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72-538: 51°33′S 72°36′W  /  51.550°S 72.600°W  / -51.550; -72.600 This Magallanes and Antártica Chilena Region location article is a stub . You can help Misplaced Pages by expanding it . This article related to a mountain , mountain range , or peak in Chile is a stub . You can help Misplaced Pages by expanding it . Magallanes and Ant%C3%A1rtica Chilena Region The Magallanes Region ( locally [maɣaˈʝanes] ), officially

144-462: A category 5 hurricane . In the Arctic , the average pressure for cyclones is 980 millibars (28.94 inHg) during the winter, and 1,000 millibars (29.53 inHg) during the summer. Tropical cyclones often transform into extratropical cyclones at the end of their tropical existence, usually between 30° and 40° latitude, where there is sufficient forcing from upper-level troughs or shortwaves riding

216-477: A tundra climate prevails. These islands are strongly influenced by the surrounding Pacific Ocean to the west and southwest and the Drake Passage to the south, resulting in constant temperatures throughout the year. Mean annual temperatures are between 5 and 7 °C (41.0 and 44.6 °F) while precipitation is high, with most places receiving 1,000 mm (39 in). In sheltered areas, precipitation

288-454: A cyclone occludes, a tr ough o f w arm air al oft—or "trowal" for short—will be caused by strong southerly winds on its eastern periphery rotating aloft around its northeast, and ultimately into its northwestern periphery (also known as the warm conveyor belt), forcing a surface trough to continue into the cold sector on a similar curve to the occluded front. The trowal creates the portion of an occluded cyclone known as its comma head , due to

360-406: A definitive lower to mid-level warm core structure. A warm seclusion, the result of a baroclinic lifecycle, occurs at latitudes well poleward of the tropics. As latent heat flux releases are important for their development and intensification, most warm seclusion events occur over the oceans ; they may impact coastal nations with hurricane force winds and torrential rain . Climatologically,

432-415: A favorable quadrant of a maximum in the upper level jetstream known as a jet streak. The favorable quadrants are usually at the right rear and left front quadrants, where divergence ensues. The divergence causes air to rush out from the top of the air column. As mass in the column is reduced, atmospheric pressure at surface level (the weight of the air column) is reduced. The lowered pressure strengthens

504-413: A frontal boundary, eventually occluding and reaching a barotropically cold environment. It was developed completely from surface-based weather observations, including descriptions of clouds found near frontal boundaries. This theory still retains merit, as it is a good description for extratropical cyclones over continental landmasses. A second competing theory for extratropical cyclone development over

576-471: A highest recorded wind of 220 km/h (140 mph), resulting in the loss of 19 lives, 15 million trees, widespread damage to homes and an estimated economic cost of £ 1.2 billion ( US$ 2.3 billion). Although most tropical cyclones that become extratropical quickly dissipate or are absorbed by another weather system, they can still retain winds of hurricane or gale force. In 1954, Hurricane Hazel became extratropical over North Carolina as

648-636: A nor'easter caused at least 286 deaths in the Northeastern United States, one of the deadliest nor'easters on record. 62 years later in 2022 , a winter storm caused $ 8.5 billion in damages and 106 deaths across the United States and Canada. In September 1954, the extratropical remnants of Typhoon Marie caused the Tōya Maru to run aground and capsize in the Tsugaru Strait . 1,159 out of

720-622: A pressure of 915 mbar (27.0 inHg), with the possibility of a pressure between 912–913 mbar (26.9–27.0 inHg), lower than the Braer Storm. The most intense extratropical cyclone across the North Pacific Ocean occurred in November 2014, when a cyclone partially related to Typhoon Nuri reached a record low pressure of 920 mbar (27 inHg). In October 2021, the most intense Pacific Northwest windstorm occurred off

792-522: A strong Category 3 storm. The Columbus Day Storm of 1962 , which evolved from the remains of Typhoon Freda, caused heavy damage in Oregon and Washington , with widespread damage equivalent to at least a Category 3. In 2005, Hurricane Wilma began to lose tropical characteristics while still sporting Category 3-force winds (and became fully extratropical as a Category 1 storm). In summer, extratropical cyclones are generally weak, but some of

