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Smoke Call Status:   M-F (except holidays) @ 1300 hrs PDT
Issued: 12:30 PM   Friday, July 18, 2025
Discussion - Saturday & Sunday
Warm & dry conditions will continue Sat supported by flat ridging with weak troughing to the north which will deepen over the Pacific NW on Sun and return temps to near seasonal averages. Locally breezy W-SW winds through Greater Bay Area coastal gaps & Delta and east of the Nrn Sierra Mtns, NW winds in the W & N and light S to SE flow up the Sac Vly will develop Sat afternoon & evening then strengthen Sun as the marine layer along the coast gradually deepens. While afternoon mixing heights will be good to excellent across the N & E and mainly good to locally moderate in central portions of the area with moderate to locally low mixing heights near the coastal marine layer, smoke will likely keep accumulating over portions of the area and especially in valleys near ongoing fires due to generally light overnight through morning winds and persistent overnight thermal belts.
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
Troughing will continue to deepen over NW portions of the area on Mon then cut off into a closed low off the North Ops coast Tue & Wed. Breezy onshore flow W-SW to NW winds become more enhanced on Mon with gusty SW winds strengthening from the Cascade/Sierra crest eastward. Increased and broader transport winds on Mon will improve smoke dispersion conditions during the afternoon & evening but smoke will continuing accumulating in valleys during the overnight through morning hours. Breezy though not as strong SW to NW winds will continue Tue & Wed with moderate to good across all but western portions of the area where the marine layer will continue to have a stabilizing effect.
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