Foothills of the Northern Blue Mountains of Oregon Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Dense Fog Advisory, Air Stagnation Advisory
Issued: 4:32 PM PST Nov. 20, 2018 – National Weather Service

... Dense fog advisory in effect until 1 PM PST Wednesday...
... Air stagnation advisory remains in effect until 1 PM PST

The National Weather Service in Pendleton has issued a dense fog
advisory... which is in effect until 1 PM PST Wednesday.

* Air quality... strong inversions with stagnant air conditions
near the surface continue to trap pollutants and moisture.

* Visibilities... one quarter of a mile or less at times.

* Timing... now until at least Wednesday mid day.

* Impacts... limited visibility and possible slick roadways due to
fog droplets freezing on surfaces. Poor air quality may cause
issues for people with respiratory problems.

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 unhealthy levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

State air quality agencies highly recommend 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. Check with
your local burn agency for any current restrictions in your area.

A dense fog advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving... slow down...
use your headlights... and leave plenty of distance ahead of you.

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