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Smoke Call Status: held weekdays at 1300 PDT
Issued: 12:30 PM   Tuesday, May 23, 2017
The high pressure that has prevailed throughout Northern CA will weaken a bit tonight as low pressure moves through the Pacific NW and into the Great Basin. A trough will gradually deepen over Northern CA through Friday. Mixing heights will only rise a small amount from the western Cascade-Sierra slopes to the coast, but SW-NW transport winds there will increase. From the high country of the Cascade-Sierra ranges to the east mixing heights will be fairly high with moderate and sometimes stronger SW-NW mixing heights. In general, smoke dispersion conditions will only good in eastern areas and fair elsewhere.
Transport winds
Mixing Heights
(mph) (ft AGL)
Wednesday Afternoon Wednesday Afternoon
Wednesday Night Wednesday Night
Click on images to enlarge
Transport winds
Mixing Heights
Thursday Afternoon Thursday Afternoon
Extended Outlook:
Friday through Sunday: Dispersion conditions will be about the same on Friday as Thursday, but diminish over the weekend as high pressure returns.
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