National Weather Service United States Department of Commerce

Heavy Snow And Hazardous Travel Conditions Expected Over The Rockies, Locally Heavy Rainfall Over The South

Heavy snow and hazardous travel conditions will persist over portions of the central and southern Rockies into Friday before diminishing. A cold front will track eastward bringing the potential for locally heavy rainfall from the south central U.S. to the Appalachians into Saturday. Localized flooding will be possible. Read More >


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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