Smoke Call Status:

Mon thru Fri excluding Holidays

Issued:

12:30 PM   Thursday, September 17, 2026

Discussion - Friday & Saturday

Low-Pressure system will give way to weak Ridging on Fri-Sat. This means strengthening overnight inversions although afternoon mixing appears to be near season. Transport winds will lower especially on Sat. N-NW-W transport winds are likely during the afternoons. Ventilation as a whole will lower with moderate to good ratings likely Fri trending towards poor to moderate on Sat.

(mph)

(ft AGL)

Friday Afternoon

Friday Afternoon

Friday Night

Friday Night

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Saturday Afternoon

Saturday Afternoon

Sunday - Tuesday

A weaker low-pressure system will skirt over the area Sun into Mon before some weaker Ridging on Tue. The fluctuations in the weather patterns will lead to fluctuating mixing height and transport winds. Mixing height values west of the Cascade-Sierra Crest look to be near or perhaps a little below normal while the higher values should be found east of the Crest. Transport winds look to be on the lighter side with variable directions. Ventilation should continue to lower during this period with lots of poor and moderate ratings although some locally good across the far east.

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