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161-801: The Black Hills Flood of 1972 , also known as the Rapid City Flood , was the most detrimental flood in South Dakota history, and one of the deadliest floods in U.S. history. The flood took place on June 9–10, 1972 in the Black Hills of Western South Dakota. 15 inches (380 mm) of rain in a small area over the Black Hills caused Rapid Creek and other waterways to overflow. Severe flooding of residential and commercial properties in Rapid City occurred when Canyon Lake Dam became clogged with debris and failed in
322-429: A continental climate with four distinct seasons, ranging from cold, dry winters to warm and semi-humid summers. During the summers, the state's average high temperature is often close to 90 °F (32 °C), although it cools to near 60 °F (16 °C) at night. It is not unusual for South Dakota to have severe hot, dry spells in the summer with the temperature climbing above 100 °F (38 °C) several times
483-738: A tornado emergency may be issued in such cases if the tornado is expected to track into a densely populated area). PDS warnings for other alerts occur with even less frequency, and their criteria varies depending on the alert type to which the wording is applied. Until September 30, 2007, local offices of the National Weather Service issued warnings for severe thunderstorms, tornadoes, flash flooding and marine hazards using geopolitical boundaries. The implementation of storm-based warnings on October 1, 2007, saw alerts for these meteorological or hydrological threats be delineated by polygonal shapes in map-based weather hazard products, which outline
644-517: A collection of national and regional centers, and 122 local Weather Forecast Offices (WFOs). As the NWS is an agency of the U.S. federal government, most of its products are in the public domain and available free of charge. Calls for the creation of a government weather bureau began as early as 1844, when the electrical telegraph was introduced. In 1869, Cleveland Abbe began developing probabilistic forecasts using daily weather data sent via telegraph by
805-457: A continuing basis. Canyon Lake Dam and most bridges were redesigned to prevent debris clogs during flooding. Victims lost precious memories as stated in the Rapid City newspaper. An excerpt from the newspaper reads, "Operation Family Treasure' may provide hope for people.' For those who have given up all hope about finding a priceless photo album or sheet of important personal papers there may be
966-417: A forecast period covering up to seven days, is issued by local WFOs daily, with updates as needed. The forecasts contain weather information relevant to fire control and smoke management for the next 12 to 48 hours, such as wind direction and speed, and precipitation. The appropriate crews use this information to plan for staffing and equipment levels, the ability to conduct scheduled controlled burns, and assess
1127-514: A happy ending with "Operation Family Treasure," a clearing house for irreplaceable items run by the Rapid City Jaycees in conjunction with the Office of Civil defense. Flood disaster victims advised on tax breaks." Eldon L. Smith , a South Dakota state senator , was a victim of the flood. 2012 saw the 40 year anniversary of the fateful flood. Survivors remarked on the horrific events. Rita, who
1288-514: A national rate of 12.8%. The effect of rural flight has not been spread evenly through South Dakota, however. Although most rural counties and small towns have lost population, the Sioux Falls area, the larger counties along Interstate 29 , the Black Hills, and many Indian reservations have all gained population. As the reservations have exercised more sovereignty, some Sioux have returned to them from urban areas. Lincoln County near Sioux Falls
1449-402: A notification of significant weather for which no type of alert is currently in effect for a given location or is expected to be in effect. In situations where a forecaster indicates a significant threat of extremely severe and life-threatening weather with an ongoing local weather event, enhanced wording may be used to note the heightened threat by a significant local storm event. In April 2012,
1610-537: A number of Indian wars , ending with the Wounded Knee Massacre in 1890. As the southern part of the former Dakota Territory , South Dakota became a state on November 2, 1889, simultaneously with North Dakota . They are the 39th and 40th states admitted to the union; President Benjamin Harrison shuffled the statehood papers before signing them so that no one could tell which became a state first. Key events in
1771-481: A public weather forecast, a TAF only addresses weather elements critical to aviation; these include wind, visibility , cloud cover and wind shear . Twenty-one NWS Center Weather Service Units (CWSU) are collocated with the Federal Aviation Administration (FAA) Air Route Traffic Control Centers (ARTCC) . Their main responsibility is to provide up-to-the-minute weather information and briefings to
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#17328766150181932-439: A rural lifestyle, South Dakota has recently sought to diversify its economy in other areas to both attract and retain residents. South Dakota's history and rural character still strongly influence the state's culture. Humans have lived in what is today South Dakota for several thousand years. The first inhabitants were Paleoindian hunter-gatherers, and disappeared from the area around 5000 BC. Between 500 AD and 800 AD,
2093-744: A semi-nomadic people known as the Mound Builders lived in central and eastern South Dakota. In the 14th century, the Crow Creek Massacre occurred, in which several hundred men, women, and children were killed near the Missouri River . By 1500, the Arikara (or Ree) had settled in much of the Missouri River valley. European contact with the area began in 1743, when the LaVérendrye brothers explored
2254-546: A special format known as the "ships synoptic code", and transmitted in real-time to the NWS. They are then distributed on national and international circuits for use by meteorologists in weather forecasting, by oceanographers, ship routing services, fishermen, and many others. The observations are then forwarded for use by the National Climatic Data Center (NCDC) in Asheville, North Carolina . Upper air weather data
2415-454: A state dominated by agriculture to one with a more diversified economy. The tourism industry has grown considerably since the mid-twentieth century, with the Black Hills becoming more important as a destination. The financial service industry began to grow in the state as well, with Citibank moving its credit card operations from New York to Sioux Falls in 1981, a move that has been followed by several other financial companies. South Dakota
2576-582: A tag requesting Emergency Alert System activation to trigger public alert messages via television, radio stations, NOAA Weather Radio, and smartphone apps and messaging services. For local storm events, the warning or advisory product also outlines a meteorological summary of the most recent storm location or local storm report issued prior to the product's issuance (including the approximate area in statute miles and estimated speed and direction), associated hazards, impacts, municipalities and designated land areas (and, if applicable, highway mile markers) covered by
2737-504: A viable threat of severe weather, in which case, the storm-based warning may take on a trapezoidal representation in map-based watch products) or canceled before their set time of expiration by local NWS offices. The NWS also releases Experimental Severe Weather Impact products for use on social media accounts maintained by local forecast offices as well as the Enhanced Data Display (EDD), an experimental pilot project created by
2898-642: A week to seasons, extending into the future as far as technically feasible, and cover the land, the ocean and the atmosphere, extending into the stratosphere. Most of the products issued by the center cover the Contiguous U.S. and Alaska . Additionally, Weather Forecast Offices issue daily and monthly climate reports for official climate stations within their area of responsibility. These generally include recorded highs, lows and other information (including historical temperature extremes, fifty-year temperature and precipitation averages, and degree days ). This information
3059-498: A year. Winters are cold with January high temperatures averaging below freezing and low temperatures averaging below 10 °F (−12 °C) in most of the state. The highest recorded temperature is 120 °F (49 °C) at Usta on July 15, 2006 and the lowest recorded temperature is −58 °F (−50 °C) at McIntosh on February 17, 1936. Average annual precipitation in South Dakota ranges from semi-arid conditions in
3220-472: Is a system designed to provide the emergency management community with access to a set of NWS warnings, watches, forecasts and other products at no recurring cost. It can receive data via radio, internet, or a dedicated satellite dish , depending on the needs and capabilities of the user. NOAAPORT is a one-way broadcast communication system which provides NOAA environmental data and information in near real-time to NOAA and external users. This broadcast service
