Triple-digit heat expected in parts of county

SAN DIEGO — Triple-digit temperatures are expected to prevail in the inland valleys of San Diego County Friday while scattered thunderstorms capable of triggering flash flooding threaten the mountains and deserts.

Hot WorkerThe National Weather Service issued a heat advisory for the inland valleys until 7 p.m., saying highs today would range from 97 to 107 degrees.

“High temperatures can cause heat-related illness,” the NWS said. “Those without air conditioning, those working or playing outdoors, the elderly, the young and those working with existing health conditions will be most vulnerable.”

In the mountains and deserts, a subtropical air mass will continue to linger today, making scattered thunderstorms capable of producing heavy rainfall possible, according to the weather service.

A flash flood watch for the mountains and deserts is scheduled from noon to this evening.

“A flash flood watch means that conditions may develop that lead to flash flooding,” the NWS said. “Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action.”