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Hot in Parts of the West; Cold Blast Coming to the Central U.S.

Hot to extremely hot temperatures are in place much of this week across parts of California and the interior Northwest U.S. A blast of cold air will drop across the central and eastern U.S. later this week bringing below to well below normal temperatures. Read More >

Overview

From the evening of May 20th through mid afternoon on May 21st, several waves of thunderstorms produced tornadoes, damaging winds with gusts up to 90 mph, hail up to tennis-ball size, and extremely heavy rainfall, which resulted in considerable flash flooding and river flooding.

Six tornadoes (5 EF0 and 1 EF1) occurred with a fast-moving line of thunderstorms that moved through eastern Nebraska and southwest Iowa during the early morning hours on the 21st. An additional 4 tornadoes occurred with a second round of thunderstorms (supercells) that formed over far eastern Nebraska and tracked through southwest Iowa during the late morning and early afternoon hours on the 21st. 

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Radar loop from 4 PM on May 20th through 3 PM on May 21st
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