North Central Oregon Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Freezing Fog Advisory, Air Stagnation Advisory
Issued: 11:58 AM PST Dec. 11, 2017 – National Weather Service

... Freezing fog advisory now in effect until noon PST Tuesday...
... Air stagnation advisory remains in effect until 10 am PST

* air quality... moderate to unhealthy.

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

* Timing... areas of freezing fog through Tuesday morning.
Stagnant air to persist for several more days.

* Impacts... persons with respiratory issues should follow the
advice of their physician on how to deal with poor air
quality. Also outdoor burning may be limited, so please
consult with your local burn agencies. Motorists should be
prepared for sudden changes in visibility. Also roadways and
sidewalks may become slippery due to fog freezing on surfaces.

Precautionary/preparedness actions...

A freezing 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.
Also... be alert for frost on bridge decks causing slippery roads.

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 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.