3381-534: Is also passed on to the Emergency Alert System (EAS). In the aftermath of the 1972 flood, short-term and long-term programs were put into effect. Many businesses were permitted to stay in the flood plain , but houses and motels were either raised or moved due to the likelihood that a flood would occur while a person may be sleeping. The majority of the flood plain was made into large parks, which have increased in number and have been improved and updated on
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#17328766150183542-744: Is an aviation weather warning for thunderstorms, icing, turbulence, and low cloud ceilings and visibilities. The Meteorological Impact Statement (MIS) is a two- to 12-hour forecast that outlines weather conditions expected to impact ARTCC operations. The Aviation Weather Center (AWC), located in Kansas City, Missouri , is a central aviation support facility operated by the National Weather Service, which issues two primary products: The Storm Prediction Center (SPC) in Norman, Oklahoma issues severe thunderstorm and tornado watches in cooperation with local WFOs which are responsible for delineating jurisdictions affected by
3703-452: Is another privately owned attraction in the Black Hills. It is a working paleontological dig and has one of the world's largest concentrations of mammoth remains. At the 2022 estimate South Dakota's population was 909,824 on July 1, 2022, a 2.61% increase since the 2020 United States census . In 2020, 6.5% of South Dakota's population was reported as under 5, 24.5% under 18, and 17.7% were 65 or older. Females made up approximately 49.7% of
3864-540: Is built on the framework. In 2016, the NWS significantly increased the computational power of its supercomputers, spending $ 44 million on two new supercomputers from Cray and IBM . This was driven by relatively lower accuracy of NWS' Global Forecast System (GFS) numerical weather prediction model, compared to other global weather models. This was most notable in the GFS model incorrectly predicting Hurricane Sandy turning out to sea until four days before landfall; while
4025-764: Is considered preliminary until certified by the National Climatic Data Center . The primary network of surface weather observation stations in the United States is composed of Automated Surface Observing Systems (ASOS). The ASOS program is a joint effort of the National Weather Service (NWS), automatic weather station(AWS), the Federal Aviation Administration (FAA), and the Department of Defense (DOD). ASOS stations are designed to support weather forecast activities and aviation operations and, at
4186-427: Is divided into six regions. Each WFO maintains a specific area of responsibility spanning multiple counties, parishes or other jurisdictions within the United States – which, in some areas, cover multiple states – or individual possessions; the local offices handle responsibility of composing and disseminating forecasts and weather alerts to areas within their region of service. Some of the products that are only issued by
4347-624: Is either occurring at present (through radar imagery, reports from local television and radio stations, or ground observations by local law enforcement, civil defense officials, media outlets or storm spotters) or is forecast to occur within 12 to 24 hours. If after collaboration a warning or advisory is deemed necessary, the Weather Forecast Office will generate a bulletin product via the Advance Weather Interactive Processing System ( AWIPS ) and then disseminate
4508-543: Is essential for weather forecasting and research. The NWS operates 92 radiosonde locations in North America and ten sites in the Caribbean . A small, expendable instrument package is suspended below a 2 metres (6.6 ft) wide balloon filled with hydrogen or helium , then released daily at or shortly after 1100 and 2300 UTC , respectively. As the radiosonde rises at about 300 meters/minute (1,000 ft/min), sensors on
4669-488: Is gonna go with you and you're trying to do your best to keep your mom alive." Rita and her mother were swept against a building and thankfully rescued. There were others with the same experience while others were worse. Good Samaritans like Alex were left to clean up the mess and search for the less fortunate. He describes a gruesome scene, "I found a boy about 5 years old," Alex says. "He was dead, laying on some debris. I didn't touch him or nothing, I just went back and told
4830-527: Is home to a large herd of bison . Badlands National Park was established in 1978, and features an eroded, brightly colored landscape surrounded by semi-arid grasslands. Mount Rushmore National Memorial in the Black Hills was established in 1925. The sculpture of four U.S. Presidents was carved into the mountainside by sculptor Gutzon Borglum . Other areas managed by the National Park Service include Jewel Cave National Monument near Custer ,
4991-905: Is implemented by a commercial provider of satellite communications utilizing C band . The agency's online service, Weather.gov , is a data rich website operated by the NWS that serves as a portal to hundreds of thousands of webpages and more than 300 different NWS websites. Through its homepage, users can access local forecasts by entering a place name in the main forecast search bar, view a rapidly updated map of active watches and warnings, and select areas related to graphical forecasts, national maps, radar displays, river and air quality data, satellite images and climate information. Also offered are XML data feeds of active watches and warnings, ASOS observations and digital forecasts for 5x5 kilometer (3 x 3 mile) grids. All of NWS local weather forecast offices operate their own region-tailored web pages, which provide access to current products and other information specific to
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5152-405: Is not exercised, [..] could lead to situations that may threaten life and/or property." In earnest, they indicate that hazardous weather conditions are occurring that may pose a risk to life and property, and are intended to direct the general public to take immediate action and heed safety precautions; it also has the side purpose of directing emergency management personnel to be on standby in case
5313-510: Is often considered part of Tornado Alley , and South Dakota experiences an average of 30 tornadoes each year. Severe blizzards and ice storms often occur during winter. South Dakota has several sites administered by the National Park Service . Two national parks have been established in the state, both in its southwestern region. Wind Cave National Park , established in 1903 in the Black Hills , has an extensive cave network and
5474-467: The 1858 Treaty , ceding most of present-day eastern South Dakota to the United States. Land speculators founded two of eastern South Dakota's largest present-day cities: Sioux Falls in 1856 and Yankton in 1859. In 1861, the Dakota Territory was established by the United States government (this initially included North Dakota , South Dakota, and parts of Montana and Wyoming ). Settlement of
5635-406: The 50 United States . Pierre is the state capital , and Sioux Falls , with a population of about 213,900, is South Dakota's most populous city . The state is bisected by the Missouri River , dividing South Dakota into two geographically and socially distinct halves, known to residents as " East River " and " West River ". South Dakota is bordered by North Dakota to the north, Minnesota to
5796-504: The Charleston, West Virginia office's WeatherReady Nation initiative. The product provides a graphical depiction of short-fuse warnings and watches (specifically, tornado and severe thunderstorm watches and warnings, and flash flood warnings), showing a map of the warning area (outlined as a red polygon) and locations (including communities and interstate highways) that will be impacted. For severe thunderstorm, tornado and flash flood warnings,
5957-584: The Cincinnati Chamber of Commerce and Western Union , which he convinced to back the collection of such information. Meanwhile, Increase A. Lapham of Wisconsin lobbied Congress to create such a service, having witnessed the destructive power of storms in the Great Lakes region. Representative Halbert E. Paine introduced a bill to provide the funding. In 1870, the Weather Bureau of the United States
6118-516: The Department of Agriculture . Under the oversight of that branch, the Bureau began issuing flood warnings and fire weather forecasts, and issued the first daily national surface weather maps; it also established a network to distribute warnings for tropical cyclones as well as a data exchange service that relayed European weather analysis to the Bureau and vice versa. The first Weather Bureau radiosonde
6279-409: The Department of Commerce . In 1941, Margaret Smagorinsky (née Knoepfel) was hired as the Weather Bureau's first female statistician. On July 12, 1950, Bureau chief Francis W. Reichelderfer officially lifted the agency's ban on public tornado alerts in a Circular Letter, noting to all first order stations that "Weather Bureau employees should avoid statements that can be interpreted as a negation of
