WWA Summary for Winter Storm Warning Issued by PIH

Winter Storm Warning

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pocatello ID
143 PM MST Fri Dec 5 2025

IDZ058>066-061200-
/O.CON.KPIH.WS.W.0008.000000T0000Z-251206T1200Z/
Marsh and Arbon Highlands-Franklin/Eastern Oneida Region-Bear
River Range-Bear Lake Valley-Blackfoot Mountains-Caribou Range-
Big Hole Mountains-Teton Valley-Centennial Mountains - Island
Park-
Including the cities of Malad, Thatcher, McCammon, Tetonia,
Inkom, Downey, Victor, Ashton, Montpelier, Lava Hot Springs,
Grace, Swan Valley, Emigration Summit, Georgetown, Island Park,
Driggs, Wayan, Bone, Soda Springs, Henry, St. Charles, Preston,
and Kilgore
143 PM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY...

* WHAT...Heavy snow generally above valley floors. Additional snow
  accumulations of 6 to 10 inches above 6500 ft elevation. The Bear
  River and Caribou Ranges could see additional accumulations of 12
  to 18 inches. Very gusty winds overnight may cause areas of
  blowing and drifting snowfall.

* WHERE...Big Hole Mountains, Centennial Mountains - Island Park,
  Teton Valley, Bear Lake Valley, Bear River Range, Blackfoot
  Mountains, Caribou Range, Franklin/Eastern Oneida Region, and
  Marsh and Arbon Highlands.

* WHEN...Until 5 AM MST Saturday.

* IMPACTS...Travel could be very difficult to impossible. The
  hazardous conditions could impact the Friday evening commute.
  Gusty winds could bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. Call 5 1 1 or visit
511.idaho.gov for the latest road conditions.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
518 PM MST Fri Dec 5 2025

MTZ317-320-330-061315-
/O.CON.KTFX.WS.W.0019.000000T0000Z-251206T2100Z/
Little Belt and Highwood Mountains-Big Belt, Bridger and Castle
Mountains-Gallatin and Madison County Mountains and Centennial
Mountains-
Including the following locations: West Yellowstone, Trident,
Monarch, Battle Ridge Pass, Neihart, Bozeman Pass, Raynolds Pass,
Kings Hill Pass, Big Sky, Targhee Pass, Maudlow, and Deep Creek
Pass
518 PM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY...

* WHAT...Heavy snow. Additional snow accumulations between 4 and 11
  inches. Isolated higher amounts. Winds gusting as high as 45 mph.

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

* WHEN...Until 2 PM MST Saturday.

* IMPACTS...Tire chains may be required for some vehicles if
  traveling through mountain passes. Blowing snow could
  significantly reduce visibility. Gusty winds could bring down tree
  branches.

* ADDITIONAL DETAILS...Significant travel impacts to the Friday
  evening commute are possible for Bozeman Pass and along Highway
  191 south of Bozeman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 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
518 PM MST Fri Dec 5 2025

MTZ327-061315-
/O.CON.KTFX.WS.W.0019.000000T0000Z-251207T0000Z/
Northwest Beaverhead County-
Including the following locations: Wisdom, Wise River, Dewey,
Chief Joseph Pass, and Big Hole Pass
518 PM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY...

* WHAT...Heavy snow. Additional snow accumulations between 5 and 13
  inches. Isolated higher amounts. Winds gusting as high as 50 mph.

* WHERE...Northwest Beaverhead County.

* WHEN...Until 5 PM MST Saturday.

* IMPACTS...Travel could be very difficult and tire chains may be
  required for some vehicles. Those in the backcountry should ensure
  they are prepared for dangerous conditions. Blowing snow could
  significantly reduce visibility. Gusty winds could bring down tree
  branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 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 Missoula MT
402 PM MST Fri Dec 5 2025

MTZ006-062315-
/O.CON.KMSO.WS.W.0012.000000T0000Z-251207T0000Z/
Bitterroot/Sapphire Mountains-
402 PM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY...

* WHAT...Heavy snow expected. There is a likelihood of major winter
  storm impacts. Total snow accumulations 1 to 5 inches in the
  valleys and 8 to 15 inches in the higher terrain including Lolo
  and Lost Trail Passes. Winds gusting as high as 40 mph on Friday.

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

* WHEN...Until 5 PM MST Saturday.

* IMPACTS...For MAJOR winter weather impacts, expect considerable
  disruptions to normal activities. Dangerous or impossible
  traveling conditions. Avoid travel in the impacted areas if
  possible. Widespread closures and disruptions to infrastructure
  may occur. The hazardous conditions could impact the Friday
  evening commute, especially over higher passes. Gusty winds could
  bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 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
402 PM MST Fri Dec 5 2025

IDZ005-006-062315-
/O.CON.KMSO.WS.W.0012.000000T0000Z-251207T0000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
302 PM PST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST SATURDAY...

* WHAT...Heavy snow. There is a likelihood of developing or ongoing
  major winter weather impacts to isolated extreme winter storm
  impacts. Additional snow accumulations up to 13 inches at higher
  elevations including Lolo Pass and 1 to 5 inches at low
  elevations. Winds gusting as high as 35 mph.

* WHERE...Dixie, Elk City, Highway 12 Lowell to Lolo Pass, Elk
  River, Highway 11 Pierce to Headquarters, and Pierce.

* WHEN...Until 4 PM PST Saturday.

