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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]
High risk convective outlook issued by the Storm Prediction center at 13:00 UTC on May 6. Starting April 30, the Storm Prediction Center noted that certain models, including the ECMWF, forecasted a multi-day period of high instability and supportive wind shear across the Southern and Central Plains, [10] and by May 1, a 15% risk was added across Nebraska, Kansas, Oklahoma, and northern Texas. [11]
An enhanced risk day indicates that there is a greater threat for severe weather than that which would be indicated by a slight risk, but conditions are not adequate for the development of widespread significant severe weather to necessitate a moderate category, with more numerous areas of wind damage (often with wind gusts of 70 miles per hour ...
A tornado began in Rockford and moved northeastward through residential areas of the city, downing numerous trees and tree limbs, including some uprooted trees that fell onto homes. Multiple homes also had minor roof damage, and a few power poles were snapped as well. [10] EF1 Northern Rockford to Machesney Park to Roscoe: Winnebago: IL
The upshot. Twisters tend to strike in Tornado Alley, a nickname for the nation's central region with the most tornadoes from the 1950s to 1990s. 17 Texas, 12 Illinois, 9 Missouri, and 7 Kansas ...
That includes four strong tornadoes, of at least EF-2 strength. Two were rated EF-3 in southeastern Texas. In addition, over 200 reports of severe wind gusts or damage impacted the region.
Satellite image of the storm system responsible for the tornado outbreak that occurred on April 25–28, 2024. On April 20, 2024, the National Weather Service's Storm Prediction Center (SPC) first delineated a severe weather risk for April 25–26, highlighting a zone extending from the Central Great Plains northeastward to the Midwestern U.S.
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 ...