6440-684: The Family of Services (FOS) , which is accessible via dedicated telecommunications access lines in the Washington, D.C., area. All FOS data services are driven by the NWS Telecommunication Gateway computer systems located at NWS headquarters in Silver Spring, Maryland. Users may obtain any of the individual services from NWS for a one-time connection charge and an annual user fee. The WSR-88D Doppler weather radar system, also called NEXRAD ,
6601-510: The Federal Emergency Management Agency (FEMA) and the Department of Homeland Security have begun to take advantage of NWR's ability to efficiently reach a large portion of the U.S. population. When necessary, the system can also be used (in conjunction with the Emergency Alert System ) to broadcast civil, natural and technological emergency and disaster alerts and information, in addition to those related to weather – hence
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6762-647: The Lakota there. In 1980 the Supreme Court and Congress ordered compensation to be offered but the Lakota still refuse to accept it, insisting on return of their land. A growing population in the Dakota Territory caused political dissatisfaction between northern and southern territory residents, with the southern half being always more populated. Following the territorial capital being moved from Yankton to Bismarck in
6923-517: The Lewis and Clark Expedition to explore the region. In 1817, an American fur trading post was set up at present-day Fort Pierre , beginning continuous American settlement of the area. In 1855, the U.S. Army bought Fort Pierre but abandoned it in 1857 in favor of Fort Randall to the south. Settlement by Americans and Europeans was by this time increasing rapidly, and in 1858 the Yankton Sioux signed
7084-566: The Lewis and Clark National Historic Trail , the Minuteman Missile National Historic Site , which features a decommissioned nuclear missile silo and a separate missile control area several miles away, and the Missouri National Recreational River . The Crazy Horse Memorial is a large mountainside sculpture near Mount Rushmore being built using private funds. The Mammoth Site near Hot Springs
7245-561: The National Hurricane Center (NHC), a guidance center of the National Oceanic and Atmospheric Administration). The NWS defines a warning as a "hazardous weather or hydrologic event [that] is occurring, is imminent, or has a very high probability of occurring" and an advisory as "[highlighting] special weather conditions that are less serious than a warning [...] for events that may cause significant inconvenience, and if caution
7406-631: The North Central region of the United States . It is also part of the Great Plains . South Dakota is named after the Dakota Sioux tribe, which comprises a large portion of the population — with nine reservations currently in the state — and has historically dominated the territory. South Dakota is the 17th-largest by area , but the fifth-least populous , and the fifth-least densely populated of
7567-541: The Philippines , Mexico , Sudan and Ethiopia . The center of population of South Dakota is in Buffalo County , in the unincorporated county seat of Gann Valley . According to HUD 's 2022 Annual Homeless Assessment Report , there were an estimated 1,389 homeless people in South Dakota. In 2022, South Dakota had the lowest drug overdose death rate of any US state, at 11.3 per 100,000 people. According to
7728-541: The Pick–Sloan Plan was passed as part of the Flood Control Act of 1944 by the U.S. Congress, resulting in the construction of six large dams on the Missouri River, four of which are at least partially in South Dakota. Flood control, hydroelectricity , and recreational opportunities such as boating and fishing are provided by the dams and their reservoirs. In recent decades, South Dakota has been transformed from
7889-776: The Public Religion Research Institute in 2020, 73% of the adult population were Christian. Per the Pew Research Center 's separate 2014 study, the largest religious denominations in Christianity by number of adherents as a percentage of South Dakota's population in 2014 were the Catholic Church with 22 percent, evangelical Protestants with 25 percent, and mainline Protestants with 32 percent. Together, all kinds of Protestants accounted for 57 percent. Those unaffiliated with any religion represented 18 percent of
8050-550: The U.S. Virgin Islands ; and the U.S. Pacific Territories of American Samoa , Guam and the Northern Mariana Islands . NWR requires a scanner or special radio receiver capable of picking up the signal. Individual NWR stations broadcast any one of seven allocated frequencies centered on 162 MHz (known collectively as "weather band") in the marine VHF radio band. In recent years, national emergency response agencies such as
8211-557: The United States Voluntary Observing Ship (VOS) program. It is organized for the purpose of obtaining weather and oceanographic observations from transiting ships. An international program under World Meteorological Organization (WMO) marine auspices, the VOS has 49 countries as participants. The United States program is the largest in the world, with nearly 1,000 vessels. Observations are taken by deck officers, coded in
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#17328766150188372-437: The ring-necked pheasant , has adapted well to the area after being introduced from China . Growing populations of bald eagles are spread throughout the state, especially near the Missouri River . Rivers and lakes of the grasslands support populations of walleye , carp , pike , bass , and other species. The Missouri River also contains the pre-historic paddlefish . Due to a higher elevation and level of precipitation,
8533-434: The "increase in depth of water behind the dam of 11 to 12 feet," which caused the release of more water adding to the already moving floodwaters. The flash flood hit Rapid City the hardest around midnight on June 9; the flood waters also hit the small town of Keystone nearby. The flood caused a tremendous amount of damage. Flood waters displaced large rocks, trees, trailers, and vehicles, and carried homes away. In Rapid City
8694-456: The 1930s, several economic and climatic conditions combined with disastrous results for South Dakota. A lack of rainfall, extremely high temperatures and inappropriate cultivation techniques produced what was known as the Dust Bowl in South Dakota and several other plains states. Fertile topsoil was blown away in massive dust storms, and several harvests were completely ruined. The experiences of
8855-406: The 1990 and the 2000 census. During that time, nine counties had a population loss of greater than 10%, with Harding County , in the northwest corner of the state, losing nearly 19% of its population. Low birth rates and a lack of younger immigration has caused the median age of many of these counties to increase. In 24 counties, at least 20% of the population is over the age of 65, compared with
9016-467: The 2022 census estimate, the racial composition of the population was: Source: Ethnically, 4.9% of South Dakota's population was of Hispanic , Latino, or Spanish origin (they may be of any race). Ethnicity for the remainder of the population is not similarly accounted by the federal government. According to the U.S. Census Bureau, 25.4% of South Dakota's population younger than age 1 were 'minorities' as of 2011, meaning they had at least one parent who
9177-434: The 20th century included the Dust Bowl and Great Depression , increased federal spending during the 1940s and 1950s for agriculture and defense, and an industrialization of agriculture that has reduced family farming. Eastern South Dakota is home to most of the state's population, and the area's fertile soil is used to grow a variety of crops. West of the Missouri River, ranching is the predominant agricultural activity, and
9338-451: The Advance Weather Interactive Processing System ( AWIPS ), to complete their work. These workstations allow them to easily view a multitude of weather and hydrologic information, as well as compose and disseminate products. The NWS Environmental Modeling Center was one of the early users of the ESMF common modeling infrastructure. The Global Forecast System (GFS) is one of the applications that
9499-528: The Benefit of Commerce. Abbe was appointed as the Bureau's first chief meteorologist. In his earlier role as the civilian assistant to the chief of the Signal Service, Abbe urged the Department of War to research weather conditions to provide a scientific basis behind the forecasts; he would continue to urge the study of meteorology as a science after becoming Weather Bureau chief. While a debate went on between
9660-414: The Black Hills ecology differs significantly from that of the plains. The mountains are thickly blanketed by various types of pines , including ponderosa and lodgepole pines , as well as spruces . Black Hills mammals include deer , elk (wapiti) , bighorn sheep , mountain goats , pine marten , and mountain lions , while the streams and lakes contain several species of trout . South Dakota has
