National Weather Service United States Department of Commerce

Overview

Severe thunderstorms developed along the Missouri River Valley and northwest Iowa during the afternoon of June 29, 2017. These storms produced large hail, damaging winds from 60 to 85 mph. The strongest wind gust was reported at Yankon Airport with 82 mph. The largest hail reported was softball size (4.5") near Sergeant Bluff, Iowa. There were two brief tornadoes south of the Missouri River in Nebraska.  Also, funnel clouds were reported around the Sioux City area.

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