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- Tornadoes_in_the_United_States abstract "Tornadoes are more common in the United States than in any other country. The United States receives more than 1,200 tornadoes annually—four times the amount seen in Europe. Violent tornadoes—those rated EF4 or EF5 on the Enhanced Fujita Scale—occur more often in the United States than in any other country.Most tornadoes in the United States occur east of the Rocky Mountains. The Great Plains, the Midwest, the Mississippi Valley and the southern United States are all areas that are vulnerable to tornadoes. They are relatively rare west of the Rockies and are also less frequent in the northeastern states. Tornado Alley is a colloquial term for an area particularly prone to tornadoes. There is no officially defined 'Tornado Alley' - at its broadest this area stretches from North Texas to Canada with its core centered on Oklahoma, Kansas and northern Texas. Another highly significant region - colloquially known as Dixie Alley - is the southern United States and particularly the northern and central parts of Alabama and Mississippi. Florida is one of the most tornado prone states. However, Florida tornadoes only rarely approach the strength of those that occur elsewhere.Although favorable conditions for tornadoes in the United States can occur at any time, they are most common in spring and least common in winter. Because spring is a transitional period for the climate, there are more chances of cooler air meeting with warmer air, resulting in more thunderstorms. Tornadoes can also be spawned by landfalling tropical cyclones, which usually occur in late summer and autumn. In the United States, thunderstorms capable of producing tornadoes usually form when the temperature is at its highest, typically from 4:00 p.m. to 7:00 p.m.Although the period in which most tornadoes strike ("tornado season") is March through June, tornadoes - including violent tornadoes and major tornado outbreaks - have been documented in the United States during every month of the year. Two examples of this are when a series of tornadoes hit the state of Indiana on November 22, 1992, and injured at least nine people. Another notable non-season tornado was on December 9, 1991, where a tornado struck the area of McLean County, Illinois. Even though the tornado was during a winter month, it blew 20 railroad cars off their tracks, and hauled a camper over 100 yards (91 m).During the winter months of the year, tornadoes have been known to hit the Southern United States and Southeastern United States the most, but have hit other areas as well. One notable recent example of a winter tornado outbreak was the 2008 Super Tuesday tornado outbreak on February 5 and February 6, 2008. 84 tornadoes occurred over the course of the outbreak. The storm system produced several destructive tornadoes in heavily populated areas, most notably in the Memphis metropolitan area, in Jackson, Tennessee, and the northeastern end of the Nashville metropolitan area. At least 57 people were killed across four states and 18 counties, with hundreds of others injured. The outbreak was the deadliest of the modern NEXRAD doppler radar era, until the April 25–28, 2011 tornado outbreak killed over 348 people (324 of which were tornado-related). It was the deadliest single outbreak since the May 31, 1985 outbreak, which killed 76 across Ohio and Pennsylvania, as well claiming 12 victims in Ontario, Canada. It was also the deadliest outbreak in both Tennessee and Kentucky since the Super Outbreak.Usually, tornadoes hit specific areas of the United States in specific seasons. During the winter months, tornadoes are usually spotted in the Southern area of the country, as well as states near the Gulf of Mexico. This is due to cold air moving southward reaching its southern limit of expansion, and stopping over the Gulf Coast. As spring comes, hot air progressively moves back into the Gulf Coast. This pushes the mass of colder air forward out of the Gulf States and into the Southeastern states, where tornado frequency is highest in April.As spring passes and summer begins, the mass of warm moist air moves northwest into the Great Plains and Midwestern states. During the months of May and June, tornado activity is as its peak in the southern Great Plains. The air mass then moves northward into the Northern Great Plains and the Great Lakes area, causing a tornado activity peak in these areas during the summer months. During the late summer and early fall months, tornado activity in the United States tapers off. This is due to the relatively small difference between the temperature at the boundary of the hot air mass and the cool air mass at that time and an extension of the Bermuda High sitting over parts of the United States. Though there may be some thunderstorms, they don't often become severe enough to spawn tornadoes.Tornadoes may be formed out of season, especially during the months of hurricane season in the Gulf Coast states and Southeastern states. Because these areas are prone to hurricanes, they may be struck with tornadoes that are spawned from hurricanes. Tornadoes are most likely to form in the right-front quadrant of the hurricane, but can also form in rain bands associated with the storm. This is caused by the large amount of vertical wind shear to the right of the storm. Tornadoes are also spawned from U.S. hurricanes due to the moistness of the air at the landfall of the storm, which makes conditions favorable for a supercell storm to develop within the hurricane.".