9821-461: The Black Hills, long considered sacred by Native Americans, differs from its surroundings to such an extent it can be considered separate from the rest of western South Dakota. At times the Black Hills are combined with the rest of western South Dakota, and people often refer to the resulting two regions divided by the Missouri River as West River and East River . Eastern South Dakota generally features higher precipitation and lower topography than
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#17328766150189982-500: The Bureau issued its first experimental public tornado forecasts in March 1952. In 1957, the Bureau began using radars for short-term forecasting of local storms and hydrological events, using modified versions of those used by Navy aircraft to create the WSR-57 ( W eather S urveillance R adar, 19 57 ), with a network of WSR systems being deployed nationwide through the early 1960s; some of
10143-601: The Bureau's willingness or ability to make tornado forecasts", and that a "good probability of verification" exist when issuing such forecasts due to the difficulty in accurately predicting tornadic activity. However, it would not be until it faced criticism for continuing to refuse to provide public tornado warnings and preventing the release of the USAF Severe Weather Warning Center's tornado forecasts (pioneered in 1948 by Air Force Capt. Robert C. Miller and Major Ernest Fawbush) beyond military personnel that
10304-478: The City Public Works Director, and we met at City Hall. Heavy rains were falling, and Mr. Swanson and I drove to Canyon Lake Park where a city worker and his family lived in the park caretaker's home, immediately below the dam. Swanny ordered the caretaker, a Parks Department employee, to immediately take his family, leave their evening meal on the table and get out of the park. The entire family survived
10465-546: The Dust Bowl, coupled with local bank foreclosures and the general economic effects of the Great Depression , resulted in many South Dakotans leaving the state. The population of South Dakota declined by more than 7% between 1930 and 1940. Economic stability returned with the U.S. entry into World War II in 1941, when demand for the state's agricultural and industrial products grew as the nation mobilized for war. In 1944,
10626-466: The Institute of Atmospheric Sciences on clouds west of Rapid City were speculated to have contributed to the unusual amount of rain. However, there is no evidence that the two phenomena were related. The immense precipitation was based over the "Rapid, Boxelder, Spring, and Battle Creeks," creating run-off, along these creeks which led to flooding throughout the surrounding areas. The intense rain began on
10787-411: The Missouri River create four large reservoirs: Lake Oahe , Lake Sharpe , Lake Francis Case , and Lewis and Clark Lake . South Dakota can generally be divided into three regions: eastern South Dakota, western South Dakota, and the Black Hills . The Missouri River serves as a boundary in terms of geographic, social, and political differences between eastern and western South Dakota. The geography of
10948-486: The NWS also, under a prescribed set of criteria, issue Fire Weather Watches and Red Flag Warnings as needed, in addition to issuing the daily fire weather forecasts for the local service area. These products alert the public and other agencies to conditions which create the potential for extreme fires. On the national level, the NWS Storm Prediction Center issues fire weather analyses for days one and two of
11109-577: The NWS introduced the Impact Based Warning system at its Weather Forecast Offices in Wichita and Topeka , Kansas , and Springfield , St. Louis and Kansas City / Pleasant Hill , Missouri ; the pilot project – which would expand to 80 Weather Forecast Offices overseen by the Central, Eastern, Southern and Western Region Headquarters by the spring of 2015 – incorporate message tags within the main body of
11270-516: The NWWS data stream are prioritized, with weather and hydrologic warnings receiving the highest priority (watches are next in priority). NWWS delivers severe weather and storm warnings to users in ten seconds or less from the time of their issuance, making it the fastest delivery system available. Products are broadcast to users via the AMC -4 satellite. The Emergency Managers Weather Information Network ( EMWIN )
11431-522: The National Weather Service office in Rapid City did not have a teletype system to broadcast warnings. They instead used a one-way telephone hotline to the media to broadcast the warnings. Today warnings are sent to a regional site where they are sent to the National Oceanic and Atmospheric Administration (NOAA) Weather Wire System satellite. NWS forecasters use the state radio system to notify 9-1-1 dispatchers and emergency personnel. This warning
11592-402: The National Weather Service", is a special radio system that transmits uninterrupted weather watches, warnings and forecasts 24 hours a day directly from a nearby NWS office, with the broadcasts covering across 95–97% of the United States' population. The system – which is owned and operated by the NWS – consists of 1,030 transmitters, covering all 50 states; adjacent coastal waters; Puerto Rico ;
11753-430: The Signal Service and Congress over whether the forecasting of weather conditions should be handled by civilian agencies or the Signal Service's existing forecast office, a Congressional committee was formed to oversee the matter, recommending that the office's operations be transferred to the Department of War following a two-year investigation. The agency first became a civilian enterprise in 1890, when it became part of
11914-586: The Traffic Management Units and control room supervisors. Special emphasis is given to weather conditions that could be hazardous to aviation or impede the flow of air traffic in the National Airspace System . Besides scheduled and unscheduled briefings for decision-makers in the ARTCC and other FAA facilities, CWSU meteorologists also issue two unscheduled products. The Center Weather Advisory (CWA)
12075-500: The WFOs are severe thunderstorm and tornado warnings, flood, flash flood , and winter weather watches and warnings, some aviation products, and local forecast grids. The forecasts issued by a WFO are available on their individual pages within the Weather.gov website, which can be accessed through either forecast landing pages (which identify the office that disseminates the weather data) or via
12236-436: The Weather Bureau became the National Weather Service. At the beginning of the 1980s the NWS used the same radar equipment as in the 1950s, and teletype for communication. In 1983, NOAA administrator John V. Byrne proposed to auction off all of the weather satellites, to repurchase data from private buyers, outsourcing weather observation stations, NOAA Weather Radio and computerized surface analysis to private companies but
12397-500: The addition of the phrasing "All Hazards" to the name. The NOAA Weather Wire Service (NWWS) is a satellite data collection and dissemination system operated by the National Weather Service, which was established in October 2000. Its purpose is to provide state and federal government, commercial users, media and private citizens with timely delivery of meteorological, hydrological, climatological and geophysical information. All products in
12558-470: The afternoon of June 9 and continued until after midnight on June 10. The immense amount of rain the Black Hills received during the thunderstorms ranged from 4 to 15 inches, causing Rapid Creek and surrounding creeks to overflow and creating massive amounts of runoff that resulted in flood waters. The run-off carried rubble to the Canyon Lake Dam creating a barrier in front of its spillway. This resulted in
12719-480: The alert map featured on the main page of the National Weather Service website. The NWS supports the aviation community through the production of several forecasts. Each area's WFO has responsibility for the issuance of Terminal Aerodrome Forecasts (TAFs) for airports in their jurisdiction. TAFs are concise, coded 24-hour forecasts (30-hour forecasts for certain airports) for a specific airport, which are issued every six hours with amendments as needed. As opposed to
12880-490: The alert through various communication routes accessed by the media and various agencies, on the internet, to NOAA satellites, and on NOAA Weather Radio . The product outlines the alert type, the issuing WFO, the sections of government subdivisions ( counties , parishes , boroughs or independent cities ) covered by the alert, and its time of expiration (based on the local time zone ). Some products – particularly for severe thunderstorm, tornado and flood warnings – include
13041-404: The alert, and boilerplate action messages informing the public of safety precautions they need to take or advising them to be vigilant of any warnings or weather statements that may be issued by their local National Weather Service office. A statement may be issued as a follow-up message to a warning, watch, or emergency, which may update, extend, or cancel the previously issued product or be used as
