Smoke Call Status:

Mon thru Fri excluding holidays

Issued:

12:30 PM   Wednesday, December 10, 2025

Discussion - Thursday & Friday

Ridging will remain the main pattern influencer Thu and Fri. This means strong overnight inversions and a fairly stable airmass during the afternoons. Therefore, mixing heights will be below normal and generally in the well below normal category. Transport winds will also be on the lighter side with just some localized steadier winds with multiple directions. Ventilation as a whole will be poor to very poor most locations.

(mph)

(ft AGL)

Thursday Afternoon

Thursday Afternoon

Thursday Night

Thursday Night

Click on images to enlarge

Friday Afternoon

Friday Afternoon

Extended Outlook:

Saturday - Monday

Weak disturbances will translate around the Ridge during this period but likely only provide subtle changes to the variables. Mixing heights look to be low on Sat but could improve a little bit Sun-Mon favoring the north and east. Stronger inversions will remain during the overnights. The transport wind flow should also gradually increase from W-SW Sun-Mon across the N & E otherwise a rather light wind flow overall. Bottomline, ventilation will improve, especially Sun-Mon but only incrementally and favoring the N & E. Ventilation will generally be in the poor to very poor category with some moderates across the northern and eastern tier.

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