Winter Storm Warning 3, NWS Missoula, MT

971 
WWUS45 KMSO 032015
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
115 PM MST Mon Feb 3 2025

MTZ004-042015-
/O.UPG.KMSO.WW.Y.0008.000000T0000Z-250205T1800Z/
/O.EXB.KMSO.WS.W.0003.250204T0300Z-250205T1800Z/
Lower Clark Fork Region-
115 PM MST Mon Feb 3 2025

...WINTER STORM WARNING IN EFFECT FROM 8 PM THIS EVENING TO 11 AM 
MST WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow expected. Likelihood 
  of major impacts from snow is up to 80 percent. Total snow 
  accumulations between 6 and 10 inches, except 10 to 18 inches east 
  of St. Regis to Alberton, and 16 to 24 inches at Evaro Hill.

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

* WHEN...From 8 PM this evening to 11 AM MST Wednesday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Whiteout conditions are expected and will make 
  travel treacherous and potentially life-threatening. For MAJOR 
  impacts from snow, 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 Monday evening and Tuesday morning commutes, 
  especially over higher passes.

* ADDITIONAL DETAILS...There are two general periods of heavy snow 
  rates of 1 to 2 inch per hour: the first is tonight through 
  Tuesday morning, and then later Tuesday into Wednesday morning. 
  The blowing and drifting will be the worst along I-90 east of 
  Superior. North to east winds of 10 to 25 mph are expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

IDZ007-042015-
/O.EXB.KMSO.WS.W.0003.250204T1400Z-250205T1800Z/
/O.EXT.KMSO.WW.Y.0009.250204T0100Z-250204T1400Z/
Orofino/Grangeville Region-
1215 PM PST Mon Feb 3 2025

...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 5 PM THIS AFTERNOON TO 
6 AM PST TUESDAY...
...WINTER STORM WARNING IN EFFECT FROM 6 AM TUESDAY TO 10 AM PST 
WEDNESDAY...

* WHAT...For the Winter Weather Advisory, snow expected. Likelihood 
  of moderate impacts from 3 to 6 inches of snow is 60 percent. For 
  the Winter Storm Warning, heavy snow expected. Likelihood of major 
  impacts from 6 to 10 inches or more of snow is 90 percent, and 10 
  to 18 inches of snow is 40 percent.

* WHERE...Grangeville and vicinity, Orofino, Greer Grade, and Camas 
  Prairie.

* WHEN...For the Winter Weather Advisory, from 5 PM this afternoon 
  to 6 AM PST Tuesday. For the Winter Storm Warning, from 6 AM 
  Tuesday to 10 AM PST Wednesday.

* IMPACTS...Travel may be treacherous and potentially 
  life-threatening. For MAJOR impacts from snow, 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.


&&

$$

MTZ003-042015-
/O.UPG.KMSO.WS.A.0001.250204T1200Z-250205T1800Z/
/O.EXB.KMSO.WS.W.0003.250204T0300Z-250205T1600Z/
Flathead/Mission Valleys-
115 PM MST Mon Feb 3 2025

...WINTER STORM WARNING IN EFFECT FROM 8 PM THIS EVENING TO 9 AM MST 
WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow expected. Total snow 
  accumulations between 4 and 8 inches in the Flathead Valley, 12 to 
  18 inches southern half of Flathead Lake, Mission Valley, and up 
  to 2 feet in Arlee.

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

* WHEN...From 8 PM this evening to 9 AM MST Wednesday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Whiteout conditions are expected at times from 
  Flathead Lake to the Mission valley, and will make travel 
  treacherous and potentially life-threatening. Winter traveling 
  conditions. For MAJOR impacts from snow, 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 Tuesday 
  morning and evening commutes, especially over higher passes.

* ADDITIONAL DETAILS...There may be a brief lull during the day on 
  Tuesday, but another round of heavy snow will develop Tuesday 
  night. Heavy drifting snow can be expected on US-93 and Highway 35 
  around Flathead Lake, and Highway 28 between Elmo and Hot Springs. 
  North to east winds of 15 to 25 mph are expected. There is a 40 
  percent chance for wind gusts to 35 mph with more significant 
  blowing or drifting snow in the Flathead Valley Tuesday night. 
  Bitterly cold wind chills as low as 15 below zero.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

IDZ008-042015-
/O.EXB.KMSO.WS.W.0003.250204T1500Z-250205T1800Z/
Lower Hells Canyon/Salmon River Region-
1215 PM PST Mon Feb 3 2025

...WINTER STORM WARNING IN EFFECT FROM 7 AM TUESDAY TO 10 AM PST 
WEDNESDAY...

