South Willamette Valley Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Air Stagnation Advisory
Issued: 11:24 AM PST Dec. 13, 2017 – National Weather Service

... Air stagnation advisory remains in effect until 2 PM PST
Thursday...
... Freezing fog advisory is cancelled...

The National Weather Service in Portland has cancelled the
freezing fog advisory.

* Freezing fog advisory... fog is clearing and temperatures are
rising, so the freezing fog advisory has been cancelled.

* Air quality... air quality may deteriorate due to an extended
period of stagnant air conditions.

* Timing... through Thursday afternoon.

* Locations... the southern Willamette Valley.

* Impacts... limited ventilation may result in deteriorating air
quality continuing this week.

Precautionary/preparedness actions...

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






1124 am PST Wed Dec 13 2017

... Air stagnation advisory remains in effect until 2 PM PST
Thursday...
... Freezing fog advisory is cancelled...

The National Weather Service in Portland has cancelled the
freezing fog advisory.

* Freezing fog advisory... fog is clearing and temperatures are
rising, so the freezing fog advisory has been cancelled.

* Air quality... air quality may deteriorate due to an extended
period of stagnant air conditions.

* Timing... through Thursday afternoon.

* Locations... the southern Willamette Valley.

* Impacts... limited ventilation may result in deteriorating air
quality continuing this week.

Precautionary/preparedness actions...

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