Houston has been hit by rounds of floods and tornadoes. When does Texas severe weather end?
SEVERE WEATHER: Map shows 2 tornadoes' path of destruction through Houston ... that can help to spark thunderstorm formation.
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The National Weather Service says a derecho storm caused the damage in SE Texas. Here's what that means
The powerful storm also killed at least seven people in Houston ... derecho if the wind damage swath extends more than 240 miles and has wind gusts of at least 58 mph along most of the storm's path.