- Tornadoes_in_the_United_States thumbnail Tornado_Alley.gif?width=300.
- Tornadoes_in_the_United_States wikiPageExternalLink index.html.
- Tornadoes_in_the_United_States wikiPageExternalLink nwi.
- Tornadoes_in_the_United_States wikiPageExternalLink www.ejssm.org.
- Tornadoes_in_the_United_States wikiPageExternalLink U_S_SEVERE.html.
- Tornadoes_in_the_United_States wikiPageExternalLink severe.php.
- Tornadoes_in_the_United_States wikiPageExternalLink monthlytornstats.html.
- Tornadoes_in_the_United_States wikiPageID "18436515".
- Tornadoes_in_the_United_States wikiPageLength "32850".
- Tornadoes_in_the_United_States wikiPageOutDegree "173".
- Tornadoes_in_the_United_States wikiPageRevisionID "683376314".
- Tornadoes_in_the_United_States wikiPageWikiLink 1896_St._Louis–East_St._Louis_tornado.
- Tornadoes_in_the_United_States wikiPageWikiLink 1899_New_Richmond_tornado.
- Tornadoes_in_the_United_States wikiPageWikiLink 1908_Dixie_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 1908_Southeast_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 1936_Tupelo–Gainesville_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 1965_Palm_Sunday_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 1966_Candlestick_Park_tornado.
- Tornadoes_in_the_United_States wikiPageWikiLink 1972_Portland-Vancouver_Tornado.
- Tornadoes_in_the_United_States wikiPageWikiLink 1972_Portland–Vancouver_tornado.
- Tornadoes_in_the_United_States wikiPageWikiLink 1985_United_States-Canadian_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 1985_United_States–Canada_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 1998_Kissimmee_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 1999_Oklahoma_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 2007_Central_Florida_Tornadoes.
- Tornadoes_in_the_United_States wikiPageWikiLink 2007_Groundhog_Day_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink 2008_Super_Tuesday_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink Alabama.
- Tornadoes_in_the_United_States wikiPageWikiLink Alaska.
- Tornadoes_in_the_United_States wikiPageWikiLink American_Samoa.
- Tornadoes_in_the_United_States wikiPageWikiLink Andover,_Kansas.
- Tornadoes_in_the_United_States wikiPageWikiLink Appalachian_Mountains.
- Tornadoes_in_the_United_States wikiPageWikiLink April_25–28,_2011_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink Arizona.
- Tornadoes_in_the_United_States wikiPageWikiLink Arkansas.
- Tornadoes_in_the_United_States wikiPageWikiLink Atlantic_hurricane_season.
- Tornadoes_in_the_United_States wikiPageWikiLink Azores_High.
- Tornadoes_in_the_United_States wikiPageWikiLink Bermuda_High.
- Tornadoes_in_the_United_States wikiPageWikiLink Bridge_Creek,_Oklahoma.
- Tornadoes_in_the_United_States wikiPageWikiLink California.
- Tornadoes_in_the_United_States wikiPageWikiLink Canada.
- Tornadoes_in_the_United_States wikiPageWikiLink Candlestick_Park_Tornado.
- Tornadoes_in_the_United_States wikiPageWikiLink Category:Climate_of_the_United_States.
- Tornadoes_in_the_United_States wikiPageWikiLink Category:Tornadoes_in_the_United_States.
- Tornadoes_in_the_United_States wikiPageWikiLink Climate_of_the_United_States.
- Tornadoes_in_the_United_States wikiPageWikiLink Colorado.
- Tornadoes_in_the_United_States wikiPageWikiLink Connecticut.
- Tornadoes_in_the_United_States wikiPageWikiLink Delaware.
- Tornadoes_in_the_United_States wikiPageWikiLink District_of_Columbia.
- Tornadoes_in_the_United_States wikiPageWikiLink Dixie_Alley.
- Tornadoes_in_the_United_States wikiPageWikiLink Doppler_on_Wheels.
