Smoke Call Status:

Weekdays (M-F) @ 1300 hrs PST (except holidays)

Issued:

12:30 PM   Friday, December 20, 2024

Discussion - Saturday & Sunday

Unsettled weather pattern due to 2 Pacific frontal passages will occur during the weekend. Transport winds will be steady to strong and generally be S-SW with some westerly influence behind the frontal passages. Mixing heights should be unusually high during the afternoons and overnights. A clean-out period will result from the heightened ventilation rates. Widespread precipitation will also occur.

(mph)

(ft AGL)

Saturday Afternoon

Saturday Afternoon

Saturday Night

Saturday Night

Click on images to enlarge

Sunday Afternoon

Sunday Afternoon

Extended Outlook:

Monday - Wednesday

The unsettled weather pattern will continue Mon & Tue with some brief stable Ridging likely on Wed. Mixing heights will remain unusually high for the time of year. Transport winds will be dominated by a W-SW-S flow Mon & Tue then become a bit more variable/lighter on Wed. An extension of the weekend clean-out period will occur early next week due to heightened ventilation rates. Ventilation rates should noticeably lower on Wed with a stronger nighttime inversion. Widespread precipitation will continue Mon & Tue.

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