Scattered showers moved into Southern California Tuesday, kicking off a series of late-winter storms expected to bring heavier rainfall Wednesday and Thursday and lingering into Friday.
With Los Angeles County facing substantial rain for the next two days, officials were issuing evacuation warnings and “address specific” evacuation orders in places vulnerable to mudslides, including recent burn areas, the Los Angeles Fire Department announced Tuesday.
The orders will be in effect from 7 a.m. Wednesday to 6 p.m. Thursday.
Fire officials said the following burn areas were “especially susceptible to heavy rain”:
— Palisades Fire: Getty Villa area, Highlands near the burn areas, Bienveneda area near Temescal Canyon Park, Rivas Canyon/Will Rogers State Park area, Mandeville Canyon above Tanners Road, Old Ranch Road and Rustic Creek;
— Sunset Fire: East and south of Runyon Canyon;
— Hurst Fire: Olive Lane in the Oakridge Mobile Home Park;
Houses in the warning area with high risk were being visited by the Los Angeles Police Department on Tuesday to receive specific evacuation orders. If residents are not home, the department was leaving a flyer with relevant information.
Additionally, Caltrans will close a segment of Pacific Coast Highway to residents and businesses in burn scar areas at noon Wednesday due to safety concerns from the incoming storm. Only emergency vehicles and U.S. Army Corps of Engineers debris-hauling contractors will be allowed through the closure.
Residents with homes in the burn scar area should consider alternate routes in the afternoon hours or consider teleworking if possible, officials said.
Caltrans and other officials will reassess the situation Thursday to determine if the highway can reopen to residents and businesses with passes by Friday for morning commute, if not earlier. That decision is dependent on the extent of the storm and resulting impacts of any debris flows.
LA County Public Works crews have prepared debris basins, stabilized slopes, and reinforced drainage systems to reduce flood risk, particularly in recent burn areas including Eaton, Palisades, Bridge, Hurst, Kenneth, Hughes, Sunset, Lidia and Franklin, officials said.
“While these efforts reduce flood risk, the storm could still bring moderate debris and mudflows to burn areas, potentially blocking streets and threatening structures depending on their location and the local terrain,” the department said.
“To mitigate potential impacts, LA County Public Works has activated 24/7 storm patrols and remains fully mobilized,” officials added.
Through Tuesday night, rainfall was expected to range from one-third to two-thirds of an inch from the coast to the mountains with local amounts exceeding one inch in the mountains, the National Weather Service said.
A cold front will move over the area overnight Wednesday into early Thursday, bringing a storm with potential flooding.
“Lighter precipitation will develop on Wednesday with the with the most likely time for more widespread and heavier precipitation with the cold front for late Wednesday night into Thursday morning,” the NWS said.
Rainfall is expected to range from 1 to 2 inches along the coast and in valley areas and 2 to 4 inches in the foothills and mountains. Rainfall rates could reach up to .75 inches per hour.
This system will also likely be the biggest snow maker of the season, with 1 to 2 feet of snow forecast for higher elevations.
“Steady rain will turn to showers Thursday. The snow levels will drop to around 3,000 ft and a few inches of snow is possible over the Grapevine and other lower elevations passes,” the NWS said.
Stronger, gusty southwest to west winds will develop Wednesday night and continue through Thursday night, the NWS said.
Cooler temperatures are expected all week, with daytime highs dropping to around 60 degrees in downtown Los Angeles on Tuesday and Wednesday and around 55 on Thursday and Friday. Overnight lows will generally be in the 40s and lower 50s, but will drop into the 30s on Thursday and Friday in the mountains and the Santa Clarita and Antelope Valley.
A weaker storm system moving inland to the north on Friday could keep some showers going into Friday night, according to forecasters. However, things dry out and warm up for the weekend.