Red flag warnings, signaling a high potential for wildfires, are in effect for Southern California on Saturday, November 19, as strong gusts of wind whip through the region.
The warnings were issued for Orange, Los Angeles, Riverside and San Bernardino counties, the National Weather Service said.
A ⚠️Red Flag Warning will remain in effect until 10:00 p.m. for Orange/San Bernardino/Riverside counties. Very strong winds appearing over the mountains/coastal slopes this morning. Relative humidity levels decrease as temperature rises, leading to critical fire weather conditions. #CAwx pic.twitter.com/OFaFEZsHpu
— NWS San Diego (@NWSSanDiego) November 19, 2022
The Riverside County Fire Department reported that a two-acre wildfire in the area of Clay Street and Van Buren Boulevard near Riverbottom in the Jurupa Valley has quickly grown to five to seven acres and that extinguishing agents are being deployed for at least eight hours Saturday . Firefighters from the cities of Riverside and Corona are helping fight the blaze.
Here is a graph showing the strongest gusts reported since midnight. The winner is Magic Mountain Truck Trail with a gust of 80 MPH.#SantaAnaWinds will increase slightly this morning before slowly decreasing this afternoon. #CAwx #lukewarm pic.twitter.com/dDthv5eEcr
— NWS Los Angeles (@NWSLosAngeles) November 19, 2022
Gusts were reported at 59 mph in Rancho Cucamonga and San Bernardino; Jurupa Valley at 57 mph; and Trabuco Canyon in Orange County at 55 mph.
Forecasters said mountainous areas will see winds of 25 to 40 mph, with gusts reaching 40 to 60 mph in some areas, along with localized gusts of up to 70 mph in windy peaks and ravines. The strongest winds are expected on Saturday morning and afternoon.
Wind gusts of up to 80 km/h were expected in the valley areas, with some localized gusts reaching 60 km/h in the foothills.
“Humidity will initially be above critical levels this evening at the start of stronger winds, but will fall in the range of 12 to 20 percent by early Saturday morning,” the NWS said on Friday.
A red flag warning, the highest level of alert, is issued when high winds and low humidity could result in an extreme fire hazard within 24 hours. A fire weather warning will be issued when such weather conditions are likely to exist for the next 12 to 72 hours.
The City News Service contributed to this report.
https://www.ocregister.com/2022/11/19/red-fire-warnings-in-effect-throughout-southern-california-firefighters-battle-jurupa-valley-blaze/ Red Flag Warnings Across Southern California; Firefighters battle fire in Jurupa Valley – Orange County Register