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864-527: A strong baroclinic system and achieved warm seclusion status at maturity (or lowest pressure). Extratropical cyclones are generally driven, or "steered", by deep westerly winds in a general west to east motion across both the Northern and Southern hemispheres of the Earth. This general motion of atmospheric flow is known as "zonal". Where this general trend is the main steering influence of an extratropical cyclone, it

936-513: A tropical cyclone has intruded into the mid latitudes. Weather forecasters and the general public often describe them simply as " depressions " or "lows". Terms like frontal cyclone, frontal depression, frontal low, extratropical low, non-tropical low and hybrid low are often used as well. Extratropical cyclones are classified mainly as baroclinic , because they form along zones of temperature and dewpoint gradient known as frontal zones . They can become barotropic late in their life cycle, when

1008-464: A tropical cyclone. The Joint Typhoon Warning Center uses the extratropical transition (XT) technique to subjectively estimate the intensity of tropical cyclones becoming extratropical based on visible and infrared satellite imagery . Loss of central convection in transitioning tropical cyclones can cause the Dvorak technique to fail; the loss of convection results in unrealistically low estimates using

1080-472: A university centre in Puerto Williams . University of Magellan publishes the humanities and social sciences journal Magallania twice a year. [REDACTED] Media related to Category:Magallanes y Antártica Chilena Region at Wikimedia Commons Extratropical cyclone Extratropical cyclones , sometimes called mid-latitude cyclones or wave cyclones , are low-pressure areas which, along with

1152-658: Is a university in the southern Chilean city of Punta Arenas. It is part of the Chilean Traditional Universities . The University of Magellan was established in 1981 during the economic reforms of Chile's military regime as the successor of Universidad Técnica del Estado 's Punta Arenas section. Universidad Técnica del Estado had established the Punta Arenas section in 1961. The University of Magellan have campuses in Punta Arenas and Puerto Natales as well as

1224-586: Is also the region with the lowest poverty level in Chile (5.8%); households in Magallanes have the highest income of any region in Chile. Since 2017, the region has had its own time zone . It uses the summer time for the whole year (UTC−3). The region contains mountainous peaks and glaciers in the far north, including elements of the Patagonian Ice Sheet . Further south there are other mountain ranges such as

1296-427: Is associated with the warm front is often extensive. In mature extratropical cyclones, an area known as the comma head on the northwest periphery of the surface low can be a region of heavy precipitation, frequent thunderstorms , and thundersnows . Cyclones tend to move along a predictable path at a moderate rate of progress. During fall , winter, and spring, the atmosphere over continents can be cold enough through

1368-660: Is at about 10,000 feet (3,048 meters) altitude. Cyclone phase diagrams are used to tell whether a cyclone is tropical, subtropical, or extratropical. There are two models of cyclone development and life cycles in common use: the Norwegian model and the Shapiro–Keyser model. Of the two theories on extratropical cyclone structure and life cycle, the older is the Norwegian Cyclone Model, developed during World War I . In this theory, cyclones develop as they move up and along

1440-421: Is below 600 mm (24 in). Summers are the warmest and the wettest season in these islands. The population of Magallanes is one of the lowest in Chile, as one of the last regions colonized. In the 1854 census counted 158 settlers, concentrated in Punta Arenas. The native population in 1830, according to King, amounted to approximately 2,200, with about 400 in western Patagonia and approximately 1,600 in

1512-406: Is best. The stronger the upper level divergence over the cyclone, the deeper the cyclone can become. Hurricane-force extratropical cyclones are most likely to form in the northern Atlantic and northern Pacific oceans in the months of December and January. On 14 and 15 December 1986, an extratropical cyclone near Iceland deepened to below 920 millibars (27 inHg), which is a pressure equivalent to

