National Weather Service United States Department of Commerce

Powerful Storm to Impact Eastern Third of U.S. this weekend.

A developing storm system will bring a myriad of significant impacts this weekend. Heavy snow up to 18 inches from the Ohio Valley to the Northeast, and ice up to a quarter of an inch is forecast in places. Heavy rain may cause flash flooding from the Mid-South to the Mid-Atlantic. Severe thunderstorms with damaging winds and isolated tornadoes will be possible in the Deep South. Read More >

Overview

During the afternoon and evening of July 21, 2018, scattered thunderstorms produced large hail and damaging winds across portions of the Black Hills, northeastern Wyoming, and southwestern South Dakota. Additionally, near-record high atmospheric moisture content for the area, coupled with saturated soils from an anomalously wet spring and early summer, led to flash flooding across portions of the Black Hills and in Rapid City.

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