* WHAT...Heavy snow expected. Likelihood of major impacts from 6 to 
  10 inches or more of snow is 80 percent, and 10 to 18 inches of 
  snow is 20 percent. Heaviest snowfall will occur in the higher 
  elevations. Total accumulation in Riggins is 4 to 6 inches, and 1 
  to 3 inches in Hells Canyon.

* WHERE...Highway 95 Slate Creek to Riggins and White Bird Grade.

* WHEN...From 7 AM Tuesday to 10 AM PST Wednesday.

* IMPACTS...Roads, and especially bridges and overpasses, will 
  likely become slick and hazardous. For MAJOR impacts from snow, 
  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 Tuesday morning and evening commutes, especially over ridges.

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.

Persons should delay all travel if possible. If travel is absolutely 
necessary, drive with extreme caution and be prepared for sudden 
changes in visibility. Leave plenty of room between you and the 
motorist ahead of you, and allow extra time to reach your 
destination. Avoid sudden braking or acceleration, and be especially 
cautious on hills or when making turns. Make sure your car is 
winterized and in good working order.

&&

$$

MTZ005-042015-
/O.EXT.KMSO.WS.W.0003.250204T0000Z-250205T1800Z/
Missoula/Bitterroot Valleys-
115 PM MST Mon Feb 3 2025

...WINTER STORM WARNING NOW IN EFFECT FROM 5 PM THIS AFTERNOON TO 11 
AM MST WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow expected. Likelihood 
  of major to extreme impacts from 6 to 10 inches or more of snow is 
  80 percent, and 10 to 18 inches of snow is 50 percent.

* WHERE...Missoula and Bitterroot Valley.

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

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Whiteout conditions are expected and will make 
  travel treacherous and potentially life-threatening. For MAJOR 
  impacts from snow, 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 Monday evening, Tuesday morning, and Tuesday 
  evening commutes.

* ADDITIONAL DETAILS...There are two general periods of heavy snow 
  rates of 1 to 2 inch per hour: the first is tonight through 
  Tuesday morning, and then later Tuesday into Wednesday morning. 
  North to east winds of 10 to 25 mph are expected. Gusts to 35 mph 
  are possible near Hellgate Canyon. There is a 15 percent chance 
  that freezing rain could occur in the southern Bitterroot Valley 
  on Tuesday.

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.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

IDZ005-042015-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Northern Clearwater Mountains-
1215 PM PST Mon Feb 3 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST 
WEDNESDAY...

* WHAT...Heavy snow. Likelihood of developing or ongoing major to 
  extreme impacts from 6 to 10 inches or more of snow is 90 percent, 
  and 10 to 18 inches of snow is 50 percent.

* WHERE...Highway 11 Pierce to Headquarters, Elk River, and Pierce.

* WHEN...Until 10 AM PST Wednesday.

* IMPACTS...Roads, and especially bridges and overpasses, will 
  likely become slick and hazardous. Whiteout conditions are 
  expected and will make travel treacherous and potentially 
  life-threatening. For MAJOR impacts from snow, 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 Monday 
  evening and Tuesday morning commutes, especially over higher 
  passes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

IDZ006-042015-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Southern Clearwater Mountains-
1215 PM PST Mon Feb 3 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST 
WEDNESDAY...

* WHAT...Heavy snow. Likelihood of developing or ongoing major to 
  extreme impacts from 6 to 10 inches or more of snow is 100 
  percent, and 10 to 18 inches of snow is 70 percent.

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

* WHEN...Until 10 AM PST Wednesday.

* IMPACTS...Winter travel conditions. For MAJOR impacts from snow, 
  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 Monday morning and evening commutes, especially over higher 
  passes.

* ADDITIONAL DETAILS...Watch out for tree damage from heavy snow 
  along US-12 between Lolo Pass and Lowell. Snowfall rates of 1 to 2 
  inch per hour are likely during the day Tuesday and Tuesday night. 
  Easterly winds of 10 to 20 mph are likely along US-12.

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.

&&

$$

MTZ006-042015-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Bitterroot/Sapphire Mountains-
115 PM MST Mon Feb 3 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Heavy snow. Likelihood of developing or ongoing major to 
  extreme impacts from 6 to 10 inches or more of snow is 100 
  percent, and 10 to 18 inches of snow is 70 percent.

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

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...Roads, and especially bridges and overpasses, will 
  likely become slick and hazardous. Visibilities may drop below 1/4 
  mile due to falling and blowing snow. Whiteout conditions are 
  expected and will make travel treacherous and potentially 
  life-threatening. For MAJOR impacts from snow, 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 Monday 
  evening and Tuesday morning commutes, especially over higher 
  passes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

MTZ007-042015-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Butte/Blackfoot Region-
115 PM MST Mon Feb 3 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow. Likelihood of 
  developing or ongoing major impacts from snow is up to 80 percent. 
  Snow accumulations between 8 and 16 inches Drummond to Ovando, and 
  Georgetown Lake; 6 to 12 inches elsewhere.

