Cal Fire crew at Canyon Fire
A Cal Fire crew battles the raging Southern California Canyon Fire earlier this fire season. Courtesy Cal Fire

Deadly roaring “extreme” wildfires could break out around Southern California starting Monday as hot, dry Santa Ana winds were expected to sweep through the region.

Red flag warnings denoting a high danger of wildfire will be in force Monday and through at least Thursday in Los Angeles, Orange and Riverside counties because of strong Santa Ana winds and low humidity, according to the National Weather Service.

This will likely be the strongest and longest duration Santa Ana wind event we have seen so far this season, which runs from late September through April, according to an NWS statement. “If fire ignition occurs, there will be the potential for very rapid fire spread … and extreme fire behavior.”

The strongest of this week’s winds will be Monday and Tuesday, said NWS meteorologist Curt Kaplan.

Santa Ana winds could persist into Friday or Saturday, which would requite that red flag warnings to be extended, the NWS said.

A red flag warming went into effect in the San Gabriel and Santa Monica Mountains at 10 Sunday night and will remain in force at least until 6 p.m. Thursday. At the same time, red flag warnings will be in force in the forests that blanket the San Gabriels — the Angeles National Forest in L.A. County and the Los Padres National Forest in Ventura County.

Over both mountain ranges, the wind will blow Monday at sustained speeds of 20 to 40 mph, gusting to between 45 and 65 mph, said the NWS, adding that wind gusts during the week could reach 75 mph in the Santa Monicas and 80 mph in the San Gabriels. Humidity levels will be very low Monday through Thursday — 5-10 percent in the Santa Monicas and 5-15 in the San Gabriels, according to the NWS.

Additionally, red flag warnings went into force at 3 Monday morning and will last until 6 p.m. Thursday in the San Fernando, Santa Clarita and San Gabriel valleys and the Los Angeles coastal zone, which consists of beach cities, metropolitan L.A., the downtown area and the Hollywood Hills. Northeast winds of between 20 and 35 mph gusting to between 40 and 55 mph are forecast for those areas, although 65-mph gusts are possible in the valleys Monday evening. Also forecast are humidity levels of 15 percent, later Monday falling to between 5 and 10 percent, forecasters said.

A red flag warning will also be in force until Thursday night in both coastal and inland Orange Country, where winds of 20-30 mph gusting to 55 mph are expected, although gusts of 70-80 mph are possible Tuesday and Thursday, according to the NWS. Humidity levels in Orange County will fall to 10 percent Monday but dip to around 5 percent between Tuesday and Thursday.

Wind advisories of varying severity were in effect along with the red flag warnings.

In the Antelope Valley, “a cold Santa Ana wind event” is expected, lowering temperatures to the upper teens and lower 20s Monday evening and Tuesday night, forecasters said.

“…Temperatures may be cold enough to cause pipes to burst,” warned an NWS statement.

But in most of L.A. County, temperatures should be mild this week amid consistently sunny weather. Downtown L.A, for example, is forecast to hit 71 degrees Monday, 73 Tuesday, 79 Wednesday, 80 Thursday, 81 Friday, then 80 Saturday and Sunday. Roughly similar temperatures are expected in inland Orange County.

Temperatures will be about normal in the early part of this week but around 10 degrees above normal by Thursday, Kaplan said.

The NWS forecast sunny skies in L.A. County Monday and highs of 53 on Mount Wilson; 55 in Palmdale and Lancaster; 66 in Avalon; 66 in Saugus; 70 in Long Beach and Woodland Hills; 71 in Downtown L.A., Pasadena and Burbank; and 72 in San Gabriel. Temperatures will increase progressively this week, peaking in the low 80s starting Wednesday.

Sunny skies were also forecast in Orange County, along with highs of 67 in Laguna Beach and San Clemente; 70 in Mission Viejo; 71 in Newport Beach and Yorba Linda; 72 in Irvine; and 73 in Anaheim and Fullerton. Orange County temperatures will reach the low 80s by Thursday.


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