A moderate risk of severe thunderstorms this afternoon

Scattered thunderstorms are expected to develop by 4:00 pm CDT along a cold front near the Minnesota and South Dakota border.  More storms will gradually develop southward toward the Sioux City area early this evening.  Initially these storms will bring a threat of very large hail...up to the size of baseballs...and tornadoes.   The storms are then expected to evolve into a line during the evening as they approach Windom, Spencer, and Cherokee.  As they form into a line, the tornado threat will lessen. However, the risk of damaging winds will increase. Wind gusts in excess of 70 mph will be possible.  In addition, a few storms may produce hail up to the size of ping pong balls.  The storms are expected to move east of Spencer and Storm Lake by 10 pm.

For more information on the threat for severe weather, please see our Hazardous Weather Outlook or the national severe weather outlook by the Storm Prediction Center.


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