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Smoke Call Status:   Mon thru Fri excluding holidays
Issued: 12:30 PM   Friday, December 12, 2025
Discussion - Saturday & Sunday
Strong inversion pattern will continue during the weekend although some slight improvements will occur on Sun due to a weak disturbance passage. Look for lower mixing Sat, before improving slightly on Sun. Similar for transport winds with a more noticeable increase in steadier speeds across the northern tier on Sun, albeit localized. Ventilation as a whole will remain in the poor to very poor category with some isolated moderates across the north on Sat and north and east on Sun. 
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
A pattern change is expected during this period with slightly increasing mixing and transport winds (W-SW-S) on Mon but more so Tue and Wed. A significant clean-out event is likely Tue and Wed due to a strong and active Jet. Precipitation will begin to increase by Mon night but more so Tue into Wed. 
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