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1584-446: Is fairly evenly distributed through the year. During winters, precipitation mainly falls as snow . Mean annual temperatures are between 6 and 7 °C (42.8 and 44.6 °F). Due to the close proximity to the ocean, winters are not cold and snow cover does not last long. In the easternmost parts of the region, including much of Tierra del Fuego province , a cold steppe climate prevails. Temperatures are cold while precipitation

1656-560: Is known as a " zonal flow regime ". When the general flow pattern buckles from a zonal pattern to the meridional pattern, a slower movement in a north or southward direction is more likely. Meridional flow patterns feature strong, amplified troughs and ridges, generally with more northerly and southerly flow. Changes in direction of this nature are most commonly observed as a result of a cyclone's interaction with other low pressure systems , troughs , ridges , or with anticyclones . A strong and stationary anticyclone can effectively block

1728-470: Is known as the cold sector, while the area equatorward and east of its associated cold and warm fronts is known as the warm sector. The wind flow around an extratropical cyclone is counterclockwise in the northern hemisphere, and clockwise in the southern hemisphere, due to the Coriolis effect (this manner of rotation is generally referred to as cyclonic ). Near this center, the pressure gradient force (from

1800-428: Is lower than areas to the west. Mean precipitation is between 250 and 500 mm (9.8 and 19.7 in), decreasing eastwards and is fairly evenly distributed throughout the year. Mean annual temperatures range between 8 and 9 °C (46.4 and 48.2 °F). From December to March, mean temperatures exceed 10 °C (50.0 °F) while during winter, they reach down to 2 °C (35.6 °F). Corresponding to

1872-431: Is no longer used. The windfield of an extratropical cyclone constricts with distance in relation to surface level pressure, with the lowest pressure being found near the center, and the highest winds typically just on the cold/poleward side of warm fronts, occlusions, and cold fronts , where the pressure gradient force is highest. The area poleward and west of the cold and warm fronts connected to extratropical cyclones

1944-572: Is possible. Although tornadoes can form anywhere on Earth, the greatest number occur in the Great Plains in the United States, because downsloped winds off the north–south oriented Rocky Mountains , which can form a dry line, aid their development at any strength . Explosive development of extratropical cyclones can be sudden. The storm known in Great Britain and Ireland as the " Great Storm of 1987 " deepened to 953 millibars (28.14 inHg) with

2016-522: The Bergen School of Meteorology , largely observed cyclones at the tail end of their lifecycle and used the term occlusion to identify the decaying stages. Warm seclusions may have cloud-free, eye -like features at their center (reminiscent of tropical cyclones ), significant pressure falls, hurricane-force winds, and moderate to strong convection . The most intense warm seclusions often attain pressures less than 950 millibars (28.05 inHg) with

2088-674: The Cerro Toro and numerous surface waters including the Seno Última Esperanza , Eberhard Fjord and Lago Grey . Protected areas include the Torres del Paine National Park and the Cueva del Milodon Natural Monument . At the latter, remains have been discovered of the extinct ground sloth as well as of prehistoric man dating to circa 10,000 BC . The topography can be divided in four regions: an outer archipelago region ( Spanish : Región Archipielágica ) to

2160-527: The Magallanes y la Antártica Chilena Region ( Spanish : Región de Magallanes y de la Antártica Chilena ), is one of Chile 's 16 first order administrative divisions . It is the southernmost, largest, and second least populated region of Chile . It comprises four provinces : Última Esperanza , Magallanes , Tierra del Fuego , and Antártica Chilena . Magallanes's geographical features include Torres del Paine , Cape Horn , Tierra del Fuego island, and

2232-982: The Northern Hemisphere and 71,289–74,229 extratropical cyclones in the Southern Hemisphere were detected between 1979 and 2018 based on reanalysis data. A study of extratropical cyclones in the Southern Hemisphere shows that between the 30th and 70th parallels , there are an average of 37 cyclones in existence during any 6-hour period. A separate study in the Northern Hemisphere suggests that approximately 234 significant extratropical cyclones form each winter. Extratropical cyclones form along linear bands of temperature/dew point gradient with significant vertical wind shear , and are thus classified as baroclinic cyclones. Initially, cyclogenesis , or low pressure formation, occurs along frontal zones near

