Winds recorded at flight level can be converted to find the wind speeds at the surface. Surface observations, such as ship reports, land stations, mesonets , coastal stations, and buoys, can provide information on
17430-399: The island was left without power. Total damage from the three islands was at least $ 1.1 billion. The hurricane passed north of Puerto Rico , but still caused significant damage to the United States territory. Along the coast, a tide gauge observed waves up to 1.5 ft (0.46 m) mean higher high water . Much of the main island experienced sustained tropical storm force winds, with
17596-877: The island were destroyed, while about 30 other experienced substantial damage. High winds also toppled a number of trees. The only telecommunications tower on Culebra sustained damage, cutting off outside communications for several hours. In rural Loíza , 79 homes were destroyed. Throughout Puerto Rico, 781 out of 1,600 telecommunications towers went out of commission, primarily due to power outages. At least 362,000 customers lost water services. Debris, mostly fallen trees, blocked at least 72 roads. Approximately 25% to 30% of banana, coffee, papaya, and plantain crops were damaged by strong winds, with losses to farmers estimated at $ 30.6 million. Approximately 1,530 homes experienced at least moderate damage, with 1,448 homes moderately damaged, 32 extensively damaged, and 50 completely destroyed. Hurricane Irma
17762-539: The island's water system, but per the International Red Cross , the islands were spared the level of destruction seen elsewhere. Still, Prime Minister Timothy Harris stated that property and infrastructure had sustained "significant damage." The Dutch territories of Saba and Sint Eustatius were also struck by the hurricane's winds, resulting in infrastructural damage, water shortages and telecommunication outages. Several houses were left uninhabitable. On Saba,
17928-430: The island. In addition to the catastrophic impact on Barbuda's human residents, concern turned to the storm's effects on the island's wildlife. The island's only endemic bird, the near-threatened Barbuda warbler , numbered less than 2,000 individuals prior to the hurricane. For some time it was unknown if the warbler survived the hurricane or its aftermath; however within a few months it was confirmed that not only did
18094-449: The largest evacuation in the state's history. Evacuees caused significant traffic congestion on northbound Interstate 95 , Interstate 75 , and Florida's Turnpike, exacerbated by the fact that the entire Florida peninsula was within the cone of uncertainty in the NHC's forecast path in the days before the storm, so evacuees from both coasts headed north, as evacuees would not be safer by fleeing to
18260-471: The last two states to be admitted to the Union ), and all other offshore insular areas , such as the U.S. territories of American Samoa , Guam , the Northern Mariana Islands , Puerto Rico , and the U.S. Virgin Islands . The colloquial term " Lower 48 " is also used, especially in relation to Alaska. The related but distinct term continental United States includes Alaska, which
18426-674: The late 1800s and early 1900s and gradually superseded the existing system—simply naming cyclones based on what they hit. The system currently used provides positive identification of severe weather systems in a brief form, that is readily understood and recognized by the public. The credit for the first usage of personal names for weather systems is generally given to the Queensland Government Meteorologist Clement Wragge who named systems between 1887 and 1907. This system of naming weather systems fell into disuse for several years after Wragge retired, until it
18592-404: The main belt of the Westerlies , by means of merging with a nearby frontal zone, can cause tropical cyclones to evolve into extratropical cyclones . This transition can take 1–3 days. Should a tropical cyclone make landfall or pass over an island, its circulation could start to break down, especially if it encounters mountainous terrain. When a system makes landfall on a large landmass, it
18758-577: The mainland, such as the Aleutian Islands ( Alaska ), San Juan Islands ( Washington ), the Channel Islands ( California ), the Keys ( Florida ), the barrier islands ( Gulf and East Coast states), and Long Island (New York). CONUS , a technical term used by the U.S. Department of Defense , General Services Administration , NOAA/National Weather Service , and others, has been defined both as
18924-524: The most hurricane-ready structures in the country. In Cuba , meteorologists did not initially predict a direct hit. Fuel conservation was enacted in Camagüey Province to ensure that enough would be available during post-storm power outages. The Civil Defense evacuated nearly one million people from low-lying areas, including thousands of Canadian and European tourists in the Jardines del Rey . Dolphins at
