Smoke Call Status:

Mon thru Fri excluding Holidays

Issued:

12:30 PM   Friday, April 17, 2026

Discussion - Saturday & Sunday

Ridging will occur on Sat then begin to break-down on Sun. The break-down phase will lead to higher mixing, both day and night as overnight inversions will weaken. Transport wind flow will switch back to more of an onshore influence (W-SW-S) during the weekend with strengthening speeds on Sun. Ventilation as a whole will generally be at moderate levels on Sat despite lesser transport winds then noticeably increase on Sun with clean-out characteristics.

(mph)

(ft AGL)

Saturday Afternoon

Saturday Afternoon

Saturday Night

Saturday Night

Click on images to enlarge

Sunday Afternoon

Sunday Afternoon

Monday - Wednesday

Pacific Low influences likely during the earlier half of next week. Mixing heights will be more than adequate outside of the precipitation shafts while transport winds are likely to be steady to stronger (SW-S) at least during Mon-Tue. Less confidence on the transport winds for Wed as it depends on the path/timing of the Low but current indications suggest steady to strong W-SW winds. Widespread precipitation also expected. Continued clean-out properties likely earlier half of next week.

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