* WHERE...MacDonald Pass, Highway 12 Garrison to Elliston, Butte, 
  Homestake Pass, and Georgetown Lake.

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...For MAJOR impacts from snow, 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 Monday 
  evening and Tuesday morning commutes, especially over higher 
  passes.

* ADDITIONAL DETAILS...Localized blizzard conditions are possible 
  between Garrison Junction and Elliston on US-12, Highway 200 east 
  of Ovando to Helmville, and Highway 141. Also drifting snow may 
  make these locations impassable at times. Dangerously cold wind 
  chills between 15 and 30 below zero.

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.

&&

$$

MTZ043-042015-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Potomac/Seeley Lake Region-
115 PM MST Mon Feb 3 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow. Likelihood of 
  developing or ongoing major to extreme impacts from 6 to 10 inches 
  or more of snow is 100 percent, and 10 to 18 inches of snow is 70 
  percent.

* WHERE...Highway 83 Seeley Lake to Condon, Highway 200 Bonner to 
  Greenough, and I-90 East Missoula to Bearmouth.

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...Winter travel conditions. For MAJOR impacts from snow, 
  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 Monday evening and Tuesday morning commutes, especially over 
  higher passes.

* ADDITIONAL DETAILS...Easterly winds of 15 to 25 mph are expected 
  in the channeled terrain.

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.

&&

$$

MTZ001-042015-
/O.NEW.KMSO.WW.Y.0010.250204T0600Z-250205T0000Z/
/O.EXT.KMSO.WS.A.0002.250205T0000Z-250205T1800Z/
Kootenai/Cabinet Region-
115 PM MST Mon Feb 3 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 5 PM 
MST TUESDAY...
...WINTER STORM WATCH NOW IN EFFECT FROM TUESDAY AFTERNOON THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Winter Weather Advisory, snow expected. Likelihood 
  of minor to moderate impacts from around 1 to 3 inches of snow is 
  90 percent, and 3 to 6 inches of snow is 40 percent. For the 
  Winter Storm Watch, heavy snow and blowing snow possible. Chance 
  of moderate to major impacts from snow is at least 50 percent. 
  Total snow accumulations between 5 and 10 inches possible between 
  Libby and Marion.

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

* WHEN...For the Winter Weather Advisory, from 11 PM this evening to 
  5 PM MST Tuesday. For the Winter Storm Watch, from Tuesday 
  afternoon through Wednesday morning.

* IMPACTS...For MODERATE impacts from snow, expect disruptions to 
  normal activities. Hazardous traveling conditions. Use extra 
  caution while driving. Closures and disruptions to infrastructure 
  may occur. For MAJOR impacts from snow, 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 Tuesday 
  morning and evening commutes, especially over higher passes.

* ADDITIONAL DETAILS...Gusty easterly winds between 10 and 20 mph 
  will bring blowing and drifting snow.

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.

Monitor the latest forecasts for updates on this situation.

Persons should delay all travel if possible. If travel is absolutely 
necessary, drive with extreme caution and be prepared for sudden 
changes in visibility. Leave plenty of room between you and the 
motorist ahead of you, and allow extra time to reach your 
destination. Avoid sudden braking or acceleration, and be especially 
cautious on hills or when making turns. Make sure your car is 
winterized and in good working order.

&&

$$

MTZ002-042015-
/O.NEW.KMSO.WW.Y.0010.250204T0600Z-250205T0600Z/
/O.EXT.KMSO.WS.A.0002.250205T0600Z-250205T1800Z/
West Glacier Region-
115 PM MST Mon Feb 3 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 11 
PM MST TUESDAY...
...WINTER STORM WATCH NOW IN EFFECT FROM TUESDAY EVENING THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Winter Weather Advisory, snow and blowing snow 
  expected. Likelihood of minor to moderate impacts from around 1 to 
  3 inches of snow is 90 percent, and 3 to 6 inches of snow is 50 
  percent. For the Winter Storm Watch, heavy snow, and blowing snow 
  possible. Chance of moderate to major impacts from snow is at 
  least 50 percent. Total snow accumulations between 4 and 10 inches 
  possible.

* WHERE...Highway 83 Bigfork to Swan Lake, Bad Rock Canyon, Essex, 
  Polebridge, and Marias Pass.

* WHEN...For the Winter Weather Advisory, from 11 PM this evening to 
  11 PM MST Tuesday. For the Winter Storm Watch, from Tuesday 
  evening through Wednesday morning.

