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Tornadoes can form in any month when conditions are favorable. [1] [a] 1,000 or more tornadoes a year are reported in the contiguous United States. The high frequency of tornadoes in North America is largely due to geography, as moisture from the Gulf of Mexico is easily advected into the
Tornadoes of 1945. Tornado outbreak of February 12, 1945; Tornado outbreak of April 12, 1945; Tornadoes of 1946. List of United States tornadoes in 1946.
However, tornadoes are capable of both much shorter and much longer damage paths: one tornado was reported to have a damage path only 7 feet (2.1 m) long, while the record-holding tornado for path length—the Tri-State Tornado, which affected parts of Missouri, Illinois, and Indiana on March 18, 1925—was on the ground continuously for 219 ...
A comparison of the widths of various tornadoes exceeding 1 mile (2.2 km), superimposed over a map of El Reno, Oklahoma. This is a list of tornadoes by their official and unofficial width. The average width of a tornado according to the National Weather Service is 50 yards (46 m). [1]
Outbreak produced the Candlestick Park tornado, which was an extremely violent F5 tornado or tornado family that killed 58 people and traveled 202.5 mi (325.9 km) across Mississippi and Alabama. It is one of the longest such paths on record and one of only four official F5 tornadoes to hit Mississippi.
Tornado Alley, also known as Tornado Valley, is a loosely defined location of the central United States and Canada where tornadoes are most frequent. [1] The term was first used in 1952 as the title of a research project to study severe weather in areas of Texas , Louisiana , Oklahoma , Kansas , South Dakota , Iowa and Nebraska .
Violent tornadoes are extremely rare outside of the United States and Canada. F5 and EF5 tornadoes are rare. In the United States, they typically only occur once every few years, [14] and account for approximately 0.1 percent of confirmed tornadoes. [15] An F5 tornado was reported in Elie, Manitoba, in Canada, on June 22, 2007. [16]
The 2011 Super Outbreak was the largest tornado outbreak spawned by a single weather system in recorded history; it produced 367 tornadoes from April 25–28, with 223 of those in a single 24-hour period on April 27 from midnight to midnight CDT, [4] [11] fifteen of which were violent EF4–EF5 tornadoes. 348 deaths occurred in that outbreak, of which 324 were tornado related.