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2304-543: The Southern Patagonian Ice Field , located at higher altitudes, temperatures are cold enough to maintain permanent ice fields. Mean temperatures are below 0 °C (32.0 °F) in all months while precipitation (mostly as snow) is abundant year-round, receiving 2,000 mm (79 in). These areas have a polar climate . In the southernmost islands, south of Tierra del Fuego and the Strait of Magellan ,

2376-484: The Strait of Magellan . It also includes the Antarctic territory claimed by Chile . Despite its large area, much of the land in the region is rugged or closed off for sheep farming , and is unsuitable for settlement. 80% of the population lives in the capital Punta Arenas , a major market city and one of the main hubs for Antarctic exploration. The main economic activities are sheep farming, oil extraction, and tourism. It

2448-457: The Westerlies for the process of extratropical transition to begin. During this process, a cyclone in extratropical transition (known across the eastern North Pacific and North Atlantic oceans as the post-tropical stage), will invariably form or connect with nearby fronts and/or troughs consistent with a baroclinic system. Due to this, the size of the system will usually appear to increase, while

2520-557: The anticyclones of high-pressure areas , drive the weather over much of the Earth. Extratropical cyclones are capable of producing anything from cloudiness and mild showers to severe hail , thunderstorms , blizzards , and tornadoes . These types of cyclones are defined as large scale (synoptic) low pressure weather systems that occur in the middle latitudes of the Earth. In contrast with tropical cyclones , extratropical cyclones produce rapid changes in temperature and dew point along broad lines, called weather fronts , about

2592-410: The comma -like shape of the mid-tropospheric cloudiness that accompanies the feature. It can also be the focus of locally heavy precipitation, with thunderstorms possible if the atmosphere along the trowal is unstable enough for convection. Extratropical cyclones slant back into colder air masses and strengthen with height, sometimes exceeding 30,000 feet (approximately 9 km) in depth. Above

2664-468: The sea surface temperature is the greatest, leading to the greatest potential for instability. On rare occasions, an extratropical cyclone can transform into a tropical cyclone if it reaches an area of ocean with warmer waters and an environment with less vertical wind shear. An example of this happening is in the 1991 Perfect Storm . The process known as "tropical transition" involves the usually slow development of an extratropically cold core vortex into

2736-494: The Dvorak scale and is applied in the same way, except that "XT" is used instead of "T" to indicate that the system is undergoing extratropical transition. Also, the XT technique is only used once extratropical transition begins; the Dvorak technique is still used if the system begins dissipating without transition. Once the cyclone has completed transition and become cold-core , the technique

2808-465: The Dvorak technique. The system combines aspects of the Dvorak technique, used for estimating tropical cyclone intensity, and the Hebert-Poteat technique, used for estimating subtropical cyclone intensity. The technique is applied when a tropical cyclone interacts with a frontal boundary or loses its central convection while maintaining its forward speed or accelerating. The XT scale corresponds to

2880-506: The Northern Hemisphere sees warm seclusions during the cold season months, while the Southern Hemisphere may see a strong cyclone event such as this during all times of the year. In all tropical basins, except the Northern Indian Ocean, the extratropical transition of a tropical cyclone may result in reintensification into a warm seclusion. For example, Hurricane Maria (2005) and Hurricane Cristobal (2014) each re-intensified into

2952-675: The Southern Ocean with a pressure under 915 mbar (27.0 inHg). In the North Atlantic Ocean, the most intense extratropical cyclone was the Braer Storm , which reached a pressure of 914 mbar (27.0 inHg) in early January 1993. Before the Braer Storm, an extratropical cyclone near Greenland in December 1986 reached a minimum pressure of at least 916 mbar (27.0 inHg). The West German Meteorological Service marked

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3024-436: The atmosphere), the two may combine to become a binary cyclone, where the vortices of the two cyclones rotate around each other (known as the " Fujiwhara effect "). This most often results in a merging of the two low pressure systems into a single extratropical cyclone, or can less commonly result in a mere change of direction of either one or both of the cyclones. The precise results of such interactions depend on factors such as

