Air Stagnation Advisory
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
414 PM MST Sun Jan 18 2026
IDZ011>014-028-033-ORZ061>064-191800-
/O.CON.KBOI.AS.Y.0001.000000T0000Z-260122T1800Z/
West Central Mountains-Lower Treasure Valley-Boise Mountains-
Upper Treasure Valley-Camas Prairie-Upper Weiser River-Harney
County-Baker County-Malheur County-Oregon Lower Treasure Valley-
Including the cities of Cascade, Fairfield, New Princeton, Selby,
Mesa, Ontario, Warm Lake, Dunnean, Burns, Prairie, Venator,
McCall, Blaine, Hill City, Diamond, Ola, Big Creek, Malheur City,
Glendale, Bear, Council, Goodrich, Buchanan, Pine, Caldwell,
Boise, Corral, Crane, Cuprum, Indian Valley, Soldier, Anderson
Dam, Baker, Fruitvale, Cambridge, Nampa, and Nyssa
414 PM MST Sun Jan 18 2026 /314 PM PST Sun Jan 18 2026/
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST /10 AM
PST/ THURSDAY...
* WHAT...An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that will continue to trap pollutants.
* WHERE...Portions of southwest Idaho and northeast and southeast
Oregon.
* WHEN...Until 11 AM MST /10 AM PST/ Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
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.
&&
$$
SH
URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
1048 AM PST Sun Jan 18 2026
IDZ001-004-026-027-202000-
/O.CON.KOTX.AS.Y.0001.000000T0000Z-260121T0000Z/
Northern Panhandle-Central Panhandle Mountains-Lewiston Area-
Lewis and Southern Nez Perce Counties-
Including the cities of Peck, Lewiston Grade, Schweitzer Mountain
Road, Clark Fork, Kellogg, Winchester, Sandpoint, Wallace,
Eastport, Craigmont, Soldiers Meadow Road, Bonners Ferry, Lookout
Pass, Athol, Dobson Pass, Kamiah, Culdesac, Nezperce, Fourth Of
July Pass, Priest River, Mullan, Lewiston, Pinehurst, Lapwai,
Gifford, Osburn, St. Maries, and Fernwood
1048 AM PST Sun Jan 18 2026
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
TUESDAY...
* WHAT...For the Air Stagnation Advisory, stagnant conditions will
have potential to trap pollutants near the ground with
deteriorated air quality. For the Dense Fog Advisory, visibility
down to a half mile in fog.
* WHERE...Peck, Lewiston Grade, Schweitzer Mountain Road, Clark
Fork, Kellogg, Winchester, Sandpoint, Wallace, Eastport,
Craigmont, Soldiers Meadow Road, Bonners Ferry, Lookout Pass,
Athol, Dobson Pass, Kamiah, Culdesac, Nezperce, Fourth Of July
Pass, Priest River, Mullan, Lewiston, Pinehurst, Lapwai, Gifford,
Osburn, St. Maries, and Fernwood.
* WHEN...Until 4 PM PST Tuesday.
* IMPACTS...Periods of air stagnation can lead to the buildup of
pollutants near the surface.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Buildup of fine pollution particles can be harmful to those
sensitive to air pollution including people with lung and heart
problems, people with diabetes, children and the elderly.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
1048 AM PST Sun Jan 18 2026
IDZ002-WAZ034>036-044-202000-
/O.CON.KOTX.AS.Y.0002.000000T0000Z-260121T0000Z/
Coeur d`Alene Area-Moses Lake Area-Upper Columbia Basin-Spokane
Area-Waterville Plateau-
Including the cities of Coeur d`Alene, Wilbur, Coulee City,
Davenport, Odessa, Spokane Valley, Post Falls, Worley, Othello,
Ritzville, Mansfield, Rockford, Hayden, Harrington, Grand Coulee,
Downtown Spokane, Fairfield, Ephrata, Quincy, Cheney, Badger
Mountain Road, Creston, Waterville, Airway Heights, and Moses
Lake
1048 AM PST Sun Jan 18 2026
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
TUESDAY...
* WHAT...Stagnant conditions will have potential to trap pollutants
near the ground with deteriorated air quality.
* WHERE...Coeur d`Alene, Wilbur, Coulee City, Davenport, Odessa,
Spokane Valley, Post Falls, Worley, Othello, Ritzville, Mansfield,
Rockford, Hayden, Harrington, Grand Coulee, Downtown Spokane,
Fairfield, Ephrata, Quincy, Cheney, Badger Mountain Road, Creston,
Waterville, Airway Heights, and Moses Lake.
* WHEN...Until 4 PM PST Tuesday.
* 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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
1048 AM PST Sun Jan 18 2026
WAZ037-038-041-043-047>049-202000-
/O.CON.KOTX.AS.Y.0001.000000T0000Z-260121T0000Z/
Northeast Mountains-Okanogan Highlands-Wenatchee Area-Okanogan
Valley-Central Chelan County-Western Chelan County-Western
Okanogan County-
Including the cities of Number 1 Canyon, Colville, Ione, Pangborn
Airport, Springdale-Hunters Road, Cashmere, Disautel Pass,
Highway 20 Wauconda Summit, Conconully, Twisp, Entiat, Okanogan,
Boulder Creek Road, Number 2 Canyon, Leavenworth, Chelan, Deer
Park, Metaline, Wenatchee, Brewster, Chewelah, Omak, Oroville,
Methow, Winthrop, Wauconda, Newport, Kettle Falls, Loup Loup
Pass, Plain, Stehekin, Northport, Stevens Pass, Nespelem, Holden
Village, Fruitland, Mazama, Sherman Pass, Metaline Falls,
Bridgeport, Flowery Trail Road, Tiger, Republic, Chesaw Road,
Orin-Rice Road, Inchelium, and Tonasket
1048 AM PST Sun Jan 18 2026
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
TUESDAY...
* WHAT...Stagnant conditions will have potential to trap pollutants
near the ground with deteriorated air quality.
* WHERE...Number 1 Canyon, Colville, Ione, Pangborn Airport,
Springdale-Hunters Road, Cashmere, Disautel Pass, Highway 20
Wauconda Summit, Conconully, Twisp, Entiat, Okanogan, Boulder
Creek Road, Number 2 Canyon, Leavenworth, Chelan, Deer Park,
Metaline, Wenatchee, Brewster, Chewelah, Omak, Oroville, Methow,
Winthrop, Wauconda, Newport, Kettle Falls, Loup Loup Pass, Plain,
Stehekin, Northport, Stevens Pass, Nespelem, Holden Village,
Fruitland, Mazama, Sherman Pass, Metaline Falls, Bridgeport,
Flowery Trail Road, Tiger, Republic, Chesaw Road, Orin-Rice Road,
Inchelium, and Tonasket.
* WHEN...Until 4 PM PST Tuesday.
* 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.
&&
$$
OTX
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1057 AM PST Thu Jan 15 2026
IDZ005>007-210000-
/O.EXT.KMSO.AS.Y.0001.000000T0000Z-260121T0000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
Orofino/Grangeville Region-
1057 AM PST Thu Jan 15 2026
...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL 4 PM PST TUESDAY...
* WHAT...Stagnation conditions will trap pollutants, leading to
deteriorating air quality, particularly in lower elevations and
valleys.
* WHERE...Orofino/Grangeville Region, Southern Clearwater Mountains,
and Northern Clearwater Mountains.
* WHEN...Until 4 PM PST Tuesday.
* 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.
&&
$$
