The Southland was targeted by yet another storm Wednesday, with light showers dousing the area in the morning ahead of heavier rainfall that fell Wednesday evening and was forecast to continue into Thursday, strengthened by an atmospheric river suffused with moisture.

Scattered showers increased in intensity as the day rolled on.

The storm was being pushed by an atmospheric river, which National Weather Service meteorologist Kathy Hoxsie described as a moisture-packing air mass. This storm, she said, has “more moisture than others.”

In a briefing early Wednesday afternoon, weather service officials said a flash flood watch will be in effect for “first-year burn areas” and the following conditions were expected through Thursday:

— high surf and significant coastal flooding;

— rain totals of 1-3 inches along the coasts and valleys, with 2-4 inches in the foothills and mountains;

— snow accumulations at the highest resort levels above 8,000 feet; and

— shallow mud and debris flows with some damage possible.

The peak rainfall period in Los Angeles County was expected to be from 5 a.m. to 1 p.m. Thursday. Santa Monica tide predictions of “near 7 feet” are expected on Friday and Saturday mornings, forecasters said.

Between 1.5 to 2 inches of rain was forecast for the Malibu area, enough to cause mud or debris flows, Hoxsie said. The rain was expected to fall over a longer period of time Wednesday, slightly reducing the chances of mud or debris flows, she said. But Wednesday evening, one person was injured when a rockslide sent a boulder slamming into a car.

The slide closed Malibu Canyon Road from Civic Center Way to Piuma Road and the closure was to remain in effect until after dawn Thursday as darkness left crews unable to assess hillsides for the risk of additional slides or flows, according to Malibu Emergency Services.

Residents with identification were being allowed through the road closure at Civic Center Way and Malibu Canyon Road, city officials said.

Several parts of Malibu impacted by November’s Woolsey Fire, which stripped many hillsides bare, are already under mandatory evacuation orders. The orders were issued for specific properties adjacent to steep slopes or at the base of drainages in the following Woolsey Fire burn areas:

— Corral Canyon/El Nido;

— Escondido/Old Chimney;

— Escondido Drive/Latigo Canyon;

— Malibu West/Trancas Canyon;

— Malibu Lake;

— all of Ramirez Canyon Road and adjacent streets; and the

— Paradise Cove Mobile Home Park and Restaurant.

County officials said 225 homes were affected by the orders, but other residents should prepare supplies and be ready to evacuate when ordered.

“Authorities warn that all residents who live in or near the Woolsey Fire burn area should remain aware of their surroundings and weather conditions during these storms. Even small amounts of rainfall rates may result in significant mud and debris flow, so we strongly encourage residents who live in or near Woolsey Fire burn areas to be ready to evacuate at a moment’s notice,” Los Angeles County Sheriff’s Capt. Darren Harris said in a statement.

An estimated 500 homes in the Creek Fire burn area — including Kagel, Little Tujunga and Lopez canyons — were warned to be prepared to evacuate.

Officials said some homeowners whose properties are in particular peril have been alerted and should not wait until a mandatory evacuation order is issued to leave the area. As of 3 a.m. Wednesday, no mandatory evacuations were ordered for the Creek Fire burn area, according to the sheriff’s department.

Supervisor Kathryn Barger told residents who might be worried about looting and hesitant to leave that patrols were already in place in both the Woolsey and Creek fire burn areas.

“We will do everything we can to protect your property,” Barger said, who also urged canyon residents with animals to move them out now to avoid the risk of having to abandon them later. “The lesson learned (at Kagel Canyon) is there is only one way in and out.”

Evacuation centers were open to serve residents from the Woolsey Fire area at Agoura Hills/Calabasas Community Center, 27040 Malibu Hills Road, Agoura; and Santa Monica High School-South Gym, 601 Pico Blvd. For more information, contact the American Red Cross at (800) RED CROSS. Anyone who feels unsafe should call 911.

All Santa Monica-Malibu Unified School District schools in Malibu were closed Wednesday and will remain closed Thursday. The schools are Juan Cabrillo Elementary School, Point Dume Marine Science School, Webster Elementary School and Malibu Middle/High School. The district’s preschool in Malibu and the Boys & Girls Club of Malibu also were closed, officials said.

If a mandatory evacuation order is issued for Kagel, Little Tujunga and Lopez canyons, an evacuation center will be opened in Sylmar. Updated information is available at

Evacuation centers for large animals were opened at Pierce College, 6201 Winnetka Ave., in Woodland Hills; and the Hansen Dam Equestrian Center, 11127 Orcas Ave., in Lakeview Terrace. Small animals, including those with special medical needs, are being accepted at every county-operated animal shelter, as well as the animal safe trailer at 27040 Malibu Hills Road in Agoura.

Snow levels in the mountains are predicted above 6500 feet, likely not affecting the Grapevine, Hoxsie said.

In Orange County, scattered light showers fell Wednesday afternoon, with heavier rainfall coming late Wednesday, weather service meteorologist Jimmy Taeger said. Thursday will bring the heaviest rain before giving way to drier conditions on Friday.

A flash flood watch remains in effect through Thursday afternoon, according to the weather service.

A strong storm cell moved through Orange County Wednesday night, dramatically increasing the amount of rainfall in the region. Roughly 1 1/2 inches of rain fell in parts of Fullerton, Yorba Linda, Anaheim Hills, and 2 inches of rain or more fell in Garden Grove, parts of Anaheim and Huntington Beach, while 3.5 inches of rain was reported in Seal Beach, according to the NWS.

Flooding impacted a mobile home park in Huntington Beach, with water rising to the doorways of some homes. Pacific Coast Highway was closed about 9 p.m. Tuesday in both directions between Warner Avenue and Seapoint Street in Huntington Beach, but was reopened again by about 2:30 p.m. Wednesday, said Caltrans spokeswoman Van Nguyen.

The rain created hazardous conditions on roadways. Just after 11:15 a.m. Wednesday, a woman lost control of a Volkswagen Jetta and slid down a ravine in San Clemente at Camino del Rio and Avenida La Pata. The woman was taken by an Orange County Fire Authority helicopter to a hospital with non-life threatening injuries, said Carrie Braun of the Orange County Sheriff’s Department.

In Laguna Beach, a driver slammed a car into a power pole on Laguna Canyon Road at El Toro Road at 10:10 a.m., said Laguna Beach police Sgt. Jim Cota. Downed power lines forced the closure of Laguna Canyon Road for about two hours.

A big-rig truck overturned in a four-vehicle crash on the Riverside (91) Freeway west of Lakeview Avenue Wednesday morning. The 2010 Freightliner collided with a 2005 Ford in the eastbound lanes, leading to the big-rig to slam though a center divider where its trailer sprawled into the westbound lanes, spilling fuel and oil, according to the California Highway Patrol.

The driver of the Ford was taken to an area hospital to be treated for a complaint of pain, but drivers in two other vehicles that crashed into debris from the collision escaped injury, the CHP reported.

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