13202-419: The amount of runoff of the flood to come." On the afternoon of June 9, substantial rains fell on the area, caused by "an almost stationary group of thunderstorms." Additionally, "a strong low-level easterly flow which forced the moist unstable air up-slope on the hills. This sustained orographic effect helped the air to rise, cool, and release its moisture in repeating thunderstorms. Another contributing factor
13363-433: The area formed the shoreline of an ancient inland sea. Much of South Dakota (except for the Black Hills area) is dominated by a temperate grassland biome. Although grasses and crops cover most of this region, deciduous trees such as cottonwoods , elms, and willows are common near rivers and in shelter belts . Mammals in this area include bison , deer , pronghorn , coyotes , and prairie dogs . The state bird,
13524-426: The area, mostly by people from the eastern United States as well as western and northern Europe , increased rapidly, especially after the completion of an eastern railway link to Yankton in 1873. In 1874, gold was discovered in the Black Hills during a military expedition led by George A. Custer and miners and explorers began illegally entering land promised to the Lakota. Custer's expedition took place despite
13685-612: The areas in the Atlantic and parts of the Pacific. The Climate Prediction Center (CPC) in College Park, Maryland is responsible for all of the NWS's climate-related forecasts. Their mission is to "serve the public by assessing and forecasting the impacts of short-term climate variability, emphasizing enhanced risks of weather-related extreme events, for use in mitigating losses and maximizing economic gains." Their products cover time scales from
13846-416: The arrival of severe weather at a particular locale by one hour or less; the NWS also issues warnings and advisories for various hydrological and non-hydrological events including floods , non-thunderstorm high winds, winter storms , intense heat or cold, fire weather and marine hazards, which vary in timepsan depending on the weather situation ( inland and coastal warnings for tropical cyclones are issued by
14007-498: The atmosphere, more frequently, and from more locations is the key to improving forecasts and warnings. Due to the large installation and operating costs associated with ASOS, the stations are widely spaced. Therefore, the Cooperative Observer Program (COOP) , a network of approximately 11,000 mostly volunteer weather observers, provides much of the meteorological and climatological data to the country. The program, which
14168-490: The authorities where he was at. Then I quit." One unidentified resident of Rapid City, which was flooded, spoke to a reporter after the flood. "...the only thing above water is the hilltops. I guess it just ... I guess we gotta couple troubles." Another survivor said: "My house is no more. You can see it over there, there's the, well, there just isn't anything." And another unidentified survivor added: "A man knocked at our door and said, 'Get out as fast as you can.' We grabbed
14329-552: The basis of the warning or its damage threat). The wording " Particularly Dangerous Situation " (PDS), which originated by the Storm Prediction Center for use in tornado watch products during expected high-end severe weather outbreaks, is subjectively issued. It is occasionally issued with tornado warnings, normally if a large tornado capable of producing EF3 to EF5 damage or staying on the ground for long-duration – sometimes uninterrupted – paths has been reported (although
14490-410: The children and my dad's crippled and we picked him up and put him in the car, and just as we drove out the driveway, a big trailer started floating right across the pathway, and we just made it up the hill and that was all it was. Everything was gone." One source, Sean Potter, Certified Consulting Meteorologist and Certified Broadcast Meteorologist, wrote, "I called my best advisor, Mr. Leonard Swanson,
14651-499: The daily fire danger. Once per day, NWS meteorologists issue a coded fire weather forecast for specific United States Forest Service observation sites that are then input into the National Fire Danger Rating System (NFDRS). This computer model outputs the daily fire danger that is then conveyed to the public in one of five ratings: low, moderate, high, very high, or extreme. The local Weather Forecast Offices of
14812-407: The determination of the need for Red Flag Warnings. The Weather Prediction Center in College Park, Maryland provides guidance for future precipitation amounts and areas where excessive rainfall is likely, while local NWS offices are responsible for issuing Flood Watches, Flash Flood Watches, Flood Warnings, Flash Flood Warnings, and Flood Advisories for their local County Warning Area, as well as
14973-499: The east to semi-arid in the west. The state's ecology features species typical of a North American grassland biome. While several Democrats have represented South Dakota for multiple terms in both chambers of Congress , the state government is largely controlled by the Republican Party , whose nominees have carried South Dakota in each of the last 14 presidential elections . Historically dominated by an agricultural economy and
15134-477: The east, Iowa to the southeast, Nebraska to the south, Wyoming to the west, and Montana to the northwest. Humans have inhabited the area for several millennia, with the Sioux becoming dominant by the early 19th century. In the late 19th century, European-American settlement intensified after a gold rush in the Black Hills and the construction of railroads from the east. Encroaching miners and settlers triggered
15295-537: The economy is more dependent on tourism and defense spending. Most of the Native American reservations are in West River . The Black Hills , a group of low pine-covered mountains sacred to the Sioux, is in the southwest part of the state. Mount Rushmore , a major tourist destination, is there. South Dakota has a temperate continental climate , with four distinct seasons and precipitation levels ranging from moderate in
15456-438: The emigration of educated young adults to larger South Dakota cities, such as Rapid City or Sioux Falls, or to other states. Mechanization and consolidation of agriculture has contributed greatly to the declining number of smaller family farms and the resulting economic and demographic challenges facing rural towns. However, the state often ranks highly for its way of life, and Gallup's well-being index in 2018 named South Dakota
15617-434: The estimated population count of the warned area and approximate totals of public schools and hospitals within the warning area as well as the maximum forecast intensity of hail size, wind gusts and potential tornadoes; tornado warnings referenced in the impact product also denote whether the warning was issued based on radar indication or ground confirmation. NOAA Weather Radio All Hazards (NWR) , promoted as "The Voice of
15778-682: The fact that the Sioux had been granted the entire western half of present-day South Dakota ( West River ) in 1868 by the Treaty of Laramie as part of the Great Sioux Reservation . The Sioux declined to grant mining rights or land in the Black Hills, and war broke out after the U.S. failed to stop white miners and settlers from entering the region. Eventually the U.S. won and broke up the Great Sioux Reservation into five reservations, settling
15939-427: The flood resulted in the deaths of "238 including 5 missing," 14 of the deaths were trained professionals. The flood resulted in over 3,000 people being injured. A total of 1,335 homes were ruined, and 2,820 homes were damaged. More than 200 businesses were ruined, and around 5,000 cars were demolished. The damage in Rapid City totaled $ 66 million in 1972 dollar value. As for Keystone, "eight people were killed and much of
16100-403: The flood. Not a trace of the home (it was city property) or the contents was ever found. 44°03′28″N 103°17′13″W / 44.05778°N 103.28694°W / 44.05778; -103.28694 South Dakota South Dakota ( / d ə ˈ k oʊ t ə / ; Sioux : Dakȟóta itókaga , pronounced [daˈkˣota iˈtokaga] ) is a landlocked state in
16261-401: The forecast period that provide supportive information to the local WFO forecasts regarding particular critical elements of fire weather conditions. These include large-scale areas that may experience critical fire weather conditions including the occurrence of "dry thunderstorms", which usually occur in the western U.S. , and are not accompanied by any rain due to it evaporating before reaching
16422-421: The geology of this area. The Black Hills are in the southwestern part of South Dakota and extend into Wyoming . This range of low mountains covers 6,000 sq mi (16,000 km ), with peaks that rise from 2,000 to 4,000 feet (600 to 1,200 m) above their bases. The Black Hills are the location of Black Elk Peak (7,242 ft or 2,207 m above sea level), the highest point in South Dakota and also
