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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 June 29, 2018, two supercells moved across northeastern Wyoming and western South Dakota. In addition to producing very large hail, the southern supercell spawned a tornado with a continuous path from southeast of Sundance eastward to Spearfish Canyon. The majority of damage occurred in wooded areas, with widespread snapped trees observed throughout the tornado path. Some structural damage was also observed southeast of Sundance, just east of Highway 585, near the beginning of the tornado's path. Based on the damage, maximum winds were estimated to be 105 mph, giving the tornado an EF-1 rating.

 

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