Winter Weather Advisory
URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
303 PM PST Wed Dec 31 2025
WAZ303-010715-
/O.NEW.KSEW.WW.Y.0028.260101T2100Z-260102T1500Z/
Cascades of Southern King County-
Including Snoqualmie Pass, Greenwater, and SR18 at Tiger Mountain
Summit
303 PM PST Wed Dec 31 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM THURSDAY TO 7 AM PST
FRIDAY...
* WHAT...Mixed precipitation expected at Snoqualmie Pass. Ice
accumulations around one tenth of an inch.
* WHERE...Cascades of Southern King County.
* WHEN...From 1 PM Thursday to 7 AM PST Friday.
* IMPACTS...Plan on slippery road conditions.
* ADDITIONAL DETAILS...A mix of freezing rain and light snow is
expected Thursday evening into Friday morning for Snoqualmie Pass.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. Prepare for possible
power outages.
&&
$$
JD
URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
300 PM PST Wed Dec 31 2025
ORZ041-044-507-508-510-511-WAZ024-521-010700-
/O.EXT.KPDT.WW.Y.0031.260101T1200Z-260102T0900Z/
Eastern Columbia River Gorge of Oregon-Lower Columbia Basin of
Oregon-Foothills of the Northern Blue Mountains of Oregon-
Foothills of the Southern Blue Mountains of Oregon-North Central
Oregon-Central Oregon-Eastern Columbia River Gorge of Washington-
Simcoe Highlands-
Including the cities of Fossil, Prineville, Pendleton, White
Salmon, Condon, Ione, Madras, Bickleton, Dufur, Goldendale, Bend,
Redmond, Hermiston, Moro, Boardman, Pilot Rock, Heppner, Maupin,
Athena, The Dalles, and Arlington
300 PM PST Wed Dec 31 2025
...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 4 AM THURSDAY TO 1 AM
PST FRIDAY...
* WHAT...Freezing rain expected. Total ice accumulations of around
one tenth of an inch.
* WHERE...Portions of central, north central, and northeast Oregon
and central Washington.
* WHEN...From 4 AM Thursday to 1 AM PST Friday.
* IMPACTS...Difficult travel conditions are possible. The hazardous
conditions could impact the Thursday morning and evening commutes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. Prepare for possible
power outages. In Oregon, the latest road conditions can be obtained
by visiting tripcheck.com online, or by calling 5 1 1. In
Washington, the latest road conditions can be obtained by visiting
the website wsdot.wa.gov/travel.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
300 PM PST Wed Dec 31 2025
WAZ026>029-522-523-010700-
/O.CON.KPDT.WW.Y.0031.260101T1200Z-260102T1300Z/
Kittitas Valley-Yakima Valley-Lower Columbia Basin of Washington-
Foothills of the Blue Mountains of Washington-Upper Slopes of the
Eastern Washington Cascades Crest-Lower Slopes of the Eastern
Washington Cascades Crest-
Including the cities of Ellensburg, Naches, Toppenish, Cliffdell,
Appleton, Yakima, Prosser, Waitsburg, Walla Walla, Roslyn, Thorp,
Dayton, Sunnyside, Cle Elum, Tri-Cities, Connell, and Easton
300 PM PST Wed Dec 31 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 4 AM THURSDAY TO 5
AM PST FRIDAY...
* WHAT...Mixed precipitation expected. Ice accumulations around one
tenth of an inch.
* WHERE...Portions of central, south central, and southeast
Washington.
* WHEN...From 4 AM Thursday to 5 AM PST Friday.
* IMPACTS...Plan on slippery road conditions. The hazardous
conditions could impact the Thursday morning and evening commutes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions can be obtained by visiting the website
wsdot.wa.gov/travel.
&&
$$
MC
URGENT - WINTER WEATHER MESSAGE
National Weather Service Spokane WA
253 PM PST Wed Dec 31 2025
WAZ034-035-011500-
/O.NEW.KOTX.WW.Y.0038.260101T2200Z-260102T1200Z/
Moses Lake Area-Upper Columbia Basin-
Including the cities of Harrington, Odessa, Creston, Grand
Coulee, Coulee City, Ephrata, Ritzville, Wilbur, Moses Lake,
Othello, and Quincy
253 PM PST Wed Dec 31 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 2 PM THURSDAY TO 4 AM PST
FRIDAY...
* WHAT...Mixed precipitation of freezing rain, rain, and snow
expected. Total snow accumulations up to one half inch and ice
accumulations around one tenth of an inch.
* WHERE...Harrington, Odessa, Creston, Grand Coulee, Coulee City,
Ephrata, Ritzville, Wilbur, Moses Lake, Othello, and Quincy.
* WHEN...From 2 PM Thursday to 4 AM PST Friday.
* IMPACTS...Plan on slippery road conditions. Freezing rain may lead
to very slick conditions on untreated roads and surfaces.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. For the latest travel
information in Washington, go to https://wsdot.wa.gov/travel
&&
$$
JW
URGENT - WINTER WEATHER MESSAGE
National Weather Service Portland OR
1240 PM PST Wed Dec 31 2025
ORZ121-011400-
/O.NEW.KPQR.WW.Y.0026.260101T1800Z-260102T1800Z/
Upper Hood River Valley-
Including the cities of Odell and Parkdale
1240 PM PST Wed Dec 31 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 10 AM THURSDAY TO 10 AM
PST FRIDAY...
