National Weather Service United States Department of Commerce

Overview

An area of low pressure and cold front moved through the Northern Plains during the afternoon and evening hours of August 12, 2019. This storm system, combined with above average water in the atmosphere, created numerous thunderstorms across most of western South Dakota. Runoff from the heavy rain caused flash flooding and flooding across portions of Oglala Lakota County. Three to five inches of rain was reported between Porcupine, Sharps Corner, and Kyle. A large amount of the precipitation fell over Iron Cloud Canyon, causing flash flooding of BIA 27 between Evergreen and Gooseneck Road. Several feet of fast moving water inundated BIA 27 and caused significant flooding of Porcupine Creek. As the flood waters continued along Porcupine Creek, BIA 2 just east of Sharps Corner was inundated this morning (August 12th). Additional flooding along Porcupine Creek is expected downstream to the White River.

 

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