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Smoke Call Status: The next 1300 smoke call is 2/25 (new Passcode: 8834081) 
Issued: 12:30 PM   Thursday, February 21, 2019
Discussion:
Ventilation will lower both Friday and Saturday. Pockets of higher ventilation will be observed within the Sacramento Valley and along the west slopes of the Cascade-Sierra Ranges due to stronger transport winds, but overalll ventilation will be on the poorish side.  
Transport winds
Mixing Heights
(mph) (ft AGL)
Friday Afternoon Friday Afternoon
Friday Night Friday Night
Click on images to enlarge
Transport winds
Mixing Heights
Saturday Afternoon Saturday Afternoon
No Graphic Available No Graphic Available
Extended Outlook: Sunday - Tuesday
Ventilation will increase Sunday through early next week due to an incoming trough. The initial increase will occur across the north in terms of rising mixing heights and transport winds but eventually spread southward. 
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