Houston weather: Severe Thunderstorm Watch issued for counties north of Houston-area

HOUSTON - The National Weather Service in Galveston has issued a severe thunderstorm watch for several counties north of the Houston-metro area. 

The following counties are under the watch: Grimes, Polk, San Jacinto, Trinity, and Walker County. 

The watch is in effect until midnight Friday. 

A severe thunderstorm watch means conditions are favorable for severe thunderstorms to develop over the watch area. 

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