"Already, early on Christmas morning, a line of severe thunderstorms moved into Northern California with wind gusts in excess of 70 mph, setting off flash flooding in the San Francisco metro. A moderate Level 3 of 4 risk of excessive rainfall is in effect for much of Southern California, including Los Angeles, as several more inches of rain are expected in the mountains north of the city and another 2 to 4 inches of rain in the city."
"While rainfall Thursday and Friday will be less than what fell on Christmas Eve, any new rain could result in flooding because the ground is already saturated. Mudslides, rock slides and debris flows are again a threat on Christmas Day, particularly in areas where burn scars are present from recent wildfires. The scorched ground of these scars repels water instead of absorbing it, quickly turning rain into a surge of floodwater that pulls mud and debris with it."
Powerful storms struck California over Christmas Eve and Christmas Day, producing severe thunderstorms with wind gusts over 70 mph and flash flooding in Northern California. A Level 3 of 4 risk of excessive rainfall covers much of Southern California, with mountains north of Los Angeles expected to receive several more inches and the city another 2 to 4 inches. Earlier storms delivered 5 to more than 10 inches in mountain areas and 2 to 5 inches at lower elevations. Saturated soils increase flood potential, and burn scars repel water, heightening mudslide, rock slide and debris-flow risks. State and local emergencies were declared to mobilize resources.
Read at www.mercurynews.com
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