19090-541: The need for transportation by school buses and opening shelters arose. By September 9, more than 150 state parks were closed. Throughout the state, almost 700 emergency shelters were opened. The shelters collectively housed about 191,764 people, with more than 40% of them staying in a shelter in South Florida. Additionally, more than 60 special needs shelters were opened, which housed more than 5,000 people by September 9. Many airports across
19256-489: The north-northwest, while rapid weakening began to occur due to the increasing wind shear, land interaction, and dry air, with the storm falling below Category 3 intensity hours after landfall. Irma finally weakened to a tropical storm on September 11 as it entered southern Georgia , while transitioning into an extratropical cyclone, degenerating into a remnant low early on September 12. The remnants dissipated over Missouri on September 13. Given that Irma's forecast track
19422-650: The northern Leeward Islands . At 05:45 UTC on September 6, Irma made landfall along the northern coast of Barbuda at peak intensity, with the storm's central minimum pressure having bottomed out at 914 mbar (27.0 inHg) – this was the lowest in the Atlantic since Dean in 2007; the storm also made landfall with maximum sustained winds of 180 mph (290 km/h). Irma continued to maintain its peak intensity until 12:00 UTC on September 6 and made additional successive landfalls on that same day, at 11:15 UTC on Sint Maarten , and at 16:30 UTC on Virgin Gorda , in
19588-466: The northern part of the country. The total expanse of the flooding stretched from Môle-Saint-Nicolas in the west to the eastern border with the Dominican Republic. Tropical cyclone A tropical cyclone is a rapidly rotating storm system with a low-pressure center, a closed low-level atmospheric circulation , strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls . Depending on its location and strength,
19754-522: The observed trend of rapid intensification of tropical cyclones in the Atlantic basin. Rapidly intensifying cyclones are hard to forecast and therefore pose additional risk to coastal communities. Warmer air can hold more water vapor: the theoretical maximum water vapor content is given by the Clausius–Clapeyron relation , which yields ≈7% increase in water vapor in the atmosphere per 1 °C (1.8 °F) warming. All models that were assessed in
19920-626: The opposite coast. Fuel was in short supply throughout peninsular Florida during the week before Irma's arrival, especially along evacuation routes, leading to hours-long lines at fuel stations and even escorts of fuel trucks by the Florida Highway Patrol . Use of the left shoulder as a lane for moving traffic was allowed on northbound Interstate 75 from Wildwood to the Georgia state line beginning September 8 and on eastbound Interstate 4 from Tampa to State Road 429 near Celebration for
20086-592: The order to the entirety of Chatham County and low-lying areas west of I-95 on the following day. In total, 540,000 people on the Georgia coast were ordered to leave. Contraflow lane reversal for Interstate 16 took effect on the morning of September 9 from Savannah to Dublin, Georgia . All Georgia state parks were open for free to evacuees, as was the 800-acre camping area at Atlanta Motor Speedway . Reversible HOT lanes on Interstate 75 in Georgia through south metro Atlanta were open 24 hours northbound with no tolls. North Carolina Governor Roy Cooper declared
20252-904: The other from the Florida–Georgia state line to the South Santee River in South Carolina. Watches and warnings were gradually discontinued as Irma moved inland and weakened, with all of them canceled by early on September 12. On September 4, Florida Governor Rick Scott declared a state of emergency. Governor Scott placed 100 members of the Florida National Guard on duty to assist in preparations. All 7,000 troops were ordered to be on duty by September 8. Officials advised residents to stock their hurricane kits. The state coordinated with electrical companies in order for power outages to be restored as quickly as possible, extending resources such as equipment, fuel, and lodging for
20418-466: The overall frequency of tropical cyclones worldwide, with increased frequency in the North Atlantic and central Pacific, and significant decreases in the southern Indian Ocean and western North Pacific. There has been a poleward expansion of the latitude at which the maximum intensity of tropical cyclones occurs, which may be associated with climate change. In the North Pacific, there may also have been an eastward expansion. Between 1949 and 2016, there
20584-447: The part of the population, others "admitted they were not prepared for the onslaught and no mandatory evacuation orders were in place ahead of Irma's approach." Local officials contended that they had not received promised funds, supplies, or equipment from the national government. The United Nations Stabilization Mission in Haiti prepared its 1,000 peacekeepers and engineers to assist. In