* IMPACTS...For MODERATE impacts from snow, expect disruptions to 
  normal activities. Hazardous traveling conditions. Use extra 
  caution while driving. Closures and disruptions to infrastructure 
  may occur. For MAJOR impacts from snow, 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 Tuesday 
  morning and evening commutes, especially over higher passes.

* ADDITIONAL DETAILS...Gusty easterly winds up to 30 mph will 
  produce areas of blowing and drifting snow. Dangerously cold wind 
  chills between 15 and 30 below zero.

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.

Monitor the latest forecasts for updates on this situation.

&&

$$

IDZ009-010-042015-
/O.CON.KMSO.WW.Y.0008.000000T0000Z-250205T1800Z/
Western Lemhi County-Eastern Lemhi County-
115 PM MST Mon Feb 3 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Snow. Likelihood of developing or ongoing minor to moderate 
  impacts from around 1 to 3 inches of snow is 80 percent, and 3 to 
  6 inches of snow is 40 percent. Winds gusting as high as 40 mph. 
  Mountains and mountain passes will see higher amounts of up to 18 
  inches. For lower elevations, including Salmon, precipitation may 
  change over to freezing rain for a period of time Tuesday, making 
  for icy conditions.

* WHERE...Highway 28 Tendoy to Lone Pine, Williams Creek Summit, 
  Highway 93 Lost Trail Pass to Gibbonsville, Bannock Pass, Salmon, 
  Shoup, and Lemhi Pass.

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...For MINOR impacts from snow, expect a few inconveniences 
  to normal activities. Use caution while driving. For MODERATE 
  impacts from snow, 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.

&&

$$

006 
WWUS45 KMSO 042048
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
148 PM MST Tue Feb 4 2025

MTZ001-051500-
/O.UPG.KMSO.WS.A.0002.250205T0000Z-250205T1800Z/
/O.EXB.KMSO.WS.W.0003.250205T0100Z-250205T1500Z/
/O.EXT.KMSO.WW.Y.0010.000000T0000Z-250205T0100Z/
Kootenai/Cabinet Region-
148 PM MST Tue Feb 4 2025

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 PM MST THIS 
EVENING...
...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO 8 AM MST 
WEDNESDAY...

* WHAT...For the Winter Weather Advisory, snow. Likelihood of 
  moderate impacts from snow is 80 percent. Additional snow 
  accumulations up to two inches. For the Winter Storm Warning, 
  heavy snow, blowing and drifting snow expected. Likelihood of 
  major impacts from snow is up to 80 percent. Total snow 
  accumulations between 3 and 6 inches.

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

* WHEN...For the Winter Weather Advisory, until 6 PM MST this 
  evening. For the Winter Storm Warning, from 6 PM this evening to 8 
  AM MST Wednesday.

* IMPACTS...A band of moderate to heavy snow will overspread the 
  area this evening, and at the same time easterly winds will 
  increase in strength to 15 to 30 mph. The area between Happys Inn 
  and Marion has the highest impact of localized whiteout 
  conditions. Avoid travel in the impacted areas if possible. The 
  hazardous conditions could impact the Tuesday evening and 
  Wednesday morning commutes.

* ADDITIONAL DETAILS...Dangerously cold wind chills between 10 and 
  20 below zero are expected, especially along US-2 between Happys 
  Inn and Marion.

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.

&&

$$

MTZ002-051500-
/O.UPG.KMSO.WS.A.0002.250205T0600Z-250205T1800Z/
/O.EXB.KMSO.WS.W.0003.250205T0600Z-250205T1500Z/
/O.CON.KMSO.WW.Y.0010.000000T0000Z-250205T0600Z/
West Glacier Region-
148 PM MST Tue Feb 4 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MST THIS 
EVENING...
...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 8 AM 
MST WEDNESDAY...

* WHAT...For the Winter Weather Advisory, snow and blowing snow. 
  Likelihood of developing or ongoing moderate impacts from 1 to 3 
  inches of snow is 70 percent. Winds gusting as high as 35 mph. For 
  the Winter Storm Warning, heavy snow, blowing and drifting snow 
  expected. Likelihood of major impacts from snow is 80 percent. 
  Total snow accumulations between 4 and 8 inches, except up to 10 
  inches at both Swan Lake and Nyack. Winds gusting as high as 45 
  mph.

* WHERE...Polebridge, Bad Rock Canyon, Marias Pass, Highway 83 
  Bigfork to Swan Lake, and Essex.

* WHEN...For the Winter Weather Advisory, until 11 PM MST this 
  evening. For the Winter Storm Warning, from 11 PM this evening to 
  8 AM MST Wednesday.

