Smoke Call Status:

Everyday Mon-Fri @ 1300 hrs. (except holidays)

Issued:

12:30 PM Wednesday, September 20, 2023

Discussion:

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.

(mph)

(ft AGL)

Thursday Afternoon

Thursday Night

Click on images to enlarge

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