1987: Severe thunderstorms produced large hail and widespread damage across Kossuth, Winnebago, Worth, and Mitchell counties in far northern Iowa. Near Grafton golf ball sized hail piled up to 8 inches deep on the ground.
1970: A line of severe thunderstorms produced very strong straight-line winds as it moved from northwest to southeast across Iowa, with a swath of significant damage stretching all the way from Sioux through Monona counties along the Missouri River to Scott through Lee counties along the Mississippi River and lighter damage 2 to 3 counties on either side of this swath. Although a few weak tornadoes were reported the wind damage was more severe and widespread. Numerous buildings lost their roofs in Sioux City and over 100,000 acres in Plymouth County suffered 50 to 100 percent crop destruction. Wind gusts reached 90 mph south of Storm Lake, 80 mph north of Harcourt, and 50 mph at Ames. The worst damage occurred in and around Sac City where 70 to 100 mph winds damaged nearly every structure in town making it the worst storm in that area in more than half a century. Significant damage also occurred in Cherokee and Hamilton counties. In total 2 people were killed and 19 were injured across Iowa.
1936: A summer of record breaking heat continued as the average high temperature across Iowa reached 108.7 F making it the hottest afternoon in Iowa history. The weather was made even more unbearable by very warm overnight low temperatures which prevented relief even during the early morning hours. Davenport reported a high of 111 F and low of 84 F thus setting its all time daily warm high and low temperature records on the same day. Other high temperatures around Iowa included 113 F at Bloomfield and Corydon, 112 F at Atlantic, Fairfield, Marshalltown, and Spencer, and 111 F at Burlington, Decorah, and Iowa Falls. The lowest maximum temperature reported in the entire state that afternoon was 104 F at Alton. Keokuk also reported an overnight low temperature of 84 F while Burlington and Little Sioux had lows of 82 F and 80 F, respectively. July 1936 remains the hottest month on record in Iowa with a statewide monthly average temperature of 83.2 F.
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This post was written by Schnack on July 14, 2012