* IMPACTS...Localized Blizzard conditions with visibility reduced to 
  one quarter mile at times is expected at Badrock Canyon, and 
  between Essex and Marias Pass. Whiteout conditions will make 
  travel treacherous and potentially life-threatening. Due to the 
  dangerous or impossible traveling conditions, avoid travel along 
  the US-2 corridor if possible tonight.

* ADDITIONAL DETAILS...Dangerously cold wind chills between 15 and 
  30 below zero.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

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.

&&

$$

MTZ043-051600-
/O.EXT.KMSO.WS.W.0003.000000T0000Z-250205T1600Z/
Potomac/Seeley Lake Region-
148 PM MST Tue Feb 4 2025

...WINTER STORM WARNING NOW IN EFFECT UNTIL 9 AM MST WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow. Likelihood of 
  ongoing major impacts from snow and blowing snow is up to 90 
  percent. Additional snow accumulations between 6 and 12 inches. 
  Winds gusting as high as 35 mph.

* WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to 
  Condon, and I-90 East Missoula to Bearmouth.

* WHEN...Until 9 AM MST Wednesday.

* IMPACTS...For MAJOR impacts from snow, 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 will impact travel through 
  Wednesday morning.

* ADDITIONAL DETAILS...Easterly winds of 15 to 30 mph are expected 
  in the channeled terrain.

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.

&&

$$

IDZ005-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Northern Clearwater Mountains-
1248 PM PST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST 
WEDNESDAY...

* WHAT...Heavy snow. Likelihood of developing or ongoing major to 
  extreme impacts from 6 to 10 inches or more of snow is 90 percent, 
  and 10 to 18 inches of snow is 60 percent. Additional snow 
  accumulations for lower elevations 4 to 8 inches, higher 
  elevations 8 to 12 inches, and mountain ridges and peaks 12 to 18 
  inches.

* WHERE...Highway 11 Pierce to Headquarters, Pierce, and Elk River.

* WHEN...Until 10 AM PST Wednesday.

* IMPACTS...Roads will likely be slick and hazardous. Whiteout 
  conditions are expected and will make travel treacherous and 
  potentially life-threatening. For MAJOR impacts from snow, 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 Tuesday evening and Wednesday morning commutes, especially 
  over higher passes.

* ADDITIONAL DETAILS...Westerly winds between 15 and 25 mph will 
  develop after midnight tonight and could bring isolated areas of 
  blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

IDZ006-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Southern Clearwater Mountains-
1248 PM PST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST 
WEDNESDAY...

* WHAT...Heavy snow. Likelihood of developing or ongoing major to 
  extreme impacts from 6 to 10 inches or more of snow is 100 
  percent, and 10 to 18 inches of snow is 70 percent.

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

* WHEN...Until 10 AM PST Wednesday.

* IMPACTS...Winter travel conditions. For MAJOR impacts from snow, 
  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 
  travel, especially US-12.

* ADDITIONAL DETAILS...Watch out for tree damage from heavy snow 
  along US-12 between Lolo Pass and Lowell. Snowfall rates of 1 to 2 
  inch per hour are likely through Tuesday night. Easterly winds of 
  10 to 20 mph are likely along US-12 until midnight. Westerly winds 
  between 10 and 20 mph will develop after midnight. There is a 15 
  percent chance for freezing rain at Elk City and points south.

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.

&&

$$

IDZ007-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Orofino/Grangeville Region-
1248 PM PST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST 
WEDNESDAY...

* WHAT...Heavy snow. Likelihood of developing or ongoing major 
  impacts from 6 to 10 inches or more of snow is 80 percent, and 10 
  to 18 inches of snow is 50 percent.

* WHERE...Camas Prairie, Grangeville and vicinity, and Greer Grade.

* WHEN...Until 10 AM PST Wednesday.

* IMPACTS...For MAJOR impacts from snow, 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 Tuesday 
  evening and Wednesday morning commutes, especially over higher 
  passes.

* ADDITIONAL DETAILS...Snow is expected to become heavier later this 
  afternoon and continue overnight. It could get very slick, 
  especially after dark. Snowfall rates could reach 0.5 inch to 1 
  inch per hour Tuesday evening through daybreak Wednesday. Gusty 
  west winds of 15 to 25 mph Wednesday morning could produce 
  localized blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel this evening and 
overnight. If travel is absolutely necessary, drive with extreme 
caution. Consider taking a winter storm kit along with you, 
including such items as tire chains, booster cables, flashlight, 
shovel, blankets and extra clothing. Also take water, a first aid 
kit, and anything else that would help you survive in case you 
become stranded.


&&

$$

IDZ008-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Lower Hells Canyon/Salmon River Region-
1248 PM PST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST 
WEDNESDAY...

