ORANGE COUNTY – After a week of generally above average temperatures, rain fell across much of Southland on Monday, leading to wet morning driving and raising concerns about possible flooding in the hills of Orange County.
Flooding fears prompted Orange County to issue an evacuation warning for the Silverado, Modjeska and Williams canyon areas. Before the last update at 4 p.m. Monday, the three aforementioned canyon areas were under mandatory evacuation orders before finally demoting to evacuation warnings.
The National Weather Service has issued a flash flood watch for the Bond, Apple and El Dorado fire scorch areas, which include Silverado, Modjeska and Williams canyons. Forecasters said heavy rain is possible in mountainous areas and nearby residents “should be prepared for potential flooding impacts”.
“Heavy rains could trigger flash flooding in low-lying areas, flooding on urbanized streets and debris flows in and near recent wildfire burn scars,” according to the NWS.
The flash flood watch is expected to remain in effect until Monday evening.
Forecasters said the storm will persist over the region through Tuesday morning, “bringing widespread rain, snow at high altitudes and gusty winds. There will also be a risk of thunderstorms capable of producing heavy downpours. and small hail later this morning through tonight.”
Light rains fell on coastal areas early Monday, gradually increasing in intensity until the morning rush hour and spreading eastward. Forecasters said rainfall rates were generally less than an inch per hour in most areas of Los Angeles County.
Wind advisories will be in effect until 10 p.m. in Antelope Valley, Santa Monica Mountains Recreation Area and Santa Clarita Valley. Forecasters said the areas could see winds of up to 50mph, which could make driving difficult for large vehicles and potentially lead to falling tree branches or power outages.
A winter storm warning will be in effect for the mountains of Los Angeles County, excluding the Santa Monica Range, until 6 a.m. Tuesday.
According to the NWS, 6 to 12 inches of snow could accumulate in the mountains above 6,000 feet, with 18 inches possible at 7,500 feet and higher – with winds of up to 60 mph.
Most of the weather system is expected to leave the region early Tuesday morning, “but there could be lingering (mountain) downpours into the morning.”
Drier conditions are expected later Tuesday and Wednesday, with a “slight” chance of some more rain Thursday, followed by warmer conditions Friday and Saturday.
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