724
WWUS76 KPDT 292003
NPWPDT

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
1203 PM PST Mon Dec 29 2025

ORZ044-507-508-510-511-WAZ026>029-301700-
/O.NEW.KPDT.AS.Y.0002.251229T2003Z-260101T2000Z/
Lower Columbia Basin of Oregon-Foothills of the Northern Blue
Mountains of Oregon-Foothills of the Southern Blue Mountains of
Oregon-North Central Oregon-Central Oregon-Kittitas Valley-Yakima
Valley-Lower Columbia Basin of Washington-Foothills of the Blue
Mountains of Washington-
Including the cities of Madras, Naches, Ellensburg, Condon,
Pendleton, Boardman, Dufur, Heppner, Redmond, Sunnyside, Fossil,
Prosser, Dayton, Hermiston, Yakima, Waitsburg, Walla Walla,
Maupin, Moro, Athena, Ione, Prineville, Tri-Cities, Connell,
Toppenish, Pilot Rock, Thorp, and Bend
1203 PM PST Mon Dec 29 2025

...AIR STAGNATION ADVISORY IN EFFECT UNTIL NOON PST THURSDAY...

* WHAT...Stagnant conditions will have the potential to trap
  pollutants near the ground and deteriorate air quality.

* WHERE...Foothills of the Blue Mountains of Oregon and Washington,
  Lower Columbia Basin of Oregon and Washington, North Central
  Oregon, Central Oregon, Kittitas Valley, and Yakima Valley.

* WHEN...Until noon PST Thursday.

* IMPACTS...Periods of air stagnation can lead to the buildup of
  pollutants near the surface, potentially leading to poor 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 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.

&&

$$

MC