* WHAT...Heavy snow expected. Likelihood of major impacts from 6 to 
  10 inches or more of snow is 80 percent, and 10 to 18 inches of 
  snow is 20 percent. Heaviest snowfall will occur in the higher 
  elevations. Additional snow accumulation in Riggins is 2 to 4 
  inches, and 1 to 2 inches in Hells Canyon.

* WHERE...White Bird Grade and Highway 95 Slate Creek to Riggins.

* WHEN...Until 10 AM PST Wednesday.

* IMPACTS...Roads, and especially bridges and overpasses, will 
  likely become slick and hazardous. For MAJOR impacts from snow, 
  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 Tuesday evening commute, especially over ridges.

* ADDITIONAL DETAILS...Snow is expected to become heavier later this 
  afternoon and continue overnight. It could get very slick, 
  especially after dark. Snowfall rates could reach 0.5 inch to 1 
  inch per hour Tuesday evening through daybreak Wednesday. There is 
  a 20 percent chance that freezing rain could occur this evening 
  from Whitebird south to Riggins.

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.

Persons should delay all travel if possible. If travel is absolutely 
necessary, drive with extreme caution and be prepared for sudden 
changes in visibility. Leave plenty of room between you and the 
motorist ahead of you, and allow extra time to reach your 
destination. Avoid sudden braking or acceleration, and be especially 
cautious on hills or when making turns. Make sure your car is 
winterized and in good working order.

&&

$$

MTZ003-051600-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1600Z/
Flathead/Mission Valleys-
148 PM MST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MST WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow expected. Additional 
  snow accumulations between 4 and 8 inches in the Flathead Valley, 
  5 to 10 inches Flathead Lake, Mission Valley, and 8 to 14 inches 
  in Arlee.

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

* WHEN...Until 9 AM MST Wednesday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Whiteout conditions are expected and will make 
  travel treacherous and potentially life-threatening. Winter 
  traveling conditions. For MAJOR impacts from snow, 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 will impact the 
  evening and morning commutes.

* ADDITIONAL DETAILS...Snow intensities will increase by Tuesday 
  evening. The north to east winds will increase in strength late 
  evening into the overnight. Steady winds of 15 to 25 mph with 
  gusts to 35 mph are expected in the vicinity of Flathead Lake and 
  Highway 28 from Elmo to Hot Springs, and will produce periods of 
  blowing and drifting snow. Badrock Canyon and Columbia Falls may 
  experience the worst wind, with wind gusts approaching 45 mph at 
  times, along with whiteout conditions. Dangerously cold wind chill 
  temperatures will range from 10 to 30 below zero.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

MTZ004-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Lower Clark Fork Region-
148 PM MST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow expected. Likelihood 
  of major impacts from snow is up to 80 percent. Additional snow 
  accumulations between 6 and 10 inches, except 10 to 16 inches 
  along Interstate 90 from Lookout Pass to Alberton, Noxon to 
  Thompson Falls and Evaro Hill.

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

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Whiteout conditions are expected and will make 
  travel treacherous and potentially life-threatening. For MAJOR 
  impacts from snow, 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 Tuesday evening and Wednesday morning commutes, 
  especially over higher passes.

* ADDITIONAL DETAILS...Heavy snow rates of 1 to 2 inch per hour will 
  redevelop by Tuesday evening and continue overnight. The blowing 
  and drifting will be the worst along I-90 east of Superior, 
  Highway 135 between St. Regis and Paradise and Highway 200 just 
  east of Thompson Falls. North to east winds of 10 to 25 mph are 
  expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

MTZ005-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Missoula/Bitterroot Valleys-
148 PM MST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow expected. Additional 
  snowfall will range from 3 to 8 inches.

* WHERE...Missoula and Bitterroot Valley.

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...For MAJOR impacts from snow, expect considerable 
  disruptions to normal activities. Dangerous traveling conditions. 
  Avoid travel in the impacted areas if possible. Widespread 
  closures and disruptions to infrastructure may occur after dark. 
  The hazardous conditions could impact travel, especially during 
  the Tuesday evening commute.

* ADDITIONAL DETAILS...North to east winds of 10 to 20 mph are 
  expected. Gusts to 25 mph are possible near Hellgate Canyon. There 
  is a 15 percent chance that freezing rain could occur in the 
  southern Bitterroot Valley Tuesday night.

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.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

MTZ006-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Bitterroot/Sapphire Mountains-
148 PM MST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Heavy snow. Likelihood of ongoing major impacts from snow 
  is 90 percent. Additional snow accumulations between 6 and 12 
  inches, except 12 to 18 inches at Lolo Pass. Winds gusting as high 
  as 35 mph.

