Flash flood watches are in effect in Southern California because of widespread rain anticipated with the season's first winter storm
Widespread moderate to locally heavy rain is expected across Southern California through Wednesday, prompting the National Weather Service to issue flash flood watches for large portions of the region.A cold low-pressure system arriving from the north will produce the first significant precipitation of the season as it moves directly over the Southland on Wednesday morning and Wednesday afternoon.
When the system is directly overhead, locally heavy cells could develop, resulting in heavy rain and flash flooding, according to the weather service. The highest risk of thunderstorms is from dawn through evening Wednesday, when instability is the greatest. The thunderstorm risk is highest close to the coast in San Diego County, but isolated thunderstorms could occur anywhere west of or in the mountains.
As the storm moves in, temperatures are expected to plunge, and snow levels are now expected to drop to about 5,000 feet. At elevations of 6,000 to 7,000 feet, snowfall could be 6 to 10 inches; above 7,000 feet, 10 or more inches of snow could accumulate. Winter storm warnings are in effect at higher elevations of Inland Empire mountain ranges through Thursday evening.
The storm will gradually move out of the region Thursday and Thursday evening, with warmer, drier conditions beginning to return.
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