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Smoke Call Status: Daily @ 1300 hrs. PST, except weekends and holidays
Issued: 12:30 PM   Friday, April 20, 2018
Discussion:
Smoke dispersion conditions will diminish a bit today and Saturday as high pressure moves overhead, leading to more stable conditions with light afternoon winds. Northerly surface winds will provide some transport to the west of the Sierra-Cascade crest during nights and mornings, however. A slight improvement is expected Sunday as a weak disturbance passes to our north, but stable conditions with light winds will return Monday.
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
High pressure will return Monday and produce lower mixing heights and lighter winds. On Tuesday mixing heights and SE-SW winds will begin to increase as a Pacific low pressure area approaches. This low will likely provide active smoke dispersion conditions through the end of next week.
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