Tropical Storm May Trigger Thunderstorms, Flash Floods

By City News Service

An influx of moisture from the remnants of Tropical Storm Ivo may trigger showers and thunderstorms in Southern California Monday, raising the threat of flash flooding in the Antelope Valley and the San Gabriel Mountains, forecasters said.

Any storm that develops Monday will be slow-moving, according to a National Weather Service advisory.

"As  result, there is a potential for heavy rainfall and flash flooding. In addition, there will be a threat of debris flows below recently burned areas," it said.

A flash flood watch will be in effect from 1 p.m. through Monday evening in the Antelope Valley and the San Gabriel Mountains in Los Angeles County. Showers are expected elsewhere in the region, especially this evening.

"Excessive runoff from heavy downpours may cause rapid filling and overflowing of normally dry washes and small creeks and low-lying areas," the advisory warned. "In addition, there will be a threat of mud and debris flows if thunderstorms affect recent burn areas ..."

The NWS forecast highs today of 77 in Avalon; 79 at LAX; 80 in Newport Beach; 82 on Mount Wilson; 88 in Long Beach, 89 in downtown L.A.; 91 in Anaheim; 93 in Palmdale; 94 in San Gabriel and Lancaster; 95 in Burbank and Pasadena; 98 in Saugus; and 99 in Woodland Hills.

Other than the precipitation, partly cloudy skies were forecast for Monday, turning mostly cloudy Tuesday before a return to sunny skies Wednesday.