December U.S. tornado record smashed by two outbreaks in five days.
Average U.S. tornadoes by month from 2000 through 2019.
Confirmed tornadoes by state for the Dec. 15 outbreak, as of Dec. 21, 2021, compared to previous December tornadoes in each state dating to 1950. These state totals may not be the final totals, as NWS may confirm additional tornadoes.one of the warmest Decembers on recordInstead of this warm air being trapped in the South as usual in December, it was drawn unusually far north, fueling both outbreaks.
That unusually warm air was topped by powerful winds from just 1,000 feet above the ground to jet-stream level, providing the wind shear needed for severe thunderstorms and tornadoes.As usual, a warming planet may not cause a particular weather event, such as a tornado outbreak. The link between global climate change and small-scale phenomena such as tornadoes is still not well understood.that found tornadoes are increasing in late fall and winter.
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