Big rig trucks stopped along Interstate 8 during high winds in 2017. Photo by Chris Stone

 A wind advisory for the San Diego County mountains and deserts has been extended until midnight Thursday evening, the National Weather Service said.

West winds of 20 to 30 mph, with gusts to 55 mph, were expected. They were expected to be strongest through sunrise, then again Thursday evening.

The original advisory had been expected to expire at 6 a.m. Thursday.

The advisory warns that high wind speeds could blow down tree limbs and knock down power lines, potentially causing outages.

Drivers were advised to use extra caution — especially if operating a high-profile vehicle.

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