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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 ...
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 ...
Such warnings have been issued for, among other significant tornado events, the F5-rated tornado that destroyed much of Bridge Creek, Moore and portions of southeastern Oklahoma City, Oklahoma on May 3, 1999 (during which the product was conceived by the NWS Forecast Office in Norman); the EF5 tornado that destroyed much of Greensburg, Kansas ...
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]
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.
Here's how tornadoes are rated on the Enhanced Fujita scale and what those ratings mean.
The following is a list of the costliest tornadoes in the Americas including Canada and the United States. It includes all tornadoes that, when damage totals are adjusted for inflation, have cost at least $100 million in damages (in 2024 dollars).
Six EF5 tornadoes have occurred in Iowa in since 1950, according to the National Oceanic and Atmospheric Administration. This is the highest rating that can be assigned to a tornado on the ...