* WHAT...Freezing rain expected. Total ice accumulations between one
tenth to a quarter of an inch. Locally higher accumulations up to
three tenths of an inch possible.
* WHERE...Upper Hood River Valley.
* WHEN...From 10 AM Thursday to 10 AM PST Friday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.
Be prepared for slippery roads. Slow down and use caution while
driving. If you are going outside, watch your first few steps taken
on stairs, sidewalks, and driveways. These surfaces could be icy and
slippery, increasing your risk of a fall and injury.
Have a winter emergency driving kit readily available. Common items
to include: flashlight, batteries, blankets, a shovel, water,
non-perishable food items, tire chains, etc.
Be aware that walking surfaces may be slick. Walk with extra care.
For the latest road conditions and chain restrictions in Oregon,
call 5 1 1, or visit: www.tripcheck.com.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Portland OR
1240 PM PST Wed Dec 31 2025
ORZ122-WAZ210-011400-
/O.NEW.KPQR.WW.Y.0026.260101T1800Z-260102T1800Z/
Central Columbia River Gorge I-84 Corridor-Central Columbia River
Gorge SR 14 Corridor-
Including the cities of Underwood, Carson, Hood River, and Wyeth
1240 PM PST Wed Dec 31 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 10 AM THURSDAY TO 10 AM
PST FRIDAY...
* WHAT...Freezing rain expected. Total ice accumulations up to
around one tenth of an inch.
* WHERE...Central Columbia River Gorge.
* WHEN...From 10 AM Thursday to 10 AM PST Friday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.
* ADDITIONAL DETAILS...The best chances for freezing rain
accumulation will occur around the Hood River and White Salmon
area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.
Be prepared for slippery roads. Slow down and use caution while
driving. If you are going outside, watch your first few steps taken
on stairs, sidewalks, and driveways. These surfaces could be icy and
slippery, increasing your risk of a fall and injury.
Have a winter emergency driving kit readily available. Common items
to include: flashlight, batteries, blankets, a shovel, water,
non-perishable food items, tire chains, etc.
Be aware that walking surfaces may be slick. Walk with extra care.
For the latest road conditions and chain restrictions in Oregon,
call 5 1 1, or visit: www.tripcheck.com.
For the latest road conditions and chain restrictions in Washington,
visit: wsdot.com/travel/real-time/map
&&
$$
For more information from the National Weather Service visit
www.weather.gov/portland
ts
Air Stagnation Advisory
URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
252 PM PST Wed Dec 31 2025
ORZ044-507-508-510-511-WAZ026>029-012000-
/O.CON.KPDT.AS.Y.0002.000000T0000Z-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 Fossil, Prosser, Waitsburg, Walla Walla,
Prineville, Pendleton, Condon, Ione, Naches, Madras, Yakima,
Dufur, Bend, Tri-Cities, Redmond, Hermiston, Moro, Boardman,
Pilot Rock, Heppner, Dayton, Sunnyside, Connell, Maupin,
Ellensburg, Toppenish, Athena, and Thorp
252 PM PST Wed Dec 31 2025
...AIR STAGNATION ADVISORY REMAINS 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.
&&
$$
MC
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
130 PM MST Wed Dec 31 2025
IDZ011>014-028-033-ORZ061-063-064-012200-
/O.CON.KBOI.AS.Y.0005.000000T0000Z-260103T1500Z/
West Central Mountains-Lower Treasure Valley-Boise Mountains-
Upper Treasure Valley-Camas Prairie-Upper Weiser River-Harney
County-Malheur County-Oregon Lower Treasure Valley-
Including the cities of Corral, Venator, Bear, Prairie, Pine,
McCall, Ola, Big Creek, Ontario, Malheur City, Glendale,
Buchanan, Diamond, Cuprum, Cascade, Crane, Dunnean, Council,
Boise, Fairfield, Blaine, Warm Lake, Cambridge, Nampa, Selby,
Hill City, Indian Valley, Caldwell, Burns, Soldier, New
Princeton, Goodrich, Fruitvale, Anderson Dam, Nyssa, and Mesa
130 PM MST Wed Dec 31 2025 /1230 PM PST Wed Dec 31 2025/
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST /7 AM
PST/ SATURDAY...
* WHAT...An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that will continue to trap pollutants.
* WHERE...Portions of southwest Idaho and southeast Oregon.
* WHEN...Until 8 AM MST /7 AM PST/ Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.
&&
$$
JB
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.
&&
$$
JW
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1123 AM PST Mon Dec 29 2025
IDZ005>008-012000-
/O.NEW.KMSO.AS.Y.0002.251229T2000Z-260101T2000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
Orofino/Grangeville Region-Lower Hells Canyon/Salmon River Region-
1123 AM PST Mon Dec 29 2025
...AIR STAGNATION ADVISORY IN EFFECT UNTIL NOON PST THURSDAY...
* WHAT...Stagnation conditions will trap pollutants, leading to
deteriorating air quality.
* WHERE...Lower Hells Canyon/Salmon River Region,
Orofino/Grangeville Region, Southern Clearwater Mountains, and
Northern Clearwater Mountains.
* WHEN...Until noon PST Thursday.
* IMPACTS...Periods of air stagnation can lead to the build up of
pollutants near the surface.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.
According to state air quality agencies, prolonged period of
stagnant air can hold pollutants close to the ground where people
live and breathe. Check with your local burn agency for any current
restrictions in your area.
&&
$$