20750-440: The potential of spawning tornadoes . Climate change affects tropical cyclones in several ways. Scientists found that climate change can exacerbate the impact of tropical cyclones by increasing their duration, occurrence, and intensity due to the warming of ocean waters and intensification of the water cycle . Tropical cyclones draw in air from a large area and concentrate the water content of that air into precipitation over
20916-413: The presence of moderate or strong wind shear depending on the evolution and structure of the storm's convection. The size of tropical cyclones plays a role in how quickly they intensify. Smaller tropical cyclones are more prone to rapid intensification than larger ones. The Fujiwhara effect , which involves interaction between two tropical cyclones, can weaken and ultimately result in the dissipation of
21082-455: The projected northward turn, but that South Texas or Florida would not be a good evacuation destination. On September 10, Tennessee Governor Bill Haslam issued an executive order allowing medical professionals in other states to practice in Tennessee to aid Hurricane Irma evacuees. This order also allowed pharmacies to give out 14-day supplies of medicine, and gave women and children from outside
21248-444: The release of latent heat from the saturated soil. Orographic lift can cause a significant increase in the intensity of the convection of a tropical cyclone when its eye moves over a mountain, breaking the capped boundary layer that had been restraining it. Jet streams can both enhance and inhibit tropical cyclone intensity by influencing the storm's outflow as well as vertical wind shear. On occasion, tropical cyclones may undergo
21414-492: The same intensity. The passage of a tropical cyclone over the ocean causes the upper layers of the ocean to cool substantially, a process known as upwelling , which can negatively influence subsequent cyclone development. This cooling is primarily caused by wind-driven mixing of cold water from deeper in the ocean with the warm surface waters. This effect results in a negative feedback process that can inhibit further development or lead to weakening. Additional cooling may come in
21580-510: The same lightning strike, but survived. Two other people died during the hurricane: a woman died while being evacuated from her house in a wheelchair and fell, hitting her head; another person died in a car accident in Canóvanas . Governor Ricardo Rosselló declared the islands of Culebra and Vieques to be disaster areas. Although spared a direct hit, both the Dominican Republic and Haiti were affected by high winds and heavy rains. A bridge over
21746-488: The same system. The ASCAT is a scatterometer used by the MetOp satellites to map the wind field vectors of tropical cyclones. The SMAP uses an L-band radiometer channel to determine the wind speeds of tropical cyclones at the ocean surface, and has been shown to be reliable at higher intensities and under heavy rainfall conditions, unlike scatterometer-based and other radiometer-based instruments. The Dvorak technique plays
21912-513: The sea can result in heat being inserted in deeper waters, with potential effects on global climate . Vertical wind shear decreases tropical cyclone predicability, with storms exhibiting wide range of responses in the presence of shear. Wind shear often negatively affects tropical cyclone intensification by displacing moisture and heat from a system's center. Low levels of vertical wind shear are most optimal for strengthening, while stronger wind shear induces weakening. Dry air entraining into
22078-423: The second-longest any Atlantic storm had maintained winds above 156 mph (251 km/h) – behind only the 1932 Cuba hurricane . The hurricane then began tracking more to the west due to the intensification of a subtropical ridge to its north. Once the eyewall replacement cycle was complete, Irma began to re-intensify, and it re-attained Category 5 intensity at 18:00 UTC that day east of Cuba , before
22244-641: The species survive, but most of the birds survived the storm. Barbuda's Codrington Lagoon , home to the largest colony of magnificent frigatebirds in the Caribbean, with an estimated 2,500 nesting pairs, was also inundated by the storm surge. Remaining just outside of Irma's strongest windfield, Antigua sustained less severe damage, in the form of leveled roofs and fences, downed power poles and lines, and uprooted trees. Some street flooding also took place in low-lying areas. Three people were treated for minor storm-related injuries. Forensic disaster analysts from
22410-567: The state the ability to participate in the Tennessee Department of Health programs. Bristol Motor Speedway , Talladega Superspeedway , and Charlotte Motor Speedway all opened their campgrounds to evacuees free of charge. In professional sports, the Miami Dolphins – Tampa Bay Buccaneers game scheduled for September 10 at Hard Rock Stadium in Miami was postponed to November 19 due to
