The National Weather Service has issued another rare Particularly Dangerous Situation warning in anticipation of Monday’s powerful and potentially damaging Santa Ana wind event.
The NWS announced on X that the PDS warning for Los Angeles and Ventura counties will take effect Monday at 12 p.m. and remain in place until Tuesday at 10 a.m. The NWS urged the public to prepare accordingly.
According to the NWS, the wind event is expected to develop quickly on Monday, starting in the mountains of L.A. County in the afternoon and spreading into the valleys and coastal areas by evening or early Monday night.
The NWS said there is the potential for wind gusts up to 60 to 80 mph could affect the L.A. and eastern Ventura County mountains Monday night and Tuesday morning, with gusts 55 to 65 mph possible at many valley and coastal areas of these two counties.
Red Flag Warnings to take effect Monday
Combined with humidity lowering significantly to the single digits, a Red Flag Warning has been issued for much of Ventura and Los Angeles counties from late Monday morning through Tuesday evening, including in Pasadena, where the alert will take effect at 8 a.m. Monday through 6 p.m. Tuesday. Parking restrictions have also been put in place there. More information can be found here.
The NWS said these conditions will create “dangerous” fire weather conditions. “New or existing fire ignitions will have a high risk for very rapid fire spread and extreme fire behavior with long range spotting,” the NWS added.
“The most critical days will be Monday and Tuesday, and then Wednesday, Thursday, and Friday, we still are going to see gusty winds, they just won’t be as strong as they will be for the next 48 hours,” said KCAL9’s Meteorologist Marina Jurica.
Jurica said, by 10:40 a.m. on Monday, gusts of up to 60 mph in portions of Santa Clarita Valley, channeling down into Ventura County, western Los Angeles County, moving over into the San Gabriel and San Bernardino County Mountains.
“Like what we saw a couple of weeks ago, winds do create more speed as they move down slop and those down slopping winds we are going to have to really watch for,” Jurica added.
Fire Weather Watch
Gusty offshore winds and very low humidity will continue later Tuesday night through Thursday in these same areas. The strongest winds during this period are expected to be Wednesday night into Thursday morning with gusts in the 40 to 55 mph range. Due to the potential for continue Red Flag conditions, a Fire Weather watch has also been issued for most of these areas from late Tuesday evening through Thursday evening.
High Wind Watches
In addition, High Wind Watches will be in effect late Monday afternoon through Tuesday morning for Ventura and parts of Los Angeles counties due to a “high risk of widespread damaging winds,” according to the NWS.
By Friday, an upper low may bring a chance of light rain and mountain snow, along with cooler temperatures.
Moderate to strong gusts could cause downed trees, power outages and dangerous sea conditions.
Los Angeles County areas of greatest concern:
- Calabasas and Agoura Hills
- I-5 Corridor
- Western San Fernando Valley
Ventura County areas of greatest concern:
- Ventura County mountains
- Valleys
- Western Santa Monica mountains
Roads closed
On Sunday evening, with just hours until strong winds were expected to begin battering Los Angeles County, Caltrans District 7 officials announced that SR-27, also known as Topanga Canyon Boulevard, would be closed between Mulholland Drive and Grand View Drive.
The area is one of many that will be impacted by strong winds that could reach between 70 and 100 miles per hour with the PDS warning in place.
The closure begins at 10 a.m. Monday and lasts until the red flag conditions expire, officials said.
Preemptive moves in place
Gov. Gavin Newsom deployed additional resources to Southern California on Sunday with the third PDS forecast in three weeks incoming.
In anticipation of the high-powered winds that could reach 100 mph in some regions,, Newsom prepositioned 170 fire engines, water tenders, personnel and aircraft to the area, according to a statement from the governor’s office.
“The recent firestorms in Los Angeles have illustrated the importance of being in the right place at the right time,” said a statement from Newsom. “By strategically placing specialized personnel and equipment in areas prone to wildfires, crews are able to respond faster and more aggressively. These conditions are dangerous, so it’s incumbent upon all families to stay vigilant.”
The additional resources will be prepositioned throughout Southern California, joining the more than 790 firefighting personnel that were put into action by Cal Fire. That includes 76 engines stationed throughout Los Angeles, Ventura, San Bernardino, Riverside, San Diego and Kern counties ahead of the wind.
Cities take action
As with the last red flag warnings, the city of Pasadena has placed a series of parking restrictions in place starting Monday.
The restrictions go into effect at 8 a.m. and last at least through 6 p.m. on Tuesday. They will be active along “posted narrow and/or winding roads within Pasadena’s urban-wildland interface areas,” said a statement from the city.
Vehicles found in violation will be cited and towed.
A full list of street closures can be found here.
