1680: The first confirmed true tornado in the United States touched down at Cambridge, Massachusetts. The funnel was filled with, stones, bushes, and other things. The tornado also unroofed a barn and snapped many large trees.

1922: Two tornadoes occurred near the southern border of South Dakota, with one at St. Charles in Gregory County, and the other on the southern shore of Lake Andes, in Charles Mix County. The distance apart was about 30 miles. The tornado in Gregory County missed the town of Lake Andes, however it destroyed about 29 cottages and 5 large barns. Fifteen people were injured, but no one was killed.

1951: An F2 touched down in open country and moved northeastward, passing three miles northwest of Corona in Roberts County. Thirteen buildings were destroyed on a farm with only the house left standing. Three cows and 20 pigs were killed.

2011: Historic releases on the Oahe Dam of 160,000 CFS kept the Missouri River from Pierre to Chamberlain at record flood levels throughout July. Extensive sandbagging and levee building had been done earlier to hold back the river. Residents in the Pierre, Fort Pierre, and Oacoma areas continued to be the most affected by the river. Many homes along with roads, crop and pastureland remained flooded throughout the month. The Missouri River at Pierre remained from 5 to 6 foot above flood stage throughout July. The Missouri River at Chamberlain reached a record stage of 75.1 feet on July 8th. Flood stage at Chamberlain is 65 feet. The flooding on the river began in late May and continued into August.

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