22576-759: The state, particularly in Central and South Florida , were closed. Nearly 9,000 flights intending to arrive in or depart from Florida were canceled. Along Florida's coasts, most seaports were closed or opened with restricted access. For the fifth time in its 45-year history, the Walt Disney World Resort was completely closed due to the storm. Its theme parks, water parks, and Disney Springs were all closed by 9:00 p.m. on September 9 and remained closed until September 12. Other Orlando -area theme parks, including Universal Orlando Resort and SeaWorld Orlando , were also closed. The Kennedy Space Center
22742-672: The storm's threat. The Dolphins left early for their road game against the Los Angeles Chargers . The Tampa Bay Rays and New York Yankees moved their September 11–13 series from Tropicana Field in St. Petersburg to Citi Field in Queens . Minor League Baseball 's Florida State League , Carolina League , and Southern League called off their championship finals and as a result, named their division series winners league co-champions. The Miami FC versus San Francisco Deltas match on September 10
22908-594: The subtropical ridge position, shifts westward across the western Pacific Ocean, which increases the landfall threat to China and much greater intensity in the Philippines . The Atlantic Ocean experiences depressed activity due to increased vertical wind shear across the region during El Niño years. Tropical cyclones are further influenced by the Atlantic Meridional Mode , the Quasi-biennial oscillation and
23074-419: The surface pressure decreases by 2.5 hPa (0.074 inHg) per hour for at least 12 hours or 5 hPa (0.15 inHg) per hour for at least 6 hours. For rapid intensification to occur, several conditions must be in place. Water temperatures must be extremely high, near or above 30 °C (86 °F), and water of this temperature must be sufficiently deep such that waves do not upwell cooler waters to
23240-483: The surface. On the other hand, Tropical Cyclone Heat Potential is one of such non-conventional subsurface oceanographic parameters influencing the cyclone intensity. Wind shear must be low. When wind shear is high, the convection and circulation in the cyclone will be disrupted. Usually, an anticyclone in the upper layers of the troposphere above the storm must be present as well—for extremely low surface pressures to develop, air must be rising very rapidly in
23406-621: The system and its intensity. For example, within the Northern Atlantic and Eastern Pacific basins, a tropical cyclone with wind speeds of over 65 kn (120 km/h; 75 mph) is called a hurricane , while it is called a typhoon or a severe cyclonic storm within the Western Pacific or North Indian oceans. When a hurricane passes west across the International Dateline in the Northern Hemisphere, it becomes known as
23572-655: The term is qualified with the explicit inclusion of Alaska to resolve any ambiguity. On May 14, 1959, the United States Board on Geographic Names issued the following definitions based partially on the reference in the Alaska Omnibus Bill, which defined the continental United States as "the 49 States on the North American Continent and the District of Columbia..." The Board reaffirmed these definitions on May 13, 1999. However, even before Alaska became
23738-576: The terms the Mainland or U.S. Mainland are often used to refer to the 49 states in North America. Puerto Rico is an unincorporated territory of the United States located in the northeast Caribbean Sea , approximately 1,000 miles (1,609 km) southeast of Miami , Florida . Puerto Ricans born in Puerto Rico are U.S. citizens and are free to move to the mainland United States. The term Stateside Puerto Rican refers to residents of any U.S. state or
23904-579: The territory by helicopter, revealing an effectively uninhabitable island. Irma damaged or destroyed 95% of the structures on Barbuda, including its hospital, schools, and both of its hotels; it completely flattened some residential blocks while submerging others. The destruction rendered the island's sole airport and much of its infrastructure inoperative—including water and telecommunication services—which further hampered relief efforts. Property damage on Barbuda ranged from $ 150 million to $ 300 million. A total of three storm-related deaths were reported on
24070-440: The threat of flooding and erosion. Schools and public businesses closed on September 5 and 6. Hospitals stocked up on three days' worth of supplies and checked the functionality of their generators. Of the island's 32 communes , 22 activated their emergency plans; 1,500 people were urged to take shelter. The island sustained relatively minor damage and became the base for relief efforts on Saint Martin and Saint Barthélemy . Though