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

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...Roads, and especially bridges and overpasses, will 
  likely become slick and hazardous. Visibilities may drop below 1/4 
  mile due to falling and blowing snow. Whiteout conditions are 
  expected and will make travel treacherous and potentially 
  life-threatening. Winter traveling conditions. For MAJOR impacts 
  from snow, 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 Tuesday evening and Wednesday morning commutes, especially 
  over higher passes.

* ADDITIONAL DETAILS...Westerly winds between 15 and 30 mph will 
  develop Wednesday morning and could produce localized blowing and 
  drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The latest road conditions for the state you are calling from can be 
obtained by calling 5 1 1.

Persons should consider delaying all travel. If travel is absolutely 
necessary, drive with extreme caution. Consider taking a winter 
storm kit along with you, including such items as tire chains, 
booster cables, flashlight, shovel, blankets and extra clothing. 
Also take water, a first aid kit, and anything else that would help 
you survive in case you become stranded.

&&

$$

MTZ007-051800-
/O.CON.KMSO.WS.W.0003.000000T0000Z-250205T1800Z/
Butte/Blackfoot Region-
148 PM MST Tue Feb 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Heavy snow, blowing and drifting snow. Likelihood of 
  developing or ongoing major impacts from snow is up to 80 percent. 
  Additional snow accumulations include: 1 to 3 inches Butte to Deer 
  Lodge, 3 to 6 inches Georgetown Lake and MacDonald Pass, and 4 to 
  8 inches Avon to Ovando.

* WHERE...Butte, MacDonald Pass, Homestake Pass, Georgetown Lake, 
  and Highway 12 Garrison to Elliston.

* WHEN...Until 11 AM MST Wednesday.

* IMPACTS...Winter traveling conditions. For MAJOR impacts from 
  snow, 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 Tuesday evening and Wednesday morning commutes, especially 
  over higher passes. Gusty winds could bring down tree branches.

* ADDITIONAL DETAILS...Blowing and drifting snow, caused by easterly 
  winds between 25 and 40 mph, will be expected from Elliston to 
  Garrison Junction, and Avon to Helmville to Clearwater Junction. 
  Gusty southwest winds between 15 and 35 mph will develop at 
  Georgetown Lake overnight. A burst of heavy snow showers are 
  expected Wednesday morning. Dangerously cold wind chills between 
  15 and 30 below zero are expected along and west of the Divide.

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.

&&

$$

IDZ009-010-051800-
/O.CON.KMSO.WW.Y.0008.000000T0000Z-250205T1800Z/
Western Lemhi County-Eastern Lemhi County-
148 PM MST Tue Feb 4 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST 
WEDNESDAY...

* WHAT...Mixed precipitation. Likelihood of developing or ongoing 
  minor impacts from snow is up to 60 percent. Light glaze expected. 
  Additional snow accumulations up to two inches, except 5 to 10 
  inches at Lost Trail Pass, and 3 to 6 inches at Williams Creek 
  Summit. Winds gusting as high as 35 mph tonight.

* WHERE...Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass 
  to Gibbonsville, Lemhi Pass, Williams Creek Summit, Bannock Pass, 
  Shoup, and Salmon.

* WHEN...Until 11 AM MST Wednesday.

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

* ADDITIONAL DETAILS...With mild temperatures this afternoon, expect 
  black ice formation after dark. A cold front passage by daybreak 
  Wednesday will bring periodic snow showers.

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.

&&

$$

Area Forecast Discussion
National Weather Service Missoula MT
343 AM MST Sun Feb 2 2025

.DISCUSSION...

KEY MESSAGES:

- Sunday-Monday: Arctic airmass will move west of the Continental
  Divide, bringing colder temperatures and snow

- Mid day Monday through Wednesday: Arctic overrunning event
  producing widespread moderate to heavy snow and wind, especially
  along and south of Interstate 90

Satellite and surface observations clearly demonstrate the two
main ingredients of our coming forecast. Satellite shows a long
plume of subtropical moisture stretching almost to Hawaii. Surface
observations show the Arctic front just arrived to Calgary
Canada, at 3am. Over the next 4 days these two features will
collide to produce a long duration impactful winter weather
event. These are some of the questions remaining: Where does the
Arctic boundary stall when the best moisture moves over the
Northern Rockies. Is the Arctic air mass relatively shallow,
meaning just at or below our highest mountains? Does a TROWAL that
models are predicting develop and where does it develop?

