A derecho (pronounced dare-ay-show) is a long-lived straight-line damaging wind event caused by a line of severe thunderstorms. Formally, a derecho (pronounced "de-RAY-cho") is a widespread, convectively-induced straight-line wind storm composed of numerous downbursts produced by a group of thunderstorms. For a more comprehensive view of derecho hazards, the "Noteworthy Event" page for the July 4-5, 1980 derecho lists the cause of death or injury for the 73 casualties of that event, providing a typical example of the risks to humans posed by derechos. Residents in the Midwest felt the wrath of a derecho which left widespread damage and more than a million customers in the dark Monday afternoon. Pennsylvania and New Jersey received the brunt of a derecho on June 3, 2020, that killed four people and left nearly a million without power across the mid-Atlantic region. It differs from typical thunderstorm lines by its rapid speed of movement and the existence of highest wind speeds well behind the gust front, rather than at the gust front. Before I get into what they are, let’s discuss the current meteorological circumstances involving this derecho. On August 10th, 2020, a … Derechos are large clusters of thunderstorms that most commonly form in late spring and summer and cause widespread destruction to trees, power lines and sometimes structures. NOAA. The storm also must cause wind damage across an area at least 240 miles (400 kilometers) wide to count as a derecho. This complex system was considered a derecho. Frequency of derecho events in the United States between 1980 and 2001. Winds of … According to the National Weather Service's Storm Prediction Center, a derecho is a severe wind storm that causes a path of wind damage of 250 miles or more and a damage width of 50 miles or more. What is a derecho? 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