Eight of the 10 worst U.S. tornado outbreaks have occurred in April or May, mostly due to the fact that upper echelon tornado intensities are more likely in those months. In addition, nine of the 10 worst individual tornadoes were spawned during April, May or June.
The reason why tornadoes are more common in spring compared to other months is because the required atmospheric ingredients come together more often this time of year.
Tornado outbreaks occur when a storm system propelled by a strong, southward dip in the jet stream punches into the Plains, Midwest or South. This is accompanied by warm and humid air flowing northward out of the Gulf of Mexico.
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