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Smoke Call Status: Daily @ 1300 hrs PDT
Issued: 12:30 PM   Tuesday, August 22, 2017
An upper level trough will begin to approach the OR Coast on Wednesday and will drag a cold front east along the OR/CA state line Thursday. The approach and passage of the front will enhance the mixing conditions across Northern California during this period leading to favorable smoke dispersion. Transport wind flow will be from the WNW and breezy along the higher ridges and also in the larger, more exposed valley locations. Convective activited will be limited to Wednesday and will be focused to the northeastern corner of the state.
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 Monday: A very weak disturbance will move NE across Northern California ahead of a developing ridge of high pressure on Friday. This should allow for one last day of somewhat favorable dispersion conditions under a weaker SW flow. Smoke dispersion concerns will reemerge Saturday-Monday as high pressure builds over the region and stabilizes the atmosphere. This should led to unfavorable smoke dispersion conditions.
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