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Heavy Rain in the Ohio and Tennessee Valleys; Watching for Tropical Cyclone Development in the Atlantic

Heavy to excessive rainfall may bring areas of flash and urban flooding over portions of the Ohio and Tennessee Valleys. Two tropical waves in the Atlantic are being monitored for tropical cyclone formation within the next few days. One tropical wave will bring periods of heavy rain, thunderstorms, flood risk, and landslides to Puerto Rico and the US Virgin Islands through Friday morning. 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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