WWA Summary for Winter Weather Advisory Issued by BYZ

Winter Weather Advisory

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
200 AM MST Mon Dec 1 2025

MTZ301-307-020000-
/O.CON.KTFX.WW.Y.0051.251202T0000Z-251203T0600Z/
East Glacier Park Region-Southern Rocky Mountain Front-
Including the following locations: Babb, Kiowa, Saint Mary,
Marias Pass, East Glacier Park, Rogers Pass, and Logan Pass
200 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 PM MST TUESDAY...

* WHAT...Snow expected. Total snow accumulations between 2 and 5
  inches. Winds gusting as high as 45 mph.

* WHERE...The Continental Divide along the Rocky Mountain Front.

* WHEN...From 5 PM this afternoon to 11 PM MST Tuesday.

* IMPACTS...Plan on slippery road conditions. Localized blowing snow
  could significantly reduce visibility. Very strong winds could
  cause extensive tree damage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road
conditions can be obtained by calling 5 1 1 or visiting the MDT Road
Report website.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
200 AM MST Mon Dec 1 2025

MTZ312>316-319-020000-
/O.EXB.KTFX.WW.Y.0051.251202T1200Z-251203T1200Z/
Cascade County below 5000ft-Judith Basin County and Judith Gap-
Fergus County below 4500ft-Upper Blackfoot and MacDonald Pass-
Gates of the Mountains-Helena Valley-
Including the following locations: Moccasin, MacDonald Pass,
Geyser, Lewistown, Raynesford, Lincoln, Great Falls, Flesher
Pass, Helena, Hobson, Windham, Craig, Wolf Creek, Stanford,
Canyon Creek, Marysville, Hilger, and Benchland
200 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TUESDAY TO 5 AM MST
WEDNESDAY...

* WHAT...Snow expected. Total snow accumulations up to 4 inches.
  Winds gusting as high as 35 mph.

* WHERE...Portions of central and north central Montana.

* WHEN...From 5 AM Tuesday to 5 AM MST Wednesday.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions could impact the Tuesday morning and evening commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road
conditions can be obtained by calling 5 1 1 or visiting the MDT Road
Report website.

Remember, a Winter Weather Advisory means that there is at least an
80% chance of minor impacts due to winter weather conditions during
the advisory period.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
200 AM MST Mon Dec 1 2025

MTZ317-318-320-330-020000-
/O.CON.KTFX.WW.Y.0051.251202T0600Z-251203T1200Z/
Little Belt and Highwood Mountains-Snowy and Judith Mountains-Big
Belt, Bridger and Castle Mountains-Gallatin and Madison County
Mountains and Centennial Mountains-
Including the following locations: Big Sky, Raynolds Pass,
Monarch, Battle Ridge Pass, Bozeman Pass, Deep Creek Pass, West
Yellowstone, Trident, Targhee Pass, Maudlow, Neihart, and Kings
Hill Pass
200 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 PM THIS EVENING
TO 5 AM MST WEDNESDAY...

* WHAT...Snow expected. Total snow accumulations will range from 2
  to 4 inches across the lower elevations to 5 to 10 inches over the
  passes and higher terrain. Winds gusting as high as 40 mph.

* WHERE...The Highwood, Little Belt, Judith, and Snowy Mountains,
  Big Belt, Bridger and Castle Mountains, and Gallatin and Madison
  County Mountains and Centennial Mountains.

* WHEN...From 11 PM this evening to 5 AM MST Wednesday.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road
conditions can be obtained by calling 5 1 1 or visiting the MDT Road
Report website.


&&

$$

Ludwig

URGENT - WINTER WEATHER MESSAGE
National Weather Service Spokane WA
1250 AM PST Mon Dec 1 2025

IDZ004-012100-
/O.NEW.KOTX.WW.Y.0031.251201T2100Z-251202T1900Z/
Central Panhandle Mountains-
Including the cities of Lookout Pass, Osburn, Wallace, Fernwood,
Pinehurst, St. Maries, Fourth Of July Pass, Mullan, Dobson Pass,
and Kellogg
1250 AM PST Mon Dec 1 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO 11
AM PST TUESDAY...

* WHAT...Snow expected. Total snow accumulations between 2 and 4
  inches with locally higher amounts up to 6 inches in southern
  Shoshone County mountains.

* WHERE...Lookout Pass, Osburn, Wallace, Fernwood, Pinehurst, St.
  Maries, Fourth Of July Pass, Mullan, Dobson Pass, and Kellogg.

