© Copyright TWC Product and Technology LLC 2014, 2020, Record Cold on Tap for Huge Area of Country Into Next Week, Colorado Wildfire’s Explosive Growth Forces Evacuations, Watch as Hurricane Hunters Break Through Epsilon's Eyewall, The Moment a Mountain of Debris Starts Flowing in the Philippines, Stunning Debris Flow in Philippines After Saudel’s Downpours, Some Good News About This Record-Breaking Hurricane Season. Tornado Alley is the unofficial name for a large swath of the central U.S. where tornadoes are particularly frequent. No definition of tornado alley has ever been officially chosen by the National Weather Service (NWS). Several other states, including Hawaii, New Hampshire, Vermont, Massachusetts, and Delaware were virtually tornado-free. 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Here are the 10 states with the highest numbers of tornadoes: * Data is averaged from period 1991–2010. , Coordinates: 35°N 88°W / 35°N 88°W / 35; -88, "Evidence of Smaller Tornado Alleys Across the United States Based on a Long Track F3-F5 Tornado Climatology Study from 1880-2003", "Climatology Risk of Strong and Violent Tornadoes In the United States", https://www.usatoday.com/story/weather/2018/10/17/tornado-alley-shifting-east/1660803002/, "Tornado Alley: The Most Tornado Prone Region In The World", "A historical and statistical comparison of "Tornado Alley" to "Dixie Alley", ". , No state is entirely free of tornadoes; however, they occur more frequently in the Central United States, between the Rocky Mountains and Appalachian Mountains. When these air masses come together, that creates the ideal conditions for large thunderstorms, which in turn can lead to tornadoes. "Average Annual Number of EF0-EF5 Tornadoes per 10,000 square miles during 1991 - 2010", http://ec.gc.ca/meteo-weather/default.asp?lang=En&n=6C5D4990-1#tornadoes, Climatological Estimates of Local Daily Tornado Probability for the United States, Statistical modeling of tornado intensity distributions, https://simple.wikipedia.org/w/index.php?title=Tornado_Alley&oldid=6686951, Creative Commons Attribution/Share-Alike License, John P. Gagan, Alan Gerard, and John Gordon (December 2010). Recently searched locations will be displayed if there is no search query. A study of 1921–1995 tornadoes concluded almost one-fourth of all significant tornadoes occur in this area.. , Tornado Alley can also be defined as an area reaching from central Texas to the Canadian prairies and from eastern Colorado to western Pennsylvania.  Some research suggests that tornadoes are becoming more frequent in the northern parts of Tornado Alley where it reaches the Canadian prairies. A tornado is seen South of Dodge City, Kansas, on May 24, 2016. Every year, an average of 1,253 twisters are recorded across the United States, according to the National Centers for Environmental Information. In Tornado Alley, warm, humid air from the equator meets cool to cold, dry air from Canada and the Rocky Mountains. That honor goes to Texas, which has an average of 155 twisters per year. While there’s no strict definition of Tornado Alley’s boundaries, it typically includes all or part of these states: Iowa, Missouri, Minnesota, and Illinois also experience relatively frequent tornadoes (45 or more per year, according to NOAA data), and are sometimes considered part of Tornado Alley. Canada gets the second most tornadoes in the world, after the United States. Tornadoes are also frequent in an area some people have dubbed Dixie Alley. Although the official boundaries of Tornado Alley are not clearly defined, the main alley extends from northern Texas, through Oklahoma, Kansas, Nebraska, Iowa, and South Dakota. Tornado Alley is a colloquial term for the area of the United States where tornadoes are most frequent. The following list, reported by the National Climatic Data Center shows the seventeen U.S. states with the highest average number of tornadoes per 10,000 sq. Compare that to Canada, the country with the second-highest number of tornadoes per year, at about 100. All states in Tornado Alley or Dixie Alley experience an average of 30 or more tornadoes every year. Tornado awareness, preparedness, and media weather coverage are also high.  A 2018 study found in the U.S., over the study period 1979-2017, an overall eastward shift of tornado frequency and impacts - toward Dixie Alley. Dixie Alley encompasses all or part of: Then there’s Florida. Only two states averaged zero tornadoes between 1991 and 2010, according to NOAA: Alaska and Rhode Island. All states in Tornado Alley or Dixie Alley experience an average of 30 or more tornadoes every year. Use escape to clear. Southwestern Ontario weather is strongly influenced by its peninsular position between the Great Lakes. Tornadoes are also unusual in states like Nevada, Utah, Arizona, Washington, Oregon, Maine, and New Jersey.  A study of 1921–1995 tornadoes concluded almost one-fourth of all significant tornadoes happen in this area. , The term "tornado alley" was first used in 1952 by U.S. Air Force meteorologists Major Ernest J. Fawbush (1915–1982) and Captain Robert C. Miller (1920–1998). That average is increasing as tornadoes are incurring with increasing frequency each year. However, deadly tornadoes still occur, especially when they happen outside of known tornado hotspots or at unusual times of the year. While it is not an official designation, states most commonly included are Texas, Oklahoma, Kansas, Nebraska, Missouri, Iowa, and South Dakota. Tornado Alley States 2020 Florida: 12.2 Kansas: 11.7 Maryland: 9.9 Illinois: 9.7 Mississippi: … Tornado Alley is the name commonly use for the corridor-shaped region in the United States Midwest that sees the most tornado activity. Increased temperature contrasts may also increase the violence and possibly the number of tornadoes. Tornado climatologists distinguish peaks in activity in certain areas and storm chasers have long recognized the Great Plains tornado belt.. , Over the years, the location(s) of Tornado Alley have not been clearly defined. Florida, while not geographically part of tornado alley, sees more tornados than any other state, especially when accounting for how large the state is. The Weather Channel's Jim Cantore takes a look at what states are in Tornado Alley. Meanwhile, warm wet air moves upward from the Gulf of Mexico. Tornadoes in this region are triggered or augmented by lake breeze fronts from Lake Huron, Lake Erie, Lake Ontario, and Georgian Bay.  In addition to the Texas/Oklahoma/Kansas core, such areas include the Upper Midwest, the lower Ohio Valley, the Tennessee Valley and the lower Mississippi valley. Together, these regions make up the northernmost border of the U.S. Tornado Alley. This creates an ideal environment for tornadoes to form within developed thunderstorms and super cells. The best information available on a per-state basis is twenty-five years old, the data can be extrapolated over the last two decades as tornado occurrences have increased.
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