National Weather Service United States Department of Commerce


An active pattern set up across South Dakota from August 9th-11th, in which round after round of severe storms and heavy rain developed and moved east. The last round in this series developed in a very moisture-laden environment across eastern South Dakota on Thursday evening, August 11th, and produced very heavy rainfall primarily across Clark, Codington, Hamlin, and Deuel counties. Flooding resulted, with Watertown, SD being among the hardest hit.


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