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Smoke Call Status: Everyday Mon-Fri @ 1300 hrs. (except holidays)
Issued: 12:30 PM   Wednesday, September 20, 2023
Low pressure will affect the region Thu and then give way to Ridging on Fri. The strongest transport winds and mixing will occur Thu where conversely, both readings will noticeably decrease, especially the transport wind flow. This means ventilation will lower noticeably Fri compared to Thu. Also note the different directions forecasted for Thu. A northerly wind flow is projected for a good portion of the area while westerly winds show up across the Bay Area. This means the diferent wind patterns converge along a line creating a trapping particulate scenario somewhere between the Sac Vly and Bay Area on Thu. 
Transport winds
Mixing Heights
(mph) (ft AGL)
Thursday Afternoon Thursday Afternoon
Thursday Night Thursday Night
Click on images to enlarge
Transport winds
Mixing Heights
Friday Afternoon Friday Afternoon
Extended Outlook: Saturday - Monday
Initial Ridging will give way to Pacific Troughing during this period thus leading to increasing westerly and southerly transport winds. Stronger horizontal transport is expected Sun into Mon and should create a partial to full clean-out event. Some rainfall should enter into the picture sometime late weekend into early next week, especially favoring NW areas. 
Helpful Resources On-Line:
Air Resources Board
San Joaquin Air Quality
North Zone Predictive Services
South Zone Predictive Services
SPOT Forecast Request North
SPOT Forecast Request South
This Product was developed by the Predictive Services group, located at the North Zone Coordination Center in Redding, California