![]() ![]() It is the longest-lived and has the longest path of any recorded US tornado.ġ950 – The United States begins keeping official records about tornadoes.įebru– At least 20 people are killed in Lake and Volusia counties in Florida after at least three tornadoes touch down in the middle of the night. Ma– The deadliest US tornado in modern history hits the tri-state area of Missouri, Illinois and Indiana, killing 695 people. It is used to assign a tornado a rating based on estimated wind speed and damage the tornado causes.ĮF0 is the weakest point on the Enhanced Fujita Scale and EF5 is the strongest. The Enhanced Fujita scale became operational on February 1, 2007. The term was coined by forecasters in May 1999 and is used sparingly. A severe threat to human life and catastrophic damage from a tornado is imminent or ongoing. Tornadoes usually occur during the spring and early summer, most often in the late afternoon and early evening.Ī tornado watc h is issued by the National Weather Service when atmospheric conditions promote the forming of tornadoes.Ī tornado warning is issued when Doppler radar detects a mesocyclone in a thunderstorm or when a funnel cloud has been spotted.Ī tornado emergency is enhanced wording in a tornado warning indicating a large tornado is moving into a heavily populated area. The United States has the highest number of tornado occurrences in the world with an average of more than 1,000 tornadoes reported each year.Ī disproportionately high frequency of tornadoes occurs in Florida and a region called “Tornado Alley,” which spans across the central southern plans. ![]()
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