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Lightning storms were moving westward over San Bernardino, Riverside and San Diego counties Saturday and were expected to extend into Los Angeles County by the evening, forecasters said.

Cloud-to-ground lightning was expected at San Diego County beaches around midday Saturday, according to the National Weather Service. The agency also issued a flood advisory for central Riverside County for midday Saturday, as a complex network of thunderstorms moved slowly through an area between Palm Springs, Idyllwild and Banning.

The thunderstorms could extend into the Los Angeles Basin and the San Gabriel Valley through Sunday evening. Such isolated weather systems could produce “heavy downpours, gusty winds and deadly lightning,” the weather service said.

One person was killed and several others injured by lightning strikes at Venice Beach and on Catalina Island last Sunday during an unusual summer thunderstorm.

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