16583-411: The guidance center initiates advisories and discussions on individual tropical cyclones, as needed. If a tropical cyclone threatens the United States or its territories, individual WFOs begin issuing statements detailing the expected effects within their local area of responsibility. The NHC and CPHC issue products including tropical cyclone advisories, forecasts, and formation predictions, and warnings for
16744-564: The happiest, healthiest state in the United States. South Dakota is in the north-central United States, and is considered a part of the Midwest by the U.S. Census Bureau; it is also part of the Great Plains region. The culture, economy, and geography of western South Dakota have more in common with the West than the Midwest. South Dakota has a total area of 77,116 square miles (199,730 km ), making
16905-529: The highest point in the United States east of the Rocky Mountains . Two-billion-year-old Precambrian formations, the oldest rocks in the state, form the central core of the Black Hills. Formations from the Paleozoic Era form the outer ring of the Black Hills; these were created between roughly 540 and 250 million years ago. This area features rocks such as limestone , which were deposited here when
17066-580: The ignition time, and other pertinent information. The WFO composes a short-term fire weather forecast for the location and sends it back to the officials, usually within an hour of receiving the request. The NWS assists officials at the scene of large wildfires or other disasters, including HAZMAT incidents, by providing on-site support through Incident Meteorologists (IMET). IMETs are NWS forecasters specially trained to work with Incident Management Teams during severe wildfire outbreaks or other disasters requiring on-site weather support. IMETs travel quickly to
17227-407: The incident site and then assemble a mobile weather center capable of providing continuous meteorological support for the duration of the incident. The kit includes a cell phone , a laptop computer , and communications equipment, used for gathering and displaying weather data such as satellite imagery or numerical forecast model output. Remote weather stations are also used to gather specific data for
17388-405: The internet, users can download and use the individual grids using a "GRIB2 decoder" which can output data as shapefiles , netCDF , GrADS , float files, and comma-separated value files. Specific points in the digital database can be accessed using an XML SOAP service. The National Weather Service issues many products relating to wildfires daily. For example, a Fire Weather Forecast, which have
17549-420: The issued watch, and SPC also issues mesoscale discussions focused upon possible convective activity. SPC compiles reports of severe hail, wind, or tornadoes issued by local WFOs each day when thunderstorms producing such phenomena occur in a given area, and formats the data into text and graphical products. It also provides forecasts on convective activity through day eight of the forecast period (most prominently,
17710-400: The land in the anticipated state of South Dakota belonged to the Sioux. Eventually, in the 1887 general election, Dakota Territory residents voted for the division, so it was divided in half and Republican President Benjamin Harrison signed proclamations formally admitting South Dakota and North Dakota to the union on November 2, 1889. Harrison had the papers shuffled to obscure which one
17871-534: The late evening hours of June 9 resulting in 238 deaths and 3,057 injuries. Over 1,335 homes and 5,000 automobiles were destroyed. The value of property damage was estimated to be over US$ 160 million in 1972 dollars ($ 1.17 billion in 2023 dollars). Flooding also occurred in Battle, Spring, Bear Butte, and Boxelder creeks. A few days before the Rapid City Flood, "earlier rains had left the soil saturated, increasing
18032-579: The legislature passed a law to make English the "common language" of the state. Since 2019, "the language of the Great Sioux Nation , comprised of three dialects, Dakota, Lakota, and Nakota " is the official indigenous language. As of the 2000 census, 1.90% of the population age 5 or older speak German at home, while 1.51% speak Lakota or Dakota , and 1.43% Spanish. As of 2010, 93.46% (692,504) of South Dakota residents age 5 and older spoke English as their primary language . 6.54% of
18193-607: The means of product dissemination, the NWS has been using more forecast products of a digital, gridded, image or other modern format. Each of the 122 Weather Forecast Offices (WFOs) send their graphical forecasts to a national server to be compiled in the National Digital Forecast Database (NDFD). The NDFD is a collection of common weather observations used by organizations and the public, including precipitation amount, temperature, and cloud cover among other parameters. In addition to viewing gridded weather data via
18354-420: The media. The personnel in Rapid City were not properly trained to make forecasts or use the technologies available to them. They lacked access to vital weather information to warn the area citizens. The Rapid City National Weather Service is now a forecast office with a full-time staff of meteorologists who issue both forecasts and warnings for northeastern Wyoming and the western third of South Dakota. In 1972,
18515-475: The nation's largest population of Hutterites , a communal Anabaptist group which emigrated in 1874 from German-speaking villages in what today is Ukraine but at that time was part of the Russian Empire . American Indians , largely Lakota , Dakota , and Nakota (Sioux), are predominant in several counties and constitute 20 percent of the population in West River . The seven large Indian reservations in
18676-739: The national average; Ziebach County ranked as the poorest county in the nation in 2009. The unemployment rate in Fort Thompson , on the Crow Creek Reservation , is 70%, and 21% of households lack plumbing or basic kitchen appliances. A 1995 study by the U.S. Census Bureau found 58% of homes on the Pine Ridge Indian Reservation did not have a telephone. The reservations' isolation also inhibits their ability to generate revenue from gaming casinos, an avenue that has proved profitable for many tribes closer to urban centers. In 1995
18837-614: The national waters of the United States. NWS national centers or Weather Forecast Offices issue several marine products: The National Hurricane Center (NHC) and the Central Pacific Hurricane Center (CPHC), respectively based in Miami, Florida and Honolulu, Hawaii , are responsible for monitoring tropical weather in the Atlantic , and central and eastern Pacific Oceans . In addition to releasing routine outlooks and discussions,
18998-470: The northern part, calls for dividing the territory increased. South Dakota held constitutional conventions in 1883, 1885, and 1889. Other account(s) state that the real reason for the split was a political lure for four Republican senators instead of two from the Republican dominated Dakota Territory and in their push to split the territory, Republican congressmen also ignored the uncomfortable fact that much of
19159-429: The northwestern part of the state (around 15 inches or 380 mm) to semi-humid around the southeast portion of the state (around 25 inches or 640 mm), although a small area centered on Lead in the Black Hills has the highest precipitation at nearly 30 inches (760 mm) per year. South Dakota summers bring frequent, sometimes severe, thunderstorms with high winds, thunder, and hail. The state's eastern part
19320-489: The office's local area of responsibility. Weather.gov superseded the Interactive Weather Information Network (IWIN) , the agency's early internet service which provided NWS data from the 1990s through the mid-2000s. Since 1983, the NWS has provided external user access to weather information obtained by or derived from the U.S. Government through a collection of data communication line services called
19481-399: The official rainfall forecast for areas within their warning area of responsibility. These products can and do emphasize different hydrologic issues depending on geographic area, land use, time of year, as well as other meteorological and non-meteorological factors (for example, during the early spring or late winter a Flood Warning can be issued for an ice jam that occurs on a river, while in
19642-823: The output of numerical weather models because large bodies of water have a profound impact on the weather. Other users rely on the observations and forecasts for commercial and recreational activities. To help meet these needs, the NWS's National Data Buoy Center (NDBC) in Hancock County, Mississippi operates a network of about 90 buoys and 60 land-based coastal observing systems (C-MAN). The stations measure wind speed, direction, and gust; barometric pressure; and air temperature. In addition, all buoy and some C-MAN stations measure sea surface temperature , and wave height and period. Conductivity and water current are measured at selected stations. All stations report on an hourly basis. Supplemental weather observations are acquired through
