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Significant Severe Weather, Dangerous Heat and Extremely Critical Fire Weather Conditions Across the Southern U.S.

Tornadoes (some strong), extreme hail, and widespread wind damage are forecast over parts of the central and southern Plains Saturday afternoon through Saturday night. A Moderate Risk (level 4 of 5) for severe storms has been issued. Strong winds and low relative humidity will contribute to extremely critical fire weather Saturday in the Southwest. Dangerous heat continues in South Texas. Read More >

Overview

On the evening of July 11th, strong storms developed along a front and tracked across parts of eastern South Dakota. The strongest storms produced large hail and damaging winds. The hardest hit area was around Watertown, SD where hail the size of baseballs fell. There was also a 75 mph wind gust recorded at the Watertown Regional Airport, as well as locally torrential rainfall.

Image
Left: Severe Thunderstorm Reports from http://www.spc.noaa.gov/climo/gmf.php?rpt=170711_rpts_filtered

Right: Cloud-to-ground lightning strikes. Data courtesy of Vaisala - U.S. National Lightning Detection Network

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