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Major Storm Pounding California; Winter Weather Threats Through This Weekend From the Central to Eastern U.S.

The last and strongest in a week-long parade of Pacific storms is pounding California with a variety of hazards, including heavy rainfall, mountain snow and flooding near recent wildfire burn scars. Meanwhile, a weak, progressive system may produce light snow from the Ohio Valley into the northern Mid-Atlantic region through early Friday. Then a major winter storm will develop for the weekend. Read More >

Overview

On the afternoon of July 17th, 2018, thunderstorms developed over the Black Hills. Some of these storms became severe, producing large hail and damaging winds. However, the main issue with these storms was a significant amount of small hail, covering the roads and making travel difficult. Snow plows were needed to clear inches of hail from the roads. Additionally, heavy rain caused flash flooding, which was exacerbated by hail-covered roads. The storms over the Black Hills eventually moved southeast onto the plains. More thunderstorms moved into northeastern Wyoming, becoming severe and producing large hail and strong winds. Heavy rain with these storms also produced flash flooding. These storms merged to form one storm system (what meteorologists call a mesoscale convective system, or MCS), and spread into South Dakota. 

 

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