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  Storm Center: Weather Alerts: Warnings


 
My Location: San Francisco, CA 
 
Current Time: 08:49:24 PM PDT

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Weather Alert
    Other Weather Alerts
Type Red Flag Warning

Red Flag Warning

Issued By NWS Oxnard (The Los Angeles Area)
Issuing Time Sun, 25 Oct 2020 15:39:00 PDT
Broadcast Time Sun, 25 Oct 2020 15:39:00 PDT
Valid Until Tue, 27 Oct 2020 18:00:00 PDT
Brief Description Red Flag Warning
Detailed Description RED FLAG WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY AFTERNOON FOR STRONG NORTHEAST WINDS AND VERY LOW RELATIVE HUMIDITY FOR ALL OF LOS ANGELES AND VENTURA COUNTIES EXCEPT FOR THE ANTELOPE VALLEY. .Moderate to strong Santa Ana winds are expected to develop across most of Los Angeles and Ventura Counties late tonight through Tuesday, likely the strongest Santa Ana event we have seen so far this season. The strongest winds are expected late tonight through Monday evening, when damaging gusts of 60 to 80 mph can be expected in the mountains, gusts of 50 to 60 mph in the wind prone valleys, and gusts of 35 to 50 mph from the Ventura coast to Malibu and the Hollywood Hills. The downslope winds will bring rapid drying, with widespread single digit humidities by late Monday morning, and continuing through Tuesday. In general, the offshore winds are expected to diminish slightly later Monday night and Tuesday, but there is some uncertainty in how much the winds will decrease during this time period. The moderate to strong Santa Ana winds coupled with very low humidities and very dry fuels will likely bring the most dangerous fire weather conditions we have seen since October 2019 to Los Angeles and Ventura counties. A particularly dangerous situation is expected for the Los Angeles County mountains Monday afternoon and evening due to the unusual combination of damaging wind gusts of 60 to 75 mph, single digit humidities, and extremely dry vegetation. New fire ignitions will have the potential for very rapid fire growth, extreme fire behavior, and long range spotting, resulting in a significant threat to life and property. . RED FLAG WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM PDT TUESDAY FOR STRONG NORTH TO NORTHEAST WINDS AND VERY LOW RELATIVE HUMIDITY FOR THE VALLEYS OF LOS ANGELES AND VENTURA COUNTIES. * Winds. North to northeast 20 to 40 mph with damaging wind gusts of 50 to 60 mph late tonight through Monday evening. Strongest winds across the eastern Ventura valleys, Santa Clarita Valley, northern/western portion of the San Fernando Valley, and the foothills of the San Gabriel Valley. Winds likely to diminish some Monday night into Tuesday morning, with gusts generally 30 to 45 mph, except local gusts to 50 mph in the foothills. * Relative Humidity. Lowering rapidly to 15 to 25 percent late tonight into early Monday morning, then widespread single digit humidities by late Monday Morning through Tuesday. Humidities potentially falling as low as 3 to 5 percent, driest over Los Angeles county. * Impacts. Due to the damaging wind gusts expected with this event, there will be an increased risk of fire ignitions due to downed trees and powerlines. If fire ignition occurs, conditions will be favorable for very rapid fire spread, long range spotting, and extreme fire behavior which would threaten life and property.
       
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