* WHEN...From 1 PM this afternoon to 11 AM PST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions could impact the Monday evening and Tuesday morning
  commutes.

* ADDITIONAL DETAILS...Snow accumulations through 10 PM PST Monday
  will be light and amount to an inch or less. The majority of the
  snow will fall late Monday night through Tuesday morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. For the latest road
information in Idaho, call 5 1 1.

&&

$$

AS

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
118 AM MST Mon Dec 1 2025

IDZ006-020830-
/O.EXB.KMSO.WW.Y.0045.251202T0300Z-251203T0000Z/
Southern Clearwater Mountains-
1218 AM PST Mon Dec 1 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 7 PM MONDAY TO 4 PM PST
TUESDAY...

* WHAT...Snow expected. There is a likelihood of minor to moderate
  winter weather impacts. Total snow accumulations up to 7 inches
  for Lolo Pass. 1 to 2 inches for the lower elevations along
  Highway 12.

* WHERE...Highway 12 Lowell to Lolo Pass, Dixie, and Elk City.

* WHEN...From 7 PM Monday to 4 PM PST Tuesday.

* IMPACTS...For MODERATE winter weather impacts, expect disruptions
  to normal activities. Hazardous traveling conditions. Use extra
  caution while driving. Closures and disruptions to infrastructure
  may occur. The hazardous conditions could impact the Tuesday
  morning commute, especially over higher passes.

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.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
118 AM MST Mon Dec 1 2025

MTZ001-020830-
/O.CON.KMSO.WW.Y.0045.251201T2000Z-251202T1900Z/
Kootenai/Cabinet Region-
118 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 PM THIS
AFTERNOON TO NOON MST TUESDAY...

* WHAT...Snow expected. There is a likelihood of minor to moderate
  winter weather impacts. Total snow accumulations between 2 and 5
  inches. Daytime melting combined with sub-freezing temperatures
  expected after dark will create a potential for black ice.
  Conditions will become slicker Monday night.

* WHERE...Highway 93 Eureka to Whitefish, Highway 37 Eureka to
  Libby, Highway 56 Bull Lake Road, and Highway 2 Kalispell to Libby.

* WHEN...From 1 PM this afternoon to noon MST Tuesday.

* IMPACTS...For MINOR winter weather impacts, expect a few
  inconveniences to normal activities. For MODERATE winter weather
  impacts, expect disruptions to normal activities. Use caution
  while driving. Winter traveling conditions. The hazardous
  conditions could impact the Monday evening and Tuesday morning
  commutes.

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.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
118 AM MST Mon Dec 1 2025

MTZ002-043-020830-
/O.CON.KMSO.WW.Y.0045.251201T2100Z-251203T0000Z/
West Glacier Region-Potomac/Seeley Lake Region-
118 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM THIS
AFTERNOON TO 5 PM MST TUESDAY...

* WHAT...Snow expected. There is a likelihood of minor to moderate
  winter weather impacts. Total snow accumulations between 3 and 7
  inches, except up to 10 inches in the Seeley-Swan Valley. Daytime
  melting combined with sub-freezing temperatures expected after
  dark will create a potential for black ice. Conditions will become
  slicker Monday night.

* WHERE...Glacier National Park, Bad Rock Canyon, Marias Pass,
  Highway 200 Bonner to Greenough, I-90 East Missoula to Bearmouth,
  Essex, Polebridge, Highway 83 Bigfork to Swan Lake, and Highway 83
  Seeley Lake to Condon.

* WHEN...From 2 PM this afternoon to 5 PM MST Tuesday.

* IMPACTS...For MODERATE winter weather impacts, expect disruptions
  to normal activities. Hazardous traveling conditions. Use extra
  caution while driving. Closures and disruptions to infrastructure
  may occur. The hazardous conditions could impact the Monday
  evening and Tuesday morning commutes, especially over higher
  passes.

* ADDITIONAL DETAILS...Between 10 and 16 inches of total snow
  accumulation is possible in the Mission and Swan Ranges, while the
  Whitefish and Lewis Ranges could receive 5 to 10 inches.

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.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
118 AM MST Mon Dec 1 2025

MTZ003-020830-
/O.CON.KMSO.WW.Y.0045.251201T2100Z-251202T1900Z/
Flathead/Mission Valleys-
118 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM THIS
AFTERNOON TO NOON MST TUESDAY...

* WHAT...Snow expected. There is a likelihood of minor to moderate
  winter weather impacts. Total snow accumulations between 2 and 5
  inches, except 5 to 8 inches Bigfork to Many Lakes Region. Daytime
  melting combined with sub-freezing temperatures expected after
  dark will create a potential for black ice. Conditions will become
  slicker Monday night.

