Air Stagnation Advisory
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
URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
1145 AM PST Mon Dec 29 2025
IDZ004-026-027-WAZ032-036>038-041-043-047>049-012000-
/O.NEW.KOTX.AS.Y.0002.251229T1945Z-260101T2000Z/
Central Panhandle Mountains-Lewiston Area-Lewis and Southern Nez
Perce Counties-Lower Garfield and Asotin Counties-Spokane Area-
Northeast Mountains-Okanogan Highlands-Wenatchee Area-Okanogan
Valley-Central Chelan County-Western Chelan County-Western
Okanogan County-
Including the cities of Spokane Valley, Winthrop, Pinehurst,
Wauconda, Oroville, Clarkston, Brewster, Tiger, Boulder Creek
Road, Gifford, Kamiah, Disautel Pass, Okanogan, Deer Park,
Highway 20 Wauconda Summit, St. Maries, Soldiers Meadow Road,
Chelan, Loup Loup Pass, Culdesac, Tonasket, Sherman Pass,
Conconully, Fernwood, Chewelah, Holden Village, Kellogg, Chesaw
Road, Methow, Mazama, Dobson Pass, Fourth Of July Pass, Kettle
Falls, Nespelem, Twisp, Inchelium, Newport, Omak, Lookout Pass,
Pangborn Airport, Metaline, Wallace, Davenport, Metaline Falls,
Cashmere, Peck, Stevens Pass, Springdale-Hunters Road, Pomeroy,
Winchester, Colville, Number 2 Canyon, Lewiston, Cheney, Plain,
Airway Heights, Northport, Fairfield, Downtown Spokane, Stehekin,
Bridgeport, Mullan, Flowery Trail Road, Craigmont, Entiat,
Lewiston Grade, Rockford, Fruitland, Wenatchee, Leavenworth,
Alpowa Summit, Republic, Number 1 Canyon, Nezperce, Osburn,
Lapwai, Ione, and Orin-Rice Road
1145 AM PST Mon Dec 29 2025
...AIR STAGNATION ADVISORY IN EFFECT UNTIL NOON PST THURSDAY...
* WHAT...Stagnant conditions will have potential to trap pollutants
near the ground with deteriorated air quality.
* WHERE...Portions of North and North Central Idaho and North
Central, Northeast, and Southeast Washington.
* WHEN...Until noon PST Thursday.
* IMPACTS...Periods of air stagnation can lead to the buildup of
pollutants near the surface.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Buildup of fine pollution particles can be harmful to those
sensitive to air pollution including people with lung and heart
problems, people with diabetes, children and the elderly.
&&
$$
JW
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1123 AM PST Mon Dec 29 2025
IDZ005>008-012000-
/O.NEW.KMSO.AS.Y.0002.251229T2000Z-260101T2000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
Orofino/Grangeville Region-Lower Hells Canyon/Salmon River Region-
1123 AM PST Mon Dec 29 2025
...AIR STAGNATION ADVISORY IN EFFECT UNTIL NOON PST THURSDAY...
* WHAT...Stagnation conditions will trap pollutants, leading to
deteriorating air quality.
* WHERE...Lower Hells Canyon/Salmon River Region,
Orofino/Grangeville Region, Southern Clearwater Mountains, and
Northern Clearwater Mountains.
* WHEN...Until noon PST Thursday.
* IMPACTS...Periods of air stagnation can lead to the build up of
pollutants near the surface.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.
According to state air quality agencies, prolonged period 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.
&&
$$