24236-411: The total area of the United States, including Alaska and Hawaii, ranks third or fourth. Brazil is 431,000 square kilometers (166,000 sq mi) larger than the contiguous United States, but smaller than the entire United States including Alaska, Hawaii and overseas territories. The 2020 U.S. census population of the area was 328,571,074, comprising 99.13 percent of the nation's total population, and
24402-423: The tropical cyclone year begins on July 1 and runs all year-round encompassing the tropical cyclone seasons, which run from November 1 until the end of April, with peaks in mid-February to early March. Of various modes of variability in the climate system, El Niño–Southern Oscillation has the largest effect on tropical cyclone activity. Most tropical cyclones form on the side of the subtropical ridge closer to
24568-516: The use of contiguous or conterminous United States instead of lower 48 when the 48 states are meant, unless used in the context of Alaska. Almost all of Hawaii is south of the southernmost point of the conterminous United States in Florida. During World War II , the first four numbered Air Forces of the United States Army Air Forces (USAAF) were said to be assigned to the Zone of
24734-451: The weaker of two tropical cyclones by reducing the organization of the system's convection and imparting horizontal wind shear. Tropical cyclones typically weaken while situated over a landmass because conditions are often unfavorable as a result of the lack of oceanic forcing. The Brown ocean effect can allow a tropical cyclone to maintain or increase its intensity following landfall , in cases where there has been copious rainfall, through
24900-402: The wind speed of Hurricane Helene by 11%, it increased the destruction from it by more than twice. According to World Weather Attribution the influence of climate change on the rainfall of some latest hurricanes can be described as follows: Tropical cyclone intensity is based on wind speeds and pressure. Relationships between winds and pressure are often used in determining the intensity of
25066-736: The winds had shattered their windows. Irma killed four people on the French side of the island and injured 50 others, one of whom was in critical condition. As many as 95% of the buildings there were damaged to some degree; 60% of those were totally uninhabitable. Estimates from CEDIM indicate a minimum of $ 950 million worth of economic losses. Total losses exceeded €3.5 billion (US$ 4.17 billion). A similar situation unfolded in Sint Maarten , Saint Martin's Dutch half, as intense winds ripped through buildings and lifted vehicles aloft "as if they were matches". The hurricane wreaked havoc on Princess Juliana International Airport , with "huge chunks of
25232-702: The world, over half of which develop hurricane-force winds of 65 kn (120 km/h; 75 mph) or more. Tropical cyclones typically form over large bodies of relatively warm water. They derive their energy through the evaporation of water from the ocean surface, which ultimately condenses into clouds and rain when moist air rises and cools to saturation . This energy source differs from that of mid-latitude cyclonic storms , such as nor'easters and European windstorms , which are powered primarily by horizontal temperature contrasts . Tropical cyclones are typically between 100 and 2,000 km (62 and 1,243 mi) in diameter. The strong rotating winds of
25398-779: Was 185 kn (95 m/s; 345 km/h; 215 mph) in Hurricane Patricia in 2015—the most intense cyclone ever recorded in the Western Hemisphere . Warm sea surface temperatures are required for tropical cyclones to form and strengthen. The commonly-accepted minimum temperature range for this to occur is 26–27 °C (79–81 °F), however, multiple studies have proposed a lower minimum of 25.5 °C (77.9 °F). Higher sea surface temperatures result in faster intensification rates and sometimes even rapid intensification . High ocean heat content , also known as Tropical Cyclone Heat Potential , allows storms to achieve
25564-523: Was a slowdown in tropical cyclone translation speeds. It is unclear still to what extent this can be attributed to climate change: climate models do not all show this feature. A 2021 study review article concluded that the geographic range of tropical cyclones will probably expand poleward in response to climate warming of the Hadley circulation . When hurricane winds speed rise by 5%, its destructive power rise by about 50%. Therfore, as climate change increased
25730-416: Was along much of the Caribbean island chain, hurricane warnings were issued for the northern Leeward Islands, Puerto Rico, and parts of Hispaniola on September 5. In Antigua and Barbuda , residents safeguarded their homes and cleaned up their properties in anticipation of strong winds. Emergency crews were put on standby at public shelters and hospitals by September 5 to assist with any evacuations. Expecting