* WHERE...Flathead Valley, Polson, Mission Valley, and Flathead Lake.

* WHEN...From 2 PM this afternoon to noon MST Tuesday.

* IMPACTS...For MODERATE winter weather impacts, expect disruptions
  to normal activities. Hazardous traveling conditions. Use extra
  caution while driving. Closures and disruptions to infrastructure
  may occur. The hazardous conditions could impact the Monday
  evening and Tuesday morning commutes, especially over higher
  passes.

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.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
118 AM MST Mon Dec 1 2025

MTZ004-020830-
/O.CON.KMSO.WW.Y.0045.251201T2100Z-251202T1900Z/
Lower Clark Fork Region-
118 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM THIS
AFTERNOON TO NOON MST TUESDAY...

* WHAT...Snow expected. There is a likelihood of minor to moderate
  winter weather impacts. Total snow accumulations between 2 and 5
  inches. Daytime melting combined with sub-freezing temperatures
  expected after dark will create a potential for black ice.
  Conditions will become slicker Monday night.

* WHERE...I-90 Lookout Pass to Haugan, Highway 200 Trout Creek to
  Heron, Highway 200 Thompson Falls to Plains, and Evaro Hill.

* WHEN...From 2 PM this afternoon to noon MST Tuesday.

* IMPACTS...For MINOR winter weather impacts, expect a few
  inconveniences to normal activities. For MODERATE winter weather
  impacts, expect disruptions to normal activities. Use caution
  while driving. Winter traveling conditions. The hazardous
  conditions could impact the Monday evening and Tuesday morning
  commutes, especially over higher passes.

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.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
118 AM MST Mon Dec 1 2025

MTZ005-020830-
/O.EXB.KMSO.WW.Y.0045.251202T0300Z-251202T2100Z/
Missoula/Bitterroot Valleys-
118 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 2 PM
MST TUESDAY...

* WHAT...Snow expected. There is a chance of minor winter weather
  impacts. Total snow accumulations 1 to 4 inches. Daytime melting
  combined with sub-freezing temperatures expected after dark will
  create a potential for black ice. The Tuesday morning commute
  could be impacted with slick snow covered roads.

* WHERE...Bitterroot Valley and Missoula.

* WHEN...From 8 PM this evening to 2 PM MST Tuesday.

* IMPACTS...For MINOR winter weather impacts, expect a few
  inconveniences to normal activities. Use caution while driving.
  Winter traveling conditions. The hazardous conditions could impact
  the Tuesday morning commute, especially over higher passes.

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.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
118 AM MST Mon Dec 1 2025

MTZ006-020830-
/O.EXB.KMSO.WW.Y.0045.251202T0300Z-251203T0000Z/
Bitterroot/Sapphire Mountains-
118 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 5 PM
MST TUESDAY...

* WHAT...Snow expected. There is a likelihood of minor to moderate
  winter weather impacts. Total snow accumulations 4 to 7 inches.

* WHERE...Lolo Pass and Highway 93 Sula to Lost Trail Pass.

* WHEN...From 8 PM this evening to 5 PM MST Tuesday.

* IMPACTS...For MINOR winter weather impacts, expect a few
  inconveniences to normal activities. Use caution while driving.
  Winter traveling conditions. The hazardous conditions could impact
  the Tuesday morning and evening commutes, especially over higher
  passes.

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.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1221 AM MST Mon Dec 1 2025

WYZ012-012300-
/O.NEW.KRIW.WW.Y.0033.251202T0600Z-251203T0600Z/
Teton and Gros Ventre Mountains-
1221 AM MST Mon Dec 1 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM TONIGHT TO 11 PM MST
TUESDAY...

* WHAT...Snow expected. Total snow accumulations of 6 to 10 inches
  over the Tetons. Winds gusting as high as 35 mph will occur with
  the snow. Accumulations between 2 and 6 inches elsewhere in the
  zone. Wind gusts of 25 to 35 mph will be more widespread across
  the zone Tuesday afternoon.

* WHERE...Teton and Gros Ventre Mountains.

* WHEN...From 11 PM this evening to 11 PM MST Tuesday.

* IMPACTS...Travel could be difficult, especially over Teton Pass.
  The hazardous conditions could impact the Tuesday morning and
  evening commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .

For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .

&&

$$

For more information from the National Weather Service, visit
https://weather.gov/riw/ .

TL