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Since its initial usage in May 1999, the National Weather Service (NWS) in the United States has used the tornado emergency bulletin — a high-end classification of tornado warning — sent through either the issuance of a warning or via a "severe weather statement" that provides updated information on an ongoing warning—that is issued when a violent tornado (confirmed by radar or ground ...
A deadly outbreak, including the deadliest and longest-tracked tornado in U.S. history–the Tri-State tornado, a massive F5 tornado that traveled 219 mi (352 km) across the three states of Missouri, Illinois, and Indiana, killing 695 people. Third-costliest U.S. tornado ever.
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.
The deadliest tornado in modern U.S. history struck Joplin, Missouri, on May 22, 2011. It was the deadliest tornado since SPC records began in 1950. Nearly 1,000 were injured. The EF5 tornado had ...
Progression of a well-anticipated high risk event across the Central Plains on April 14, 2012. This event ultimately produced 85 tornadoes that day, one of which killed six people. A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center (SPC) for convective weather events in the United States. On the ...
Strong mesocyclones show up as adjacent areas of yellow and blue (on other radars, bright red and bright green), and usually indicate an imminent or occurring tornado. The history of tornado research spans back centuries, with the earliest documented tornado occurring in 200 and academic studies on them starting in the 18th century. This is a ...
The National Weather Service (NWS) issued 126 tornado warnings in Florida on Wednesday, Oct. 9, a new state record. A total of 45 tornado reports were received during the storms, and the NWS had ...
In late 2023, American meteorologist and tornado expert Thomas P. Grazulis created the Outbreak Intensity Score (OIS) as a way to rank tornado outbreaks. [1] [2] For the score, only significant tornadoes are counted: F2/EF2 tornadoes receive 2 points each, F3/EF3 tornadoes receive 5 points each, F4/EF4 tornadoes receive 10 points each, and F5/EF5 tornadoes receive 15 points each. [1]