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Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

Overview

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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