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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 ...
This new warning system, named Warn-on-Forecast System (WoFS), was created by the Hazardous Weather Testbed housed in the National Weather Center in Norman, Oklahoma. During the experiment and test, the WoFS gave a high indication of “near-ground rotation” in and around the area of Greenfield, Iowa between 2-4 p.m.
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.
The tornado, known as the Greensburg EF5 or GT in a later study, [note 2] tracked 28.8 miles (46.3 km) through the area, killing thirteen people and injuring sixty-three others. The tornado was the first to be rated EF5 on the Enhanced Fujita scale after the retirement of the original Fujita scale in the United States on February 1, 2007. [3] [4]
Security camera footage captured a tornado moving through Madison County in February. The tornado was classified as an EF1 twister on the Enhanced Fujita scale by the National Weather Service.
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 ...
Along Heaton Road, the tornado grew much wider, reaching EF5 intensity for the first time shortly thereafter. A metal farm building was completely destroyed, along with numerous homes, with some lower-bound homes being wiped off their foundations. The tornado maintained EF5 intensity, producing significant ground scouring, as it exited Shiloh. [11]