Lewis and Southern Nez Perce Counties

 Air Stagnation Advisory  Statement as of 11:53 am PST on November 27, 2015

... Air stagnation advisory remains in effect until noon PST

* air quality... poor ventilation will result in a build up of
pollutants near the surface. Mountain valleys will be
especially susceptible to stagnant air and pollution build up.
Light northeasterly winds across the Columbia Basin will also
tend to push pollutants up against the east slopes of the
northern Cascades between Thursday and Saturday. These winds
will become calm by Sunday with a greater risk of pollutant
build up over much of the region by this time.

* Timing... through Monday morning.

* Impacts... prolonged periods of stagnant air can hold fine
particulates close to the ground and degrade air quality.

Precautionary/preparedness actions...

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

During periods of stagnant air... state air quality agencies
highly recommended that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies... prolonged periods of
stagnant air can hold pollutants close to the ground... where
people live and breathe.

 Record Report  Statement as of 9:25 am PST on November 27, 2015

The high temperature at holden_village in the past 24 hours ending at 800 am
was 17 degrees. This sets the record for the coldest high temperature
for this period. The previous record of 20 degrees was set in 1993.
Records have been kept at this site since 1930.

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