Southwest Interior Severe Watches & Warnings NOAA Weather Radio

Air Stagnation Advisory
Statement as of 2:00 PM PST on November 25, 2015

... Air stagnation advisory in effect from 9 PM Thursday to noon
PST Monday...

The National Weather Service in Seattle has issued an air
stagnation advisory for the interior lowlands of western
Washington from Lewis County northward... which is in effect from
9 PM Thursday to noon PST Monday.

A strong ridge of high pressure will build over the Pacific
northwest Thursday night through at least Monday of next week.
This pattern will trap cold air near the surface... resulting in
temperature inversions along with light winds. This combination
will allow pollutants like wood smoke and vehicle or Industrial
emissions to degrade air quality through this Holiday weekend and
into early next week.

Conditions will be evaluated daily. It is possible the period of
air stagnation will extend beyond noon Monday. Check with your
local air quality agency for possible restrictions in your area.

Precautionary/preparedness actions...

An air stagnation advisory indicates that due to limited movement
of an air mass across the advisory area... pollution could increase
to unhealthy levels. Persons with respiratory illness should
follow their physicians advice for dealing with high levels of air


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