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A MOIST AND UNSTABLE AIR MASS WILL REMAIN IN PLACE ON SUNDAY...
BRINGING A STRONG THREAT OF AFTERNOON AND EARLY EVENING THUNDERSTORMS
TO THE MOUNTAINS AND DESERTS OF SOUTHERN CALIFORNIA. DUE TO THE WEAK
UPPER LEVEL WIND FLOW...STORMS ARE EXPECTED TO BE VERY SLOWING
MOVING...CAUSING A HIGH THREAT FOR FLASH FLOODING.