- Tornadoes_in_the_United_States wikiPageWikiLink East_St._Louis.
- Tornadoes_in_the_United_States wikiPageWikiLink East_St._Louis,_Illinois.
- Tornadoes_in_the_United_States wikiPageWikiLink Enhanced_Fujita_Scale.
- Tornadoes_in_the_United_States wikiPageWikiLink Enhanced_Fujita_scale.
- Tornadoes_in_the_United_States wikiPageWikiLink File:Dszpics1.jpg.
- Tornadoes_in_the_United_States wikiPageWikiLink Flint,_Michigan.
- Tornadoes_in_the_United_States wikiPageWikiLink Flint-Worcester_tornado_outbreak_sequence.
- Tornadoes_in_the_United_States wikiPageWikiLink Flint–Worcester_tornado_outbreak_sequence.
- Tornadoes_in_the_United_States wikiPageWikiLink Florida.
- Tornadoes_in_the_United_States wikiPageWikiLink Great_Lakes.
- Tornadoes_in_the_United_States wikiPageWikiLink Great_Natchez_Tornado.
- Tornadoes_in_the_United_States wikiPageWikiLink Great_Plains.
- Tornadoes_in_the_United_States wikiPageWikiLink Guam.
- Tornadoes_in_the_United_States wikiPageWikiLink Gulf_Coast.
- Tornadoes_in_the_United_States wikiPageWikiLink Gulf_Coast_of_the_United_States.
- Tornadoes_in_the_United_States wikiPageWikiLink Gulf_of_Mexico.
- Tornadoes_in_the_United_States wikiPageWikiLink Hurricane.
- Tornadoes_in_the_United_States wikiPageWikiLink Idaho.
- Tornadoes_in_the_United_States wikiPageWikiLink Illinois.
- Tornadoes_in_the_United_States wikiPageWikiLink Indiana.
- Tornadoes_in_the_United_States wikiPageWikiLink Iowa.
- Tornadoes_in_the_United_States wikiPageWikiLink Jackson,_Tennessee.
- Tornadoes_in_the_United_States wikiPageWikiLink Kansas.
- Tornadoes_in_the_United_States wikiPageWikiLink Kentucky.
- Tornadoes_in_the_United_States wikiPageWikiLink Kissimmee.
- Tornadoes_in_the_United_States wikiPageWikiLink Kissimmee,_Florida.
- Tornadoes_in_the_United_States wikiPageWikiLink Kissimmee_Tornado_Outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink Lake_County,_Florida.
- Tornadoes_in_the_United_States wikiPageWikiLink Landfall.
- Tornadoes_in_the_United_States wikiPageWikiLink Landfall_(meteorology).
- Tornadoes_in_the_United_States wikiPageWikiLink List_of_F5_and_EF5_tornadoes.
- Tornadoes_in_the_United_States wikiPageWikiLink List_of_Hawaii_tornadoes.
- Tornadoes_in_the_United_States wikiPageWikiLink List_of_North_American_tornadoes_and_tornado_outbreaks.
- Tornadoes_in_the_United_States wikiPageWikiLink Louisiana.
- Tornadoes_in_the_United_States wikiPageWikiLink Maine.
- Tornadoes_in_the_United_States wikiPageWikiLink Maryland.
- Tornadoes_in_the_United_States wikiPageWikiLink Massachusetts.
- Tornadoes_in_the_United_States wikiPageWikiLink May_2007_Tornado_Outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink May_2007_tornado_outbreak.
- Tornadoes_in_the_United_States wikiPageWikiLink McLean_County,_Illinois.
- Tornadoes_in_the_United_States wikiPageWikiLink Memphis_metropolitan_area.
- Tornadoes_in_the_United_States wikiPageWikiLink Mississippi.
- Tornadoes_in_the_United_States wikiPageWikiLink Missouri.
- Tornadoes_in_the_United_States wikiPageWikiLink Mobile_home.
- Tornadoes_in_the_United_States wikiPageWikiLink Monsoon.
- Tornadoes_in_the_United_States wikiPageWikiLink Montana.
- Tornadoes_in_the_United_States wikiPageWikiLink NEXRAD.
- Tornadoes_in_the_United_States wikiPageWikiLink Nashville_metropolitan_area.