3096-664: The bulk of the regional population in the city of Punta Arenas, and in the provincial capitals Puerto Natales , Porvenir (Spanish for "future") and Puerto Williams , one of the world's southernmost cities. In the past 50 years, the population has increased moderately as shown below, but the region still has one of the lowest population densities in the country. The population remains mostly urban and concentrated in Punta Arenas. Census The most populated cities (2002 census) are Punta Arenas (116,005 inhabitants), Puerto Natales (16,978) Porvenir (4,734), Puerto Williams (1,952), and Cerro Sombrero (687). University of Magellan ( UMAG )

3168-423: The center of the cyclone. The term " cyclone " applies to numerous types of low pressure areas, one of which is the extratropical cyclone. The descriptor extratropical signifies that this type of cyclone generally occurs outside the tropics and in the middle latitudes of Earth between 30° and 60° latitude. They are termed mid-latitude cyclones if they form within those latitudes, or post-tropical cyclones if

3240-764: The coast of Oregon , peaking with a pressure of 942 mbar (27.8 inHg). One of the strongest nor'easters occurred in January 2018 , in which a cyclone reached a pressure of 950 mbar (28 inHg). Extratropical cyclones have been responsible for some of the most damaging floods in European history. The Great storm of 1703 killed over 8,000 people and the North Sea flood of 1953 killed over 2,500 and destroyed 3,000 houses. In 2002, floods in Europe caused by two genoa lows caused $ 27.115 billion in damages and 232 fatalities,

3312-419: The cooler air ahead of the system is denser , and therefore more difficult to dislodge. Later, the cyclones occlude as the poleward portion of the cold front overtakes a section of the warm front, forcing a tongue, or trowal , of warm air aloft. Eventually, the cyclone will become barotropically cold and begin to weaken. Atmospheric pressure can fall very rapidly when there are strong upper level forces on

3384-413: The core weakens. However, after transition is complete, the storm may re-strengthen due to baroclinic energy, depending on the environmental conditions surrounding the system. The cyclone will also distort in shape, becoming less symmetric with time. During extratropical transition, the cyclone begins to tilt back into the colder airmass with height, and the cyclone's primary energy source converts from

3456-422: The cyclone (a low pressure system). The lowered pressure acts to draw in air, creating convergence in the low-level wind field. Low-level convergence and upper-level divergence imply upward motion within the column, making cyclones cloudy. As the cyclone strengthens, the cold front sweeps towards the equator and moves around the back of the cyclone. Meanwhile, its associated warm front progresses more slowly, as

3528-439: The depth of the troposphere to cause snowfall. Squall lines, or solid bands of strong thunderstorms, can form ahead of cold fronts and lee troughs due to the presence of significant atmospheric moisture and strong upper level divergence, leading to hail and high winds. When significant directional wind shear exists in the atmosphere ahead of a cold front in the presence of a strong upper-level jet stream, tornado formation

3600-400: The distribution of heat around the cyclone becomes fairly uniform with its radius. Extratropical cyclones form anywhere within the extratropical regions of the Earth (usually between 30° and 60° latitude from the equator ), either through cyclogenesis or extratropical transition. In a climatology study with two different cyclone algorithms, a total of 49,745–72,931 extratropical cyclones in

3672-421: The diversity in altitudes and the width of the region. Owing to its proximity to 60°S (a zone characterized by low pressure systems and subpolar cyclones ), frontal systems regularly pass through the region. The westernmost islands have a cold, humid and rainy climate, being exposed to strong winds and low temperatures throughout the year. Precipitation averages 3,500 mm (140 in) per year, while

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3744-472: The higher latitudes). The existence of such transients are also closely related to the formation of the Icelandic and Aleutian Low — the two most prominent general circulation features in the mid- to sub-polar northern latitudes. The two lows are formed by both the transport of kinetic energy and the latent heating (the energy released when water phase changed from vapor to liquid during precipitation) from

