Severe weather event in the United States
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From April 30–May 1, 1949, a tornado outbreak swept eastward across the United States, beginning over the Great Plains. The severe weather event claimed 10 lives and inflicted over 100 injuries. It produced several deadly tornadoes, mostly in Oklahoma, including a pair that killed three each on April 30. The most intense tornado of the outbreak, retroactively rated a violent F4, tracked across parts of the Oklahoma City metropolitan area that day. A deadly F3 the following day claimed a life in Louisiana as well. This outbreak alone set an official monthly record of tornadoes to date in Oklahoma.
Confirmed tornadoes.
Prior to 1990, there is a likely undercount of tornadoes, particularly E/F0–1, with reports of weaker tornadoes becoming more common as population increased. A sharp increase in the annual average E/F0–1 count by approximately 200 tornadoes was noted upon the implementation of NEXRAD Doppler weather radar in 1990–1991. 1974 marked the first year where significant tornado (E/F2+) counts became homogenous with contemporary values, attributed to the consistent implementation of Fujita scale assessments. Numerous discrepancies on the details of tornadoes in this outbreak exist between sources. The total count of tornadoes and ratings differs from various agencies accordingly. The list below documents information from the most contemporary official sources alongside assessments from tornado historian Thomas P. Grazulis.
Notes.
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References.
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