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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

Severe thunderstorms with large hail and strong winds moved across northeastern Wyoming and western South Dakota Wednesday evening (June 26, 2019). By late evening, the storms began to move rapidly to the northeast around 40 mph across northwestern South Dakota, producing damaging winds and causing power outages. As the main part of the rain was concentrated over northwestern South Dakota, an outflow boundary from the storms moved rapidly to the south. As the boundary approached the Black Hills, the winds rapidly increased from the north and northwest. Wind gusts of 55 mph to 65 mph were reported shortly before midnight across the foothills and plains on the eastern side of the Black Hills around Rapid City. It is fairly unusual to get winds this strong this far ahead of thunderstorms. A heat burst also occurred across south-central South Dakota.

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