3816-927: The late 18th century to the opening of the Panama Canal in 1914, thousands of trans-oceanic voyages stopped by Punta Arenas as the most convenient strait between the Atlantic and Pacific oceans. The settlement of Punta Arenas and the Magellan and Chilean Antarctica Region is a result of its historic use as a hub for international travel. In the 1907 census, the Territory of Magellan had 17,330 inhabitants, distributed as follows: – City of Punta Arenas: 12,785 hab. – Patagonia Chilena: 1,094 hab. – Pen. of Brunswick: 1,062 hab. – Tierra del Fuego: 1,626 hab. – Beagle Channel: 184 inhabitants. – Last Hope: 392 inhabitants. – Baker River: 187 inhabitants. This proportional distribution has persisted, with

3888-415: The mean annual temperature on these islands is 9 °C (48.2 °F) with a low thermal amplitude due to the maritime influences and the strong winds. Precipitation decreases and temperatures increase moving eastwards. These islands are the wettest places in Chile, particularly on Guarello Island where it can record 9,000 mm (350 in) during the wettest years. Precipitation is high throughout

3960-733: The mid- latitude cyclones. The most intense extratropical cyclone on record was a cyclone in the Southern Ocean in October 2022. An analysis by the European Centre for Medium-Range Weather Forecasts estimated a pressure of 900.7 mbar (26.60 inHg) and a subsequent analysis published in Geophysical Research Letters estimated a pressure of 899.91 mbar (26.574 inHg). The same Geophysical Research Letters article notes at least five other extratropical cyclones in

4032-562: The most damaging flood in European since at least 1985. In late December 1999, Cyclones Lothar and Martin caused 140 deaths combined and over $ 23 billion in damages in Central Europe, the costliest European windstorms in history. In October 2012, Hurricane Sandy transitioned into an extratropical cyclone off the coast of the Northeastern United States . The storm killed over 100 people and caused $ 65 billion in damages,

4104-467: The oceans is the Shapiro–Keyser model, developed in 1990. Its main differences with the Norwegian Cyclone Model are the fracture of the cold front, treating warm-type occlusions and warm fronts as the same, and allowing the cold front to progress through the warm sector perpendicular to the warm front. This model was based on oceanic cyclones and their frontal structure, as seen in surface observations and in previous projects which used aircraft to determine

4176-456: The part of the cold front ahead of the cyclone will develop into a warm front, giving the frontal zone (as drawn on surface weather maps ) a wave-like shape. Due to their appearance on satellite images, extratropical cyclones can also be referred to as frontal waves early in their life cycle. In the United States , an old name for such a system is "warm wave". In the northern hemisphere, once

4248-572: The path of an extratropical cyclone. Such blocking patterns are quite normal, and will generally result in a weakening of the cyclone, the weakening of the anticyclone, a diversion of the cyclone towards the anticyclone's periphery, or a combination of all three to some extent depending on the precise conditions. It is also common for an extratropical cyclone to strengthen as the blocking anticyclone or ridge weakens in these circumstances. Where an extratropical cyclone encounters another extratropical cyclone (or almost any other kind of cyclonic vortex in

4320-466: The pressure at the center of the cyclone compared to the pressure outside the cyclone) and the Coriolis force must be in an approximate balance for the cyclone to avoid collapsing in on itself as a result of the difference in pressure. The central pressure of the cyclone will lower with increasing maturity, while outside of the cyclone, the sea-level pressure is about average. In most extratropical cyclones,

4392-430: The region. Punta Arenas is said to have the largest percentage of Croatians in the world outside Croatia and the former Yugoslavia; Punta Arenas also has the largest percentage of residents of British descent in the whole Chile. There is a higher proportion of non-Spanish Europeans there as well (esp. Scots and Greeks), and descendants of Germans, Dutch, Danes and other Scandinavians, Russians and Portuguese peoples. From

