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The drought began on May 20, 2013, following the dissipation of the 2013 Moore, Oklahoma EF5 tornado. [11] [12] Several tornadoes since the Moore EF5 have reached the 200 miles per hour (320 km/h) wind speeds needed for a tornado to be classified as an EF5, including the 2013 El Reno EF3 tornado and 2015 Rochelle–Fairdale EF4 tornado, with wind speeds measured in excess of 295 miles per hour ...
F5 and EF5 Tornadoes in the United States 1950–2019 Detailed map. The tornadoes on this list have been formally rated F5 by an official government source. Unless otherwise noted, the source of the F5 rating is the U.S. National Weather Service (NWS), as shown in the archives of the Storm Prediction Center (SPC) and National Climatic Data ...
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]
Before the Moore tornado, the blockbuster tornado season in 2011 led to the confirmation of five EF5 twisters, including the Joplin, Missouri, EF5 that killed 161 people. A total of 50 tornadoes ...
The strongest (violent EF4/EF5) tornadoes occurred in the high-risk area (many in/near the 45% probability) while dozens of other tornadoes were confirmed throughout the other risk areas. Three of the tornadoes tracked over 100 miles (160 km), with one of them becoming the deadliest tornado ever recorded in Alabama .
The last EF5 tornado to touch down in the United States was 10 years ago. On May 20, 2013, at least 24 people died after an EF5 tornado wreaked havoc across Moore, Oklahoma.
List of tornadoes in the tornado outbreak of March 31 – April 1, 2023#Mississippi (March 31 – April 1) Parkersburg—New Hartford, Iowa: 2008 May 25 $75,000,000 $107,435,916: EF5 Tornado outbreak of May 22–27, 2008: St. Louis, Missouri: 1959 February 10 $10,000,000 $105,985,223: F4 St. Louis tornado outbreak of February 1959:
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 ...