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Smoke Call Status: Daily @ 1300 hrs PDT
Issued: 12:30 PM   Thursday, September 23, 2021
Discussion:
Upper level ridging overhead on Fri will bring warm, dry and stable conditions with reduced mixing heights and fairly light transport winds. Diminished smoke dispersion conditions will continue through Sat morning then begin an increasing trend Sat afternoon as an upper level trough approaches the Pacific NW.  Increasing mixing heights Sat afternoon will favor northern and eastern areas with coastal gap and SW winds from the crest eastward becoming breezier.
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
Extended Outlook: Sunday - Tuesday
Smoke dispersion conditions will increase more significantly area wide Sun & Mon as upper level troughing deepens along the coast and remain very active Tue as the upper trough rotates inland. Onshore flow will deepen along the coast with SW winds increasing from the crest eastward Sun with the strongest winds expected Mon afternoon. Conditions will become more unstable through this time period as well.
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