Flash flood watch issued for San Diego mountains, deserts - CBS News 8 - San Diego, CA News Station - KFMB Channel 8

Flash flood watch issued for San Diego mountains, deserts

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SAN DIEGO (CNS) - More heavy rain was expected in the San Diego County mountains and deserts Saturday, as parks officials near Borrego Springs said flash floods have washed out some roads.

Downpours from thunderstorms caused some flooding on roads in the Fish Creek area of Anza Borrego Desert State Park. Spokeswoman Sally Theriault said park visitors were advised to stay off those washed out, muddy roads.

A midday storm Friday dropped .92 inches of rain on Santa Ysabel, 0.82 inches in Ocotillo Wells. 0.63 inches in Ranchita and about a quarter-inch on Mount Laguna. The storm also dropped 1.1 inches of rain in Thermal, at the north end of Salton Sea.

Thunderstorm clouds were expected to build up over the mountains throughout Saturday, and might get big enough to cause dangerous flash flooding in some areas, said National Weather Service forecaster Mike Watkins.

Residents in affected areas should be aware and monitor the forecast. "Flash flooding is very dangerous and kills more people than anything else in weather," Watkins said.

Residual moisture, afternoon heat and weak winds could support the storms' development Saturday afternoon. The slow moving storms could drop very heavy rain which could lead to flash flooding on desert mountain slopes and adjacent desert areas, the weather service said.

Mud and debris flows in recently burned areas or on steep terrain could block vehicles or make travel difficult on mountain roads, the weather service said.

Excessive runoff from the thunderstorms could produce flooding in normally dry creeks and washes. Runoff from higher mountain slopes could lead to dangerous flash flooding far downstream from the heaviest rainfall.

The National Weather Service issued a flash flood watch, set to remain in effect through Saturday evening, which means conditions could develop that lead to flash flooding.

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