19803-470: The point of interest, and often receive direct support from the local WFO during such crises. IMETs, approximately 70 to 80 of which are employed nationally, can be deployed anywhere a disaster strikes and must be capable of working long hours for weeks at a time in remote locations under rough conditions. The National Weather Service is divided into 122 local branches, known as Weather Forecast Offices (WFOs), to issue products specific to those areas. The NWS
19964-645: The population spoke a language other than English. 2.06% (15,292) of the population spoke Spanish, 1.39% (10,282) spoke Dakota , and 1.37% (10,140) spoke German. Other languages spoken included Vietnamese (0.16%), Chinese (0.12%), and Russian (0.10%). Over the last several decades, the population in many rural areas has declined in South Dakota, in common with other Great Plains states. The change has been characterized as " rural flight " as family farming has declined. Young people have moved to cities for other employment. This trend has continued in recent years, with 30 of South Dakota's counties losing population between
20125-595: The population. As of the 2020 census, South Dakota ranked fifth-lowest in the nation in population and population density, only North Dakota , Alaska , Vermont , and Wyoming have fewer residents. Of the people residing in South Dakota, 65.7% were born in South Dakota, 31.4% were born in another U.S. state, 0.6% were born in Puerto Rico, U.S. Island areas, or born abroad to American parent(s), and 2.3% were born in another country. The top countries of origin for South Dakota's immigrants and refugees in 2018 were Guatemala ,
20286-475: The population. The breakdown of other religions was <1% Muslim, <1% Hindu and 1% Buddhist. The number of Jewish people in South Dakota is under 400, the lowest total in any of the fifty states. National Weather Service The National Weather Service ( NWS ) is an agency of the United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weather-related products to organizations and
20447-405: The product describing the source of the hazard report, damage potential, and if applicable, radar indications or physical observations of tornadoes or the possibility of a tornado; hazards are also summarized at the close of the product text (describing estimated maximum hail size and wind gusts, and if applicable, if a storm has the potential to produce a tornado or in the event of a tornado warning,
20608-471: The proposal failed in a Congressional vote. NEXRAD (Next Generation Radar), a system of Doppler radars deployed to improve the detection and warning time of severe local storms, replaced the WSR-57 and WSR-74 systems between 1988 and 1997. The NWS, through a variety of sub-organizations, issues different forecasts to users, including the general public. Although, throughout history, text forecasts have been
20769-622: The public for the purposes of protection, safety, and general information. It is a part of the National Oceanic and Atmospheric Administration (NOAA) branch of the Department of Commerce , and is headquartered in Silver Spring, Maryland , within the Washington metropolitan area . The agency was known as the United States Weather Bureau from 1890 until it adopted its current name in 1970. The NWS performs its primary task through
20930-578: The radars were upgraded to WSR-74 models beginning in 1974. In August 1966, the Weather Bureau became part of the Environmental Science Services Administration when that agency was formed. The Environmental Science Services Administration was renamed the National Oceanic and Atmospheric Administration (NOAA) on October 1, 1970, with the enactment of the National Environmental Policy Act . At this time,
21091-495: The radiosonde measure profiles of pressure, temperature, and relative humidity. These sensors are linked to a battery-powered radio transmitter that sends the sensor measurements to a ground receiver. By tracking the position of the radiosonde in flight, information on wind speed and direction aloft is also obtained. The flight can last longer than two hours, and during this time the radiosonde can ascend above 35 km (115,000 ft) and drift more than 200 km (120 mi) from
21252-419: The raw data is not available to the public). The National Weather Service has developed a multi-tier concept for forecasting or alerting the public to all types of hazardous weather: Short-fused weather warnings and advisories issued by local NWS forecast offices are generally less than 500–5,000 square miles (1,300–12,900 km ) in area. Warnings for severe local storms are intended to be issued preceding
21413-687: The region. The LaVérendrye group buried a plate near the site of modern-day Pierre , claiming the region for France as part of greater Louisiana . In 1762 the entire region became part of the Spanish Louisiana until 1802. By the early 19th century, the Sioux had largely replaced the Arikara as the dominant group in the area. In 1803, the United States purchased the Louisiana Territory , an area that included most of South Dakota, from Napoleon Bonaparte , and President Thomas Jefferson organized
21574-488: The release point. When the balloon has expanded beyond its elastic limit and bursts (about 6 m or 20 ft in diameter), a small parachute slows the descent of the radiosonde, minimizing the danger to lives and property. Data obtained during the flights is coded and disseminated, at which point it can be plotted on a Skew-T or Stuve diagram for analysis. In recent years, the National Weather Service has begun incorporating data from AMDAR in its numerical models (however,
21735-415: The right conditions to produce rainfall. The rainfall from the upper "cloud mass" above the Black Hills formed into new smaller masses downwind which reprocessed the rain allowing for the constant rainfall. The storm was described by Nair, Hjelmfelt, and Pielke as "convective cells of high precipitation efficiency a characteristic of tropical precipitation systems. Cloud seeding experiments being conducted by
21896-824: The same time, support the needs of the meteorological, hydrological, and climatological research communities. ASOS was especially designed for the safety of the aviation community, therefore the sites are almost always located near airport runways. The system transmits routine hourly observations along with special observations when conditions exceed aviation weather thresholds (e.g. conditions change from visual meteorological conditions to instrument meteorological conditions ). The basic weather elements observed are: sky condition, visibility, present weather, obstructions to vision, pressure, temperature, dew point , wind direction and speed, precipitation accumulation, and selected significant remarks. The coded observations are issued as METARs and look similar to this: Getting more information on
22057-456: The southeastern corner of South Dakota. Layers deposited during the Pleistocene epoch, starting around two million years ago, cover most of eastern South Dakota. These are the youngest rock and sediment layers in the state, the product of several successive periods of glaciation which deposited a large amount of rocks and soil, known as till , over the area. The Great Plains cover most of
22218-454: The specified sections of government sub-jurisdictions that the warning covers, based on the projected path of a storm as determined by Doppler radar at the time of the warning's issuance; however, entire counties/parishes may sometimes be included in the warning polygon, especially if they encompass a small geographical area. Warnings can be expanded, contracted (by removing jurisdictions where SPC and NWS forecasters no longer consider there to be
22379-568: The state occupy an area much diminished from their former Great Sioux Reservation of West River, which the federal government had once allocated to the Sioux tribes. South Dakota has the third-highest proportion of Native Americans of any state, behind Alaska and New Mexico . Five of the state's counties are wholly within the boundaries of sovereign Indian reservations . Because of the limitations of climate and land, and isolation from urban areas with more employment opportunities, living standards on many South Dakota reservations are often far below
22540-454: The state the 17th largest in the Union. Black Elk Peak , formerly named Harney Peak, with an elevation of 7,242 ft (2,207 m), is the state's highest point, while the shoreline of Big Stone Lake is the lowest, with an elevation of 966 ft (294 m). South Dakota is bordered to the north by North Dakota ; to the south by Nebraska ; to the east by Iowa and Minnesota ; and to
22701-582: The summer a Flood Warning will most likely be issued for excessive rainfall). In recent years, the NWS has enhanced its dissemination of hydrologic information through the Advanced Hydrologic Prediction Service (AHPS). The AHPS allows anyone to view near real-time observation and forecast data for rivers, lakes and streams. The service also enables the NWS to provide long-range probabilistic information which can be used for long-range planning decisions. Daily river forecasts are issued by
22862-401: The surface . State and federal forestry officials sometimes request a forecast from a WFO for a specific location called a "spot forecast", which are used to determine whether it will be safe to ignite a prescribed burn and how to situate crews during the controlling phase. Officials send in a request, usually during the early morning, containing the position coordinates of the proposed burn,
