This Day in Weather History September 18
National Oceanic and Atmospheric Administration
1938: Unseasonably cool weather settled across Iowa on September 18-19, with temperatures dropping into the 30s at many locations on each day. Flurries were observed on the 18th at Orleans near the Appanoose/Davis county border and on the 19th at Maquoketa, making this one of the earliest fall snow events on record in Iowa.
1926: Very heavy rain fell across most of Iowa on September 17-18 with astounding amounts recorded in the far northwest. At Boyden an unofficial 24 hour accumulation of 21.70 inches was reported establishing the unofficial single day rainfall record for Iowa, with 15.1 inches of that total falling in just six hours. At Sioux Center an official 24 hour total of 11.66 inches was reported with 11.52 inches of that falling in 14 hours and 30 minutes. At Hawarden 10.19 inches fell in less than 30 hours with 7.30 inches of that falling in 5 hours and 30 minutes. Widespread flooding and flash flooding occurred and at Hawarden water 3 to 4 feet deep ran through the city washing out bridges and roads, flooding the entire business district and over 200 homes, and causing numerous fatalities.
1895: A late summer heat wave brought the temperature all the way up to 101 F at Sioux City which set their daily record and is also the latest occurrence of a 100 degree temperature on record at that location. Other reported high temperatures included 100 F at Keosauqua, 97 F at Atlantic and Corning, 96 F at Onawa, 95 F at Glenwood, Logan, and Keokuk, and 94 F at Des Moines and Rockwell City.
