Winter Storm Warning 9, NWS Missoula, MT

682 
WWUS45 KMSO 041838
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
1238 PM MDT Sat Oct 4 2025

MTZ002-051800-
/O.CON.KMSO.WS.W.0009.251005T0600Z-251005T1800Z/
West Glacier Region-
1238 PM MDT Sat Oct 4 2025

...WINTER STORM WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 
NOON MDT SUNDAY ABOVE 5500 FEET...

* WHAT...Heavy snow expected above 5500 feet. Major winter weather 
  impacts. Total snow accumulations of 4 to 8 inches expected. 15% 
  chance for 10 inches of snow for similar elevations of Logan Pass. 
  Higher amounts for elevations above 7000 feet. Cold, wet, and 
  windy conditions expected, with east northeast winds in excess of 
  30 mph will lead to concerns for hypothermia.

* WHERE...Glacier National Park higher elevations including 
  Going-to-the-Sun Road and Logan Pass.

* WHEN...From midnight tonight to noon MDT Sunday.

* 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.

* ADDITIONAL DETAILS...Consider delaying backcountry recreation.

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.

&&

$$

MTZ006-051800-
/O.EXB.KMSO.WW.Y.0036.251005T0900Z-251005T1800Z/
Bitterroot/Sapphire Mountains-
1238 PM MDT Sat Oct 4 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 3 AM TO NOON MDT SUNDAY...

* WHAT...Snow expected. There is a likelihood of minor to moderate 
  winter weather impacts. Total snow accumulations 1 to 5 inches, 
  with a 50 percent probability for 5 inches above 7000 feet.

* WHERE...Backcountry roads in the Bitterroot and Sapphire Ranges, 
  Skalkaho Pass, and Lost Trail Pass.

* WHEN...From 3 AM to noon MDT Sunday.

* IMPACTS...For MINOR winter weather impacts, expect a few 
  inconveniences to normal activities. Use caution while driving. 
  For MODERATE winter weather impacts, expect disruptions to normal 
  activities. Hazardous traveling conditions. Use extra caution 
  while driving.

* ADDITIONAL DETAILS...Pack additional supplies for cold, wet and 
  breezy conditions in the backcountry.

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.

&&

$$

MTZ007-051800-
/O.CON.KMSO.WW.Y.0036.251005T0600Z-251005T1800Z/
Butte/Blackfoot Region-
1238 PM MDT Sat Oct 4 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