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Smoke Call Status: Daily @ 1300 hrs. PST except weekends and holidays
Issued: 12:30 PM   Friday, May 24, 2019
Two low pressure systems will affect the area this weekend. This means unusually high mixing heights, most areas, and variable transport winds due to the low pressure movement. Ventilation will be the highest on Saturday as indicated by the forecast graphics. Widespread precipitation is expected Saturday night into Sunday which will provide some clean out conditions. 
Transport winds
Mixing Heights
(mph) (ft AGL)
Saturday Afternoon Saturday Afternoon
Saturday Night Saturday Night
Click on images to enlarge
Transport winds
Mixing Heights
Sunday Afternoon Sunday Afternoon
Extended Outlook: Monday - Wednesday
Low pressure Monday will likely give way to high pressure Monday night into Tuesday before another possible break down in the high pressure ridge. This means quite a bit of variablity, especially for mixing heights with deeper inversions. Ventilation overall should be the lowest on Tuesday. 
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