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Smoke Call Status:   Mon thru Fri excluding holidays
Issued: 12:30 PM   Wednesday, December 03, 2025
Discussion - Thursday & Friday
Ridge will remain the strongest pattern influencer during Thu and Fri although the Jet will sage a little further south over portions of the area on Fri. The transport wind flow will be variable with an initial northerly influence then transitioning towards a W-NW direction on Fri. Localized steadier winds Thu with a slight increase on Fri favoring the northern tier, especially the higher elevations. Mixing heights will also show some improvment between Thu and Fri. Ventilation as a whole will be in the poor to locally moderate range on Thu and Fri although some good ratings are likely across the northern tier on Fri with improvments. 
Transport winds
Mixing Heights
(mph) (ft AGL)
Thursday Afternoon Thursday Afternoon
Thursday Night Thursday Night
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Transport winds
Mixing Heights
Friday Afternoon Friday Afternoon
Extended Outlook:  Saturday - Monday
Ridging influences should remain Sat thru Mon with a more active portion of the Jet found further north over the Pac NW. With that being said, an edge of it will catch far N. CA and provide a smattering of light precipitation across the far northern tier during the weekend. Mixing will fluctuate with the best mixing found across the N & E and strong overnight inversions should remain. The highest mixing should occur Sat with much improved heights across the Modoc Plateau and along/E of the Crest. Transport winds should be W-SW across most of the area although expect some diurnal changes and the steadier speeds will remain across the N & E. This means ventilation rates will remain poor across broad portions of the area with some moderate values across the N & E. 
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