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Smoke Call Status: Daily @ 1300 hrs. PDT
Issued: 12:30 PM   Friday, August 23, 2019
Discussion:
Ventilation will be trending lower through Tuesday due to the stabilizing effects of a high pressure ridge that will be overhead. Some gustier winds will be found along the Cascade-Sierra eastward on Sat/Sun afternoons, but widespread-organized higher transport winds are not likely with this pattern. Thus, the lower ventilation. 
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
The stable high pressure ridge will remain overhead through Tuesday, so day-to-day changes in smoke dispersion conditions will be small. On Wednesday the high pressure ridge will begin to break down, allowing conditions to improve due to increasing S-SW flow and deeper vertical mixing.
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