2007: Severe thunderstorms produced strong straight line winds across portions of Iowa, mainly in the south and southeast, on the afternoon and evening of August 23rd. As the night progressed the storms became less severe but began to produce very heavy rainfall and flash flooding across parts of southern Iowa. The worst flooding occurred in Wayne, Appanoose, and Davis counties with an incredible 12.34 inches of rain recorded in just over 12 hours at Rathbun Dam with most of that total falling in less than 9 hours ending on the morning of the 24th. Other rainfall amounts included 8.96 inches at Centerville, 8.17 inches at Bloomfield, 8.02 inches at Promise City, and 6.85 inches at Allerton. Many roads across the area were washed out, schools were cancelled, and there were evacuations in Centerville and Mystic. The water treatment plant in Ottumwa was inundated, leaving thousands of people without water. Nine counties in southern Iowa were declared state disaster areas.
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This post was written by Schnack on August 23, 2012