National Weather Service United States Department of Commerce


During the afternoon of Monday, August 14th, thunderstorms developed over the northern Black Hills. They gradually merged into a powerful supercell, which moved directly over Rapid City, bringing heavy rain, large hail, and damaging winds. The hail and winds damaged vehicles, gardens, and other property, and runoff from the heavy rain caused flooding. Meanwhile, more storms developed to the southeast of this storm. As the supercell tracked southeastward, a long duration of heavy rain resulted in flash flooding in Oglala Lakota county. Around Sharps Corner, flooding along Porcupine Creek washed out roads and stranded residents and travelers. Additional thunderstorms expanded over the area during the evening. Below are several pictures we received, a radar loop depicting the storms, and a list of significant reports. 


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