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Smoke Call Status:   Weekdays (M-F) @ 1300 hrs PST (except holidays)
Issued: 12:30 PM   Friday, December 20, 2024
Discussion - Saturday & Sunday
Unsettled weather pattern due to 2 Pacific frontal passages will occur during the weekend. Transport winds will be steady to strong and generally be S-SW with some westerly influence behind the frontal passages. Mixing heights should be unusually high during the afternoons and overnights. A clean-out period will result from the heightened ventilation rates. Widespread precipitation will also occur. 
Transport winds
Mixing Heights
(mph) (ft AGL)
Saturday Afternoon Saturday Afternoon
Saturday Night Saturday Night
Click on images to enlarge
Transport winds
Mixing Heights
Sunday Afternoon Sunday Afternoon
Extended Outlook:  Monday - Wednesday
The unsettled weather pattern will continue Mon & Tue with some brief stable Ridging likely on Wed. Mixing heights will remain unusually high for the time of year. Transport winds will be dominated by a W-SW-S flow Mon & Tue then become a bit more variable/lighter on Wed. An extension of the weekend clean-out period will occur early next week due to heightened ventilation rates. Ventilation rates should noticeably lower on Wed with a stronger nighttime inversion. Widespread precipitation will continue Mon & Tue. 
Helpful Resources:
Air Resources Board
San Joaquin Air Quality
AirNow Fire and Smoke Map
North Zone Predictive Services Weather Page
South Zone Predictive Services Weather Page
NWS California Fire Weather Page
NWS Spot Forecast Request
This Product was developed by the Predictive Services group, located at the North Zone Coordination Center in Redding, California