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Thursday's Storm Officially Classified As A Derecho

The 250-mile-line line of severe thunderstorms that tracked through the Deep South Thursday has officially been classified as a derecho.

Posted: Jun 29, 2018 4:48 PM

The National Weather Service in Huntsville has officially classified the line of storms that slammed the Tennessee Valley on Thursday as a "derecho."

A derecho is a long-lived straight-line wind storm associated with a line of severe thunderstorms that is at least 250 miles long. Winds of at least 58 mph have to be happening along most of that 250-mile-long line for a storm to be considered a derecho. Winds can be stronger than 100 mph with exceptionally strong derechos.

At least one area of 100 mph winds was noted in the damage surveys conducted by the National Weather Service.

Derecho is a Spanish term that means "straight ahead." That refers to the straight-line wind nature of the of the storm. The usage of the term goes back to 1888, according to information from the Storm Prediction Center. 

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