Strong Winds, Rain to Sweep Across SoCal Thursday Into Friday; Flash-Flood Watches Issued

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San Dimas Public Works Supervisor Terry Gregory clears a clogged drain in January 2016 as heavy rains caused flooding and mud flows in San Dimas, Glendora and Azusa. (Credit: Robert Gauthier / Los Angeles Times)

Powerful winds and rain will sweep across Southern California Thursday, bringing the potential for dangerous mud flows in the foothills of Los Angeles and San Bernardino counties, the National Weather Service said.

Starting early Thursday in San Luis Obispo and Santa Barbara counties, the storm will spread southeast across Los Angeles County and the San Gabriel Mountains, where it’s expected to drop 1 to 3 inches of rain by Friday morning, meteorologist Joe Sirard said.

The National Weather Service issued a flash flood watch for the Santa Monica and San Gabriel mountains and foothill communities in the San Fernando, Santa Clarita and San Gabriel valleys.

Mud flows are possible when it rains more than two-tenths of an inch in 15 minutes, and the incoming storm is expected to drop rain at a significantly higher clip than that, Sirard said.

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