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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

The afternoon of Sunday, July 30th began with a potent supercell that developed over the Black Hills, dropping baseball sized hail at Pactola Reservoir. As it moved southeastward, over 3 inch hail fell along the Flume Trail. The storm quickly dissipated as it moved off the Black Hills. More severe thunderstorms developed across northeastern WY later in the afternoon and evening, resulting in golf ball sized hail and up to 80 mph winds. The storms expanded into western SD during the evening.

24-hour Lightning Map ending 12z July 31, 2023
Here is the 24-hour GLM lightning map from 6 am MDT (7/30) to 6 am MDT (7/31).

 

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