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4464-468: The release of latent heat from condensation (from thunderstorms near the center) to baroclinic processes. The low pressure system eventually loses its warm core and becomes a cold-core system . The peak time of subtropical cyclogenesis (the midpoint of this transition) in the North Atlantic is in the months of September and October, when the difference between the temperature of the air aloft and

4536-485: The second costliest tropical cyclone at the time. Other extratropical cyclones have been related to major tornado outbreaks . The tornado outbreaks of April 1965 , April 1974 and April 2011 were all large, violent, and deadly tornado outbreaks related to extratropical cyclones. Similarly, winter storms in March 1888 , November 1950 and March 1993 were responsible for over 300 deaths each. In December 1960

4608-431: The size of the two cyclones, their strength, their distance from each other, and the prevailing atmospheric conditions around them. Extratropical cyclones can bring little rain and surface winds of 15–30 km/h (10–20 mph), or they can be dangerous with torrential rain and winds exceeding 119 km/h (74 mph), and so they are sometimes referred to as windstorms in Europe. The band of precipitation that

4680-410: The southern Straits. The census of 1875 recorded 1,144 inhabitants and in 1895 the population had risen to 5,170 inhabitants, mostly concentrated in the city of Punta Arenas and its surroundings. The installation of the cattle ranches attracted people from Europe (mostly Croats, British, Swiss and Italians) and southern Chile (mostly from Chiloé Archipelago ), which greatly increased the population of

4752-441: The surface of the earth, the air temperature near the center of the cyclone is increasingly colder than the surrounding environment. These characteristics are the direct opposite of those found in their counterparts, tropical cyclones ; thus, they are sometimes called "cold-core lows". Various charts can be examined to check the characteristics of a cold-core system with height, such as the 700 millibars (20.67 inHg) chart, which

4824-493: The system. When pressures fall more than 1 millibar (0.030  inHg ) per hour, the process is called explosive cyclogenesis, and the cyclone can be described as a bomb . These bombs rapidly drop in pressure to below 980 millibars (28.94 inHg) under favorable conditions such as near a natural temperature gradient like the Gulf Stream , or at a preferred quadrant of an upper-level jet streak, where upper level divergence

4896-502: The systems can cause significant floods overland because of torrential rainfall. The July 2016 North China cyclone never brought gale -force sustained winds, but it caused devastating floods in mainland China , resulting in at least 184 deaths and ¥ 33.19 billion ( US$ 4.96 billion) of damage. An emerging topic is the co-occurrence of wind and precipitation extremes, so-called compound extreme events, induced by extratropical cyclones. Such compound events account for 3–5% of

4968-456: The total number of cyclones. In the classic analysis by Edward Lorenz (the Lorenz energy cycle ), extratropical cyclones (so-called atmospheric transients) acts as a mechanism in converting potential energy that is created by pole to equator temperature gradients to eddy kinetic energy. In the process, the pole-equator temperature gradient is reduced (i.e. energy is transported poleward to warm up

5040-550: The vertical structure of fronts across the northwest Atlantic. A warm seclusion is the mature phase of the extratropical cyclone life cycle. This was conceptualized after the ERICA field experiment of the late 1980s, which produced observations of intense marine cyclones that indicated an anomalously warm low-level thermal structure, secluded (or surrounded) by a bent-back warm front and a coincident chevron-shaped band of intense surface winds. The Norwegian Cyclone Model , as developed by

5112-427: The west and south, a mountain region in the west and south ( Spanish : Región Cordillerana ), a plains region ( Spanish : Región de las Planicies Orientales ) in the northeast plus a sub-Andean zone in-between the last two zones ( Spanish : Región Sub-Andina Oriental ). The region is characterized by low temperatures and strong winds throughout the year. The region has five different climatic types, owing to

5184-613: The year though fall tends to be the wettest season. Immediately to the east of the westernmost islands, east of the Andes and bordered by the Cordillera Paine to the north and the Brunswick Peninsula to the south, the climate is much drier. The Andes to the west block most of the precipitation, causing most of the air coming in to be dry. Mean annual precipitation ranges between 250 and 400 mm (9.8 and 15.7 in) which

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