The first two questions have been consistently answered run after
run within the models. The Arctic boundary will stall somewhere
between the I-90 corridor and the southern Bitterroot Valley. This
is very reasonable as a strong southwest jet stream from 10k to
18k feet will not allow the cold dense air to flow south over
Lost Trail Pass. The jet also explains how shallow the Arctic air
mass will be, it is unlikely that the Arctic will be able to
compete against the Jet Stream winds. The last question about the
TROWAL is more difficult. First what is a TROWAL? It is an area of
enhanced lift in the atmosphere producing heavy precipitation,
typically northwest of the low pressure system. Currently, the
models demonstrate this area over the central Bitterroot Valley
and east of Missoula over I-90, MT-200, and US-12 areas. Just a
small movement north or south, east or west with the low and the
effects of the TROWAL will greatly change current snowfall
forecasts.

This afternoon the Arctic will blast into the Glacier region.
Locations such as Fielding and Essex may only warm into the low
teens this morning before rapidly dropping to near zero around
sunset. Additionally, northeast winds gusting to 35 mph will
combine with a quick burst of snow to produce difficult driving
conditions. Early evening, the Arctic will make its presence known
in the Flathead Valley. Here temperatures that warm into the
upper 20s will quickly cool to the single digits. Combine that
with a quick inch or two of snow and northeast winds 35 mph, will
cause travel headaches.

The Camas Prairie ID, southern Bitterroot Valley, Clearwater
Mountains, and Lemhi County ID, will have light snow today. One to
three inches on the Prairie and valleys, and 3 to 6 inches in the
mountains, is reasonable.

The Arctic will begin to affect west-central MT early morning
Monday. As the morning progresses, east winds 20 to 30 mph and
rapidly falling temperatures will move west towards Missoula
Valley and likely stall. It is not until late Monday that moisture
increases, by evening anywhere from Alberton eastward along I-90 will
receive periods of light to moderate snow and gusty winds
combining for potential whiteout conditions. Overnight Monday the
Arctic will filter south through the Bitterroot Valley, enhancing
snowfall rates.

Tuesday, the main plume of moisture arrives not diminishing until
Wednesday morning. The Arctic also moves into the Camas Prairie
ID, during the day. Prolonged northerly flow has modeled snow
amounts from 5 to 10 inches as the terrain rises around
Grangeville. The benches around US-95 have amounts from 4 to 8
inches. While locations like Pierce, Elk City, and Dixie receiving
4 to 11 inches.

Lemhi County will be discussed separately as the Arctic will
likely not make it here until after the precipitation ends. Light
snow in valleys and moderate to heavy snow in the mountains will
continue from mid-morning today through Monday. With the warm
front stationary around Lost Trail Pass, warm air will work in
during Monday allowing for mixed precipitation in lower valleys.
It has been very cold for the past 10 days, sub surface
temperatures will likely support rain freezing on contact in the
valleys. Decisions on winter weather highlights have yet to be
decided as this location has the biggest question marks. The 25th
to 75th percentile snow probability in the mountains is 9 to 14
inches over Williams Creek and 1 to 2 feet in the Beaverhead
Mountains.

This active pattern may continue in north-central ID through the
weekend, while western MT may only have Thursday to clean up
before the next system arrives late that evening.

&&

.AVIATION...The approaching Arctic front has slowed and will
begin to affect the region mid day Sunday into Monday. Northeast
winds will increase after 02/2300z gusting to 35kts, at KGPI.
Through 03/1200z, there is less confidence Arctic winds will begin
to affect other terminals that we produce TAFs for. Medium
Confidence exists for a prolonged heavy snow event affecting KMSO,
KHRF, KBTM, and KGIC, Monday through Wednesday.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Winter Storm Watch from Monday morning through Wednesday morning
     for Bitterroot/Sapphire Mountains...Butte/Blackfoot
     Region...Lower Clark Fork Region...Missoula/Bitterroot
     Valleys...Potomac/Seeley Lake Region.

     Winter Weather Advisory from 11 AM this morning to 11 AM MST
     Monday for Bitterroot/Sapphire Mountains...Butte/Blackfoot
     Region.

     Winter Storm Watch from late Monday night through Wednesday
     morning for Flathead/Mission Valleys...Kootenai/Cabinet
     Region...West Glacier Region.

     Winter Weather Advisory from 11 AM this morning to 8 AM MST
     Monday for West Glacier Region.

     Winter Weather Advisory from 5 PM this afternoon to 11 AM MST
     Monday for Flathead/Mission Valleys.

ID...Winter Storm Watch from Monday morning through Wednesday morning
     for Northern Clearwater Mountains...Southern Clearwater
     Mountains.

     Winter Weather Advisory from 11 AM MST /10 AM PST/ this morning
     to 11 AM MST /10 AM PST/ Monday for Eastern Lemhi County...
     Southern Clearwater Mountains...Western Lemhi County.

&&