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Forecasters warned that isolated thunderstorms were expected to head back to Los Angeles County on Sunday, as monsoonal moisture heads in from Mexico.

“Just about any location from the beach to the mountains and the Antelope Valley will be susceptible to isolated thunderstorms,” the National Weather Service said. “When skies look threatening, move to a safe place.

“When thunder roars, go indoors!” the weather service said.

Forecasters said the sight of lightning should cause people to move into a vehicle or indoors and wait until 30 minutes has passed. Brief heavy downpours are also possible.

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