25896-422: Was also the third-strongest Atlantic hurricane at landfall ever recorded, just behind the 1935 Labor Day Hurricane and Dorian. The ninth named storm , fourth hurricane , second major hurricane , and first Category 5 hurricane of the extremely active 2017 Atlantic hurricane season , Irma caused widespread and catastrophic damage throughout its long lifetime, particularly in the northeastern Caribbean and
26062-520: Was attributed to around $ 1 billion in damage, and the NHC attributed three fatalities to Irma in Puerto Rico, though four deaths were related to the storm. Two people died due to rainstorms ahead of the hurricane: one man died in Orocovis after falling off his ladder while repairing his roof; another man on the coast in Capitanejo died after being struck by lightning. Three nearby fishermen were burned by
26228-725: Was canceled due to travel concerns for the University of Miami. The Florida Gators - Northern Colorado Bears match in Gainesville scheduled for September 9 was canceled. The Florida State Seminoles contest against the Louisiana–Monroe Warhawks was canceled on September 8. The Seminoles' rivalry game with the Hurricanes in Tallahassee, originally scheduled for September 16, was postponed tp October 7. The FIU Panthers game against
26394-680: Was canceled so the players and staff could prepare for the storm with their families. The Orlando Pride of the National Women's Soccer League rescheduled their September 9 match to September 7. Orlando City SC of Major League Soccer did not have any scheduled home games in September, but was unable to return to training facilities in Orlando due to Hurricane Irma. In college football, the UCF Knights - Memphis Tigers game scheduled for September 9
26560-603: Was closed from September 8 to September 15. An estimated 6.5 million Floridians were ordered to evacuate, mostly those living on barrier islands or in coastal areas; in mobile or sub-standard homes; and in low-lying or flood prone areas. Mandatory evacuations were ordered for portions of Brevard , Broward , Citrus , Collier , Dixie , Duval , Flagler , Glades , Hendry , Hernando , Indian River , Lee , Martin , Miami-Dade , Orange , Palm Beach , Pasco , Pinellas , Sarasota , Seminole , St. Lucie , Sumter , and Volusia counties. All of Monroe County , where
26726-418: Was inundated with up to 6.4 ft (2.0 m) of flood waters. With scores of homes and much of the infrastructure destroyed, the majority of the island's population was left stranded and without water, electricity or phone service. The associated economic losses could exceed $ 480 million according to CEDIM's analysts. Preliminary assessments from the French government indicate that Hurricane Irma caused
26892-526: Was moved to September 30, replacing UCF's game against Maine and Memphis game against Georgia State . UCF also canceled their game against Georgia Tech on September 16, as UCF's stadium hosted the National Guard. The USF Bulls - Connecticut Huskies football game was also canceled. The Miami Hurricanes – Arkansas State Redwolves game scheduled for September 9 at Centennial Bank Stadium in Arkansas
27058-504: Was published indicating that an anemometer on the island recorded an unofficial gust to 199 mph (320 km/h) before failing. The British Overseas Territory of Anguilla saw the eyewall of the storm pass over it on September 6. Many homes and schools were destroyed, and the island's only hospital was badly damaged. The devastation was particularly severe in East End , where the winds uprooted scores of trees and power poles and demolished
27224-664: Was reported on the island. Estimates of losses on the island total at least $ 190 million. Large swells ahead of Irma washed ashore debris and sea life in Castries , Saint Lucia, blocking some roads. Seaside roads were inundated with water. One surfer was killed amid rough surf in Barbados after hitting a reef and breaking his neck. Trees were also destroyed. The hurricane's effects, such as violent seas and rattling trees, were intense enough to be detected by seismographs in Guadeloupe . Several houses were damaged. Around 8,000 households and
27390-575: Was revived in the latter part of World War II for the Western Pacific. Formal naming schemes have subsequently been introduced for the North and South Atlantic, Eastern, Central, Western and Southern Pacific basins as well as the Australian region and Indian Ocean. At present, tropical cyclones are officially named by one of twelve meteorological services and retain their names throughout their lifetimes to provide ease of communication between forecasters and
27556-528: Was such that its impact was both far-reaching and devastating, with landfalls in Antigua and Barbuda , Saint Martin , the Bahamas , Cuba , and the United States, all at major hurricane intensity. Furthermore, the size of the storm system meant that destruction was prevalent even in territories well removed from landfall occurrences. Irma is the second-costliest Caribbean hurricane on record, after Maria. The eyewall of
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