Southern California’s first major rainfall arrived Saturday night and the wet weather is expected to continue through Monday.
Heavier rains and thunderstorms are expected on Sunday afternoon, with the highest rain totals hitting Los Angeles County and the eastern San Gabriel Mountains, according to the National Weather Service.
A Flood Watch will be in effect from Sunday at 10 a.m. through Monday at 4 p.m., with threats of flash flooding and debris/mud flows especially concerning for recent burn scar areas from the L.A. wildfires.
Up to an inch of rain is expected throughout parts of L.A. and Ventura counties beginning Saturday night, NWS said.
A 15-25% chance of thunderstorms could also bring gusty winds and small hail to some communities.
Communities in the San Bernardino County and Riverside County mountains are under a Winter Storm Warning from Saturday night through Monday afternoon at 4 p.m.
Snowfall is expected at elevations above 3,500 feet with three to eight inches of snow for most mountain areas. Wind gusts of up to 55 mph will cover the region through Sunday morning.
“Roads, especially bridges and overpasses, will become slick and hazardous,” NWS warned. “Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning commute.”
Crews have been working all week to load sandbags and clear streets in case of mudslides.
“Streets may be flooded or blocked by debris, and some high-risk properties in recent burn areas may be advised to evacuate,” L.A. County officials said Saturday night.
Officials said the likelihood of mudslides increased after the fire burned down to the roots of the foothill plants and trees, leaving nothing to hold back the soil.
Drivers who must travel during stormy weather are advised to keep an extra flashlight, food, and water in their vehicle in case of an emergency. The latest road conditions can be obtained by calling 511.
“If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility,” NWS said. “Leave plenty of room between you and the motorist ahead of you, and allow extra time to reach your destination. Avoid sudden braking or acceleration, and be especially cautious on hills or when making turns. Make sure your car is winterized and in good working order.”