From NWS
1988: A very hot and dry summer continued as temperatures rose above 100 degrees across much of Iowa on August 14-18 setting daily records at numerous stations. The hottest temperatures were recorded on the 15th and 17th with high temperatures on the 15th including 104 F at Centerville, Des Moines, Muscatine, Ottumwa, and Waterloo, 105 F at Fairfield, Fort Dodge, Lamoni, Webster City, and Winterset, 106 F at Jefferson, Keosauqua, Red Oak, and Washington, and 107 F at Iowa Falls and Sigourney.

15 August 1787 → The most extensive pre-Civil War tornado outbreak known in America struck New England from Connecticut to New Hampshire. No major towns were struck, but many farms were leveled. Orchards were swept away, and sod in pastures was ripped from the ground. A house in New Hampshire was obliterated, and the debris carried for three miles. 15 August 1946 → Parts of St. Louis, MO were deluged with more than 8 inches of rain in 24 hours.

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