Fierce Santa Ana winds blew across the Southland Thursday amid very low humidity, raising fears of wildfires.

A red flag warning issued by the National Weather Service and denoting critical fire weather conditions went into effect at 3 a.m. Thursday in the Santa Monica Mountain Recreational Area, the San Gabriel Mountains, the Angeles National Forest, the San Fernando, San Gabriel and Santa Clarita valleys, Los Angeles, including the coast, metropolitan L.A., Downtown L.A. and the Hollywood Hills, and much of Ventura county.

In the mountains, northeast winds blew at sustained speeds of 25-45 miles per hour, gusting at 75 miles per hour, according to the NWS. In the San Fernando and Santa Clarita valleys, northeast winds blew at speeds of 20-35 mph, along with 55-mph gusts. And in Los Angeles and the San Gabriel Valley, northeast winds of 20-30 mph were reported, along with 50-mph gusts.

The strongest winds were expected from mid-morning to mid-afternoon Thursday, and again Friday morning, amid humidity levels of 3-10 percent and very dry vegetation providing potential wildfire fuel, the NWS reported, adding it may be necessary to extend the red flag warning into Saturday.”

“If fire ignition occurs, conditions will be favorable for extreme fire behavior, which would threaten life and property,” the NWS warned.

Also in force Thursday — until 6 p.m. Friday — is a red flag warning in inland Orange County, including the Santa Ana mountains, with forecasters warning of east-to-northeast winds of 20 to 35 mph, gusting to 50 mph, with isolated 70-mph gusts in mountain areas.

The Los Angeles County Fire Department and the California Governor’s Office of Emergency Services have pre-positioned additional firefighters and equipment in areas identified as having elevated risk of wind-driven wildfires.

Residents are reminded that 90% of wildfires are caused by human activity and are asked to call 9-1-1 at the first sign of smoke or fire, the L.A. County fire Department said in a statement. It invited residents to consult its website at for steps on how to prepare and safely evacuate well ahead of a wildfire.

Southern California Edison, meanwhile, cautioned that thousands of customers throughout its service area could lose power due to “Public Safety Power Shutoffs” aimed at reducing fire risks. The shutoffs are conducted during extreme fire conditions — de-energizing power lines that might be damaged in high winds and spark wildfires. Nearly 174,000 customers are in areas that are “under consideration” for power cuts.

In Los Angeles County, there are roughly 49,000 customers facing possible cuts, primarily in the northern reaches of the county such as Lancaster, Palmdale, Santa Clarita and areas such as Acton, Agua Dulce, Lake Hughes and Canyon Country. La Crescenta/Montrose, Malibu, Chatsworth and San Fernando are also in the potentially affected area.

In Orange County, about 7,250 customers in Rancho Santa Margarita, Orange and North Tustin are in potential power-cut areas.

Malibu officials said earlier this week that SCE had given the city a 48-hour notice that a Public Safety Power Shutoff may be implemented that could affect Western Malibu beginning at 9 p.m. Thursday and continuing until 9 a.m. Friday. The city urged people who are medically dependent on electricity service to consider staying in another area until conditions change.

Edison urged residents to check on family members and neighbors who may need assistance in case of a power outage. If a PSPS is implemented, once hazardous conditions have passed it could take 24 to 72 hours to re-energize circuits because SCE must first inspect all power lines in the affected area to ensure they are safe to re-energize.

Along with the red flag warning, a high wind warning was in effect until 3 p.m. Friday.

“Damaging winds may blow down trees and power lines. Widespread power outages are possible. Travel will be difficult, especially for high profile vehicles,” the NWS warned. “Use extra caution when driving, especially if operating a high-profile vehicle. Secure outdoor objects.”

Additionally, “people should avoid being outside in forested areas and around trees and branches. If possible, remain in the lower levels of your home during the windstorm, and avoid windows. Use caution if you must drive.”

In the Antelope Valley, a freeze watch will be in force from late Thursday evening through Friday morning, with temperatures as low as 28 degrees expected.

The NWS forecast sunny skies in L.A. County Thursday and highs of 63 on Mount Wilson; 69 in Palmdale; 70 in Lancaster; 73 in Saugus; 76 in Avalon; 79 at LAX; 80 in Burbank and San Gabriel; 82 in Pasadena, Woodland Hills and Downtown L.A.; and 83 in Long Beach. Temperatures will rise three or four degrees Friday before reverting to Thursday’s levels on Saturday.

Sunny skies and windy conditions were forecast in Orange County, along with highs of 59 on Santiago Peak; 71 on Ortega highway at 2,600 feet; 78 in Fremont Canyon and Trabuco Canyon; 81 in Newport Beach, Laguna Beach and San Clemente; 82 in Mission Viejo; 83 in Yorba Linda and Fullerton; and 84 in Irvine and Anaheim. Temperatures will mostly dip slightly Friday and Saturday and drop a few degrees more on Sunday.

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