Rain, wet roads, sporadic flooding and mountain snow were the order of the day across the Southland Monday as the first major storm of the season brought a taste of winter to the region.
Rain fell seemingly throughout the night in some parts of the basin and continued off and on throughout the day, with sometimes heavy downpours causing localized flooding and raising fears of debris flows in recent burn areas.
By late afternoon, downtown Los Angeles had received about an inch and a half of rain, while Culver City recorded 1.7 inches, according to the National Weather Service. Most of the area received more than an inch of precipitation over a 24-hour period.
For those looking for a trip to the mountains, Mountain High received more than 10 inches of snow, while Pine Mountain had about 6 inches. Lower-elevation Frazier Park received about 4 inches.
There were reports of some flooding overnight, including on the San Bernardino (10) Freeway in El Monte, and with heavy downpours continuing throughout the day, the National Weather Service issued a flood advisory for Los Angeles County through 6 p.m.
Forecasters also warned of a continued possible threat of debris slides in recent burn areas, saying some areas could get brief downpours that could trigger slides, particularly later in the day.
“The threat for significant and damaging debris flows is small, but not zero,” according to the NWS.
Los Angeles County lifeguards reported the “rare sight” of slush and hail on the sand in Manhattan Beach, warning that storm water being carried to the coast can lead to significant beach erosion, while also carrying substantial pollutants to the ocean. That flow of pollutants prompted the Los Angeles County Department of Public Health to issue a Beach Water Use Advisory, urging people to avoid entering the ocean for swimming, surfing or other activities near discharging storm drains or creeks. The advisory will remain in effect until at least 7 a.m. Thursday.
Some parts of the Southland, including Norwalk, also received an unusual pelting with hail.
“Numerous showers with isolated thunderstorms will continue into this evening,” according to the NWS. “Isolated rain rates around 0.50 inches per hour are likely, which can produce minor debris flows over most recent burn areas, especially over Los Angeles County. Gusty winds and small hail are possible anywhere near thunderstorms, and in the mountains.”
Temperatures stayed relatively chilly throughout the day, with most areas struggling to reach the 60s.
Los Angeles County issued a cold weather alert through Wednesday for Lancaster, through Tuesday for Mount Wilson, and for Tuesday and Wednesday in the Santa Clarita Valley. County officials noted that those areas could see near-freezing or below-freezing temperatures at night.
The Los Angeles County Department of Public Health urging people in the area to:
— wear layers of warm clothing if they plan to be outdoors;
— wear a hat, scarf, gloves and socks to protect their head, hands and feet;
— check in frequently with family, friends and neighbors who have limited mobility or access to heat; and
— bring pets inside and do not let them stay outside overnight.
The storm system should mostly move out of the region by Tuesday, and forecasters said gusty winds are expected Tuesday through Friday, bringing gusts of up to 50 mph to particularly wind-prone areas. Humidity levels will also drop in some mountain and lower-elevation areas. But thanks to the rain, the region will likely avoid any red-flag warnings of severe fire danger, but “pockets of two to four hours of critical weather conditions are possible.”
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