23023-617: The thirteen River Forecast Centers (RFCs) using hydrologic models based on rainfall, soil characteristics, precipitation forecasts, and several other variables. The first such center was founded on September 23, 1946. Some RFCs, especially those in mountainous regions, also provide seasonal snow pack and peak flow forecasts. These forecasts are used by a wide range of users, including those in agriculture , hydroelectric dam operation, and water supply resources. The National Weather Service Ocean Prediction Center (OPC) in College Park, Maryland issues marine products for areas that are within
23184-402: The threat of severe thunderstorms, the risk of which is assessed through a tiered system conveyed among six categories – general thunderstorms, marginal, slight, enhanced, moderate, or high – based mainly on the expected number of storm reports and regional coverage of thunderstorm activity over a given forecast day), and is responsible for issuing fire weather outlooks, which support local WFOs in
23345-523: The town was washed away." The damage in Keystone totaled around $ 1.5 million. The total cost of the 1972 Black Hills flood totaled $ 165 million, including infrastructure and utilities. The total amount of rain the Black Hills received was "800,000 acre feet" equal to "1 billion metric tons of water." The National Weather Service Office (NWS) in Rapid City in 1972 was taking hourly surface observations, issuing local storm warnings and providing local forecasts to
23506-431: The weather situation leads to property damage or casualties. Severe thunderstorm and flood warnings indicate that organized severe thunderstorms or flooding are occurring, whereas tornado warnings are issued if a storm is indicated to be producing an observed tornado or exhibits strong, low-level rotation. The process of issuing a warning or advisory begins with observations of a hydrological or extreme weather event that
23667-665: The west by Wyoming and Montana . The geographical center of the U.S. is 17 miles (27 km) west of Castle Rock in Butte County . The North American continental pole of inaccessibility is between Allen and Kyle , 1,024 mi (1,648 km) from the nearest coastline. The Missouri River is the largest and longest river in the state. Other major South Dakota rivers include the Cheyenne , James , Big Sioux , and White Rivers. Eastern South Dakota has many natural lakes, mostly created by periods of glaciation. Additionally, dams on
23828-925: The western part of the state. Smaller geographic regions of this area include the Coteau des Prairies , the Dissected Till Plains , and the James River Valley. The Coteau des Prairies is a plateau bordered on the east by the Minnesota River Valley and on the west by the James River Basin. Further west, the James River Basin is mostly low, flat, highly eroded land, following the flow of the James River through South Dakota from north to south. The Dissected Till Plains, an area of rolling hills and fertile soil that covers much of Iowa and Nebraska, extends into
23989-503: The western two-thirds of South Dakota. West of the Missouri River the landscape becomes more arid and rugged, consisting of rolling hills, plains, ravines, and steep flat-topped hills called buttes . In the south, east of the Black Hills, lie the South Dakota Badlands . Erosion from the Black Hills, marine skeletons which fell to the bottom of a large shallow sea that once covered the area, and volcanic material all contribute to
24150-431: Was 20 at the time, described the scene, "There was so many [people] in trees and screaming and crying and the sparks were flying from electric wires, houses were on fire, it was just — it was hell," she says. Rita was seven months pregnant at the time of the tragedy. She describes her fears as, "I wouldn't wish that upon nobody," she says. "That's a nightmare and a half to think that you're going to die in water and your mom
24311-436: Was a huge storm underway. Thompson further indicates that a cold high pressure region was pushed from Canada into the Great Lakes region leading into the western part of South Dakota. A "mesoscale cloud mass" from Colorado also moved towards Rapid City. One of the cloud masses amplified the "mid-level moisture over Rapid City," while the other mass caused the pressure to stay, as the high pressure pushed downward, thus creating
24472-554: Was developed by the National Weather Service during the mid-1980s, and fully deployed throughout the majority of the United States by 1997. There are 158 such radar sites in operation in the U.S., its various territorial possessions and selected overseas locations. This technology, because of its high resolution and ability to detect intra-cloud motions, is now the cornerstone of the agency's severe weather warning operations. National Weather Service meteorologists use an advanced information processing, display and telecommunications system,
24633-903: Was established in 1890 under the Organic Act, currently has a twofold mission: The National Weather Service also maintains connections with privately operated mesonets such as the Citizen Weather Observer Program for data collection, in part, through the Meteorological Assimilated Data Ingest System (MADIS). Funding is also provided to the CoCoRaHS volunteer weather observer network through parent agency NOAA. NWS forecasters need frequent, high-quality marine observations to examine conditions for forecast preparation and to verify their forecasts after they are produced. These observations are especially critical to
24794-489: Was established through a joint resolution of Congress signed by President Ulysses S. Grant with a mission to "provide for taking meteorological observations at the military stations in the interior of the continent and at other points in the States and Territories... and for giving notice on the northern (Great) Lakes and on the seacoast by magnetic telegraph and marine signals, of the approach and force of storms." The agency
24955-582: Was launched in Massachusetts in 1937, which prompted a switch from routine aircraft observation to radiosondes within two years. The Bureau prohibited the word " tornado " from being used in any of its weather products out of concern for inciting panic (a move contradicted in its intentions by the high death tolls in past tornado outbreaks due to the lack of advanced warning) until 1938, when it began disseminating tornado warnings exclusively to emergency management personnel. The Bureau would in 1940 be moved to
25116-544: Was not non-Hispanic white. As of 2000, the five largest ancestry groups in South Dakota are German (40.7%), Norwegian (15.3%), Irish (10.4%), Native American (8.3%), and English (7.1%). German Americans are the largest ancestry group in most parts of the state, especially in East River (east of the Missouri River), although there are also large Scandinavian-descended populations in some counties. South Dakota has
25277-461: Was placed under the Secretary of War as Congress felt "military discipline would probably secure the greatest promptness, regularity, and accuracy in the required observations." Within the Department of War , it was assigned to the U.S. Army Signal Service under Brigadier General Albert J. Myer . General Myer gave the National Weather Service its first name: The Division of Telegrams and Reports for
25438-470: Was signed first and the order went unrecorded. On December 29, 1890, the Wounded Knee Massacre occurred on the Pine Ridge Indian Reservation . Commonly cited as the last major armed conflict between the United States and the Lakota Sioux Nation , the massacre resulted in the deaths of at least 146 Sioux, many of them women and children. 31 U.S. soldiers were also killed in the conflict. During
25599-497: Was the first state to eliminate caps on interest rates . In 2007, the site of the recently closed Homestake gold mine near Lead was chosen as the location of a new underground research facility, the Deep Underground Science and Engineering Laboratory . Despite a growing state population and recent economic development, many rural areas have been struggling over the past 50 years with locally declining populations and
25760-402: Was the seventh fastest-growing county (by percentage) in the United States in 2010. The growth in these areas has compensated for losses in the rest of the state. South Dakota's total population continues to increase steadily, albeit at a slower rate than the national average. Religious self-identification, per Public Religion Research Institute 's 2022 American Values Survey According to
25921-477: Was the unusually light winds at a higher atmospheric levels which did not disperse the moist air nor move the thunderstorms along to prevent an extreme concentration of rainfall." According to Herbert Thompson the air pattern causing this storm was noticed in big measure over the Great Plains , with a minor scale to the east of the Rockies. There were only what appeared to be light winds, so nothing indicated that there
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