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Smoke Call Status:   Every day due to ARA deployment
Issued: 12:30 PM   Friday, August 08, 2025
Discussion - Saturday & Sunday
Ridging will be the main weather pattern during the weekend. A split flow wind flow will be found within that weather pattern with E-NE-N wind directions favoring northern areas and NW-W across most of the Coastal Range and especially favoring the Bay Area. Lesser horizontal air motion will be found broadly within the Sac Vly and portions of Trinity and the Far East during this period thus making for lesser ventilation rates during the afternoon. Mixing however should be abundant enough across those areas, at least initially to keep stagnation more muted. Overnight inversions will strengthen however. In general, look for mixed ventilation with conditions ranging from poor to good. 
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
Ridge pattern is expected to break-down during the earlier half of next week, especially Tue into Wed. This should lead to an increase in onshore winds and therefore areawide improvements in ventilation. Mixing heights will remain pretty good across the interior with lessening impacts from overnight inversions although they will still be present, especially early in the forecast period.  
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