National Weather Service United States Department of Commerce
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A deep, fall-like storm system slowly made its way across South Dakota and Minnesota during the day on Tuesday, the 18th, into Wednesday, the 19th. In Aberdeen, the rain began on the 18th at 7 am and ended at 3 am on the 19th - that's 20 straight hours of rainfall (with at least a trace reported each hour). In Watertown, the rain began at 7 am on the 18th as well, but didn't stop until 10 am on the 19th - that's 27 straight hours of rain! This was the story for many across the area, and widespread heavy rainfall was the result. Two daily precipitation records on the 18th were set: Pierre with 1.88" (0.89" in 2006) and Watertown with 3.08" (1.93" in 1971).



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Additionally, unseasonably cold air accompanied the system leading to several record low maximum temperatures. You may have found yourself reaching for a coat, just 3 days after heat index values were above 100 degrees!