* IMPACTS...For MAJOR winter weather impacts, expect considerable
  disruptions to normal activities. Dangerous or impossible
  traveling conditions. Avoid travel in the impacted areas if
  possible. Widespread closures and disruptions to infrastructure
  may occur. For EXTREME winter storm impacts, expect substantial
  disruptions to normal activities. Extremely dangerous or
  impossible traveling conditions. Travel in the impacted areas is
  not advised. Extensive and widespread closures and disruptions to
  infrastructure may occur. Life saving actions may be needed. The
  hazardous conditions could impact the Friday evening commute,
  especially over higher passes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 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 Billings MT
229 PM MST Fri Dec 5 2025

MTZ067-068-062100-
/O.CON.KBYZ.WS.W.0017.000000T0000Z-251206T2100Z/
Absaroka/Beartooth Mountains-Crazy Mountains-
Including the locations of Cooke City
229 PM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY...

* WHAT...Periods of moderate to heavy snowfall, strong winds, and
  blowing snow. Additional snow accumulations between 6 and 14
  inches. Winds gusting as high as 75 mph.

* WHERE...Absaroka/Beartooth Mountains and Crazy Mountains.

* WHEN...Until 2 PM MST Saturday.

* IMPACTS...Mountain recreation will be impacted by heavy
  accumulating snow and blowing snow. Whiteout conditions are
  expected at times.

* ADDITIONAL DETAILS...The heaviest snowfall will occur on west and
  northwest facing slopes. The mountains around Red Lodge and Nye
  will see much less snowfall, 2 to 6 inches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Those in the backcountry should ensure they are prepared for
dangerous winter conditions.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1253 PM MST Fri Dec 5 2025

WYZ012-024-061300-
/O.CON.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/
Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges-
1253 PM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY...

* WHAT...Heavy snow. Additional snow accumulations between 6 to 12
  inches with higher elevations seeing an additional foot or two of
  snow. Winds gusting as high as 60 mph.

* WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming
  Ranges.

* WHEN...Until 2 PM MST Saturday.

* IMPACTS...Travel could be very difficult, especially over Teton,
  Togwotee, and Salt River Passes. The hazardous conditions could
  impact the Friday evening commute.

* ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday
  evening and continues through the overnight hours, this is when a
  bulk of the snow accumulations will occur. Gusty west winds of 25
  to 40 mph, and possibly above 45 mph across higher elevations,
  occur after sunset Friday and continue into Saturday morning.
  Heavy snowfall and gusty winds could cause reduced visibility and
  drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

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 .

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
1059 AM MST Fri Dec 5 2025

UTZ110-111-060900-
/O.CON.KSLC.WS.W.0007.000000T0000Z-251207T1200Z/
Wasatch Mountains I-80 North-Wasatch Mountains South of I-80-
Including the following locations - Brighton, Alta, Mantua, and
Logan Summit
1059 AM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SUNDAY...

* WHAT...Heavy snow. Total snow accumulations between 1 and 3 feet.

* WHERE...The Wasatch Mountains.

* WHEN...Until 5 AM MST Sunday.

* IMPACTS...Winter driving conditions can be expected on all
  mountain routes. Traction restrictions are likely. Very low
  visibility in blowing and drifting snow is likely near Logan
  Summit.

* ADDITIONAL DETAILS...The heaviest period of snow will be Friday
  evening into Saturday morning, with rates exceeding 2 inches per
  hour at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. For winter road conditions
from the Utah Department of Transportation, visit
http://www.udottraffic.utah.gov.

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
1059 AM MST Fri Dec 5 2025

UTZ108-060900-
/O.CON.KSLC.WS.W.0007.000000T0000Z-251207T1200Z/
Wasatch Back-
Including the following locations - Huntsville, Heber City, and
Park City
1059 AM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 6 to
  16 inches above 5500 feet, 2 to 6 inches below 5500 feet.

* WHERE...Wasatch Back.

* WHEN...Until 5 AM MST Sunday.

* IMPACTS...Winter driving conditions can be expected on most
  routes, especially those in the Park City area and during the
  Friday morning and evening commutes.

* ADDITIONAL DETAILS...Two scenarios exist for this storm across the
  Wasatch Back regarding precipitation type. If temperatures remain
  near to below freezing through Friday evening below 5500 feet,
  snow accumulations will be at the higher range. If temperatures
  warm above freezing Friday morning, accumulations below 5500 feet
  will shift toward the lower end of the range.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. For winter road conditions
from the Utah Department of Transportation, visit
http://www.udottraffic.utah.gov.

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
1059 AM MST Fri Dec 5 2025

UTZ112-113-117-060900-
/O.CON.KSLC.WS.W.0007.000000T0000Z-251207T1200Z/
Western Uinta Mountains-Wasatch Plateau/Book Cliffs-Central
Mountains-
Including the following locations - Mirror Lake Highway, Indian
Canyon, Joes Valley, Scofield, Cove Fort, Fish Lake, and Moon
Lake
1059 AM MST Fri Dec 5 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 1 to 2
  feet, except 4 to 8 inches south of Manti.

* WHERE...Central Mountains, Wasatch Plateau/Book Cliffs, and
  Western Uinta Mountains.

* WHEN...Until 5 AM MST Sunday.

* IMPACTS...Winter driving conditions can be expected on all
  mountain routes with significant impacts to conditions on Soldier
  Summit.


* ADDITIONAL DETAILS...The heaviest period of snow will be Friday
  evening into Saturday morning, with rates exceeding 1 to 2 inches
  per hour at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. For winter road conditions
from the Utah Department of Transportation, visit
http://www.udottraffic.utah.gov.

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

&&

$$