A thunderstorm over Julian in July. Photo from Volcan Mountain via UCSD HPWREN camera

Thunderstorms and flash flooding are possible on Monday in the mountains and deserts of San Diego County.

The National Weather Service office in San Diego issued a flash flood watch beginning at 10 a.m. and continuing into the evening for Julian, Pine Valley, Borrego Springs and surrounding areas.

“Confidence is high that scattered heavy thunderstorms will occur in the mountains and deserts today, leading to localized flash flooding,” the weather service said.

There’s a chance that showers could drift over the inland valleys, but the weather along the coast will be warm and sunny for Labor Day.

The forecast calls for patchy fog in the morning then highs of 76 to 81 near the coast, 83 to 88 inland and 89 to 94 in the inland valleys.

The chance of thunderstorms will continue each afternoon through Thursday.

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