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.
- Thursday's Storm Officially Classified As A Derecho
- Comey invited to speak at classified Senate Russia hearing
- Ex-CIA contractor pleads guilty to keeping classified info
- WHO classifies 'gaming disorder' as mental health condition
- Ex-CIA worker charged with disclosing classified information
- Former intelligence analyst charged with leaking classified docs to reporter
- Warm with isolated storms Thursday
- WikiLeaks founder indicted on charges of 'unlawfully obtaining' and disclosing classified information
- Storms to bring damaging winds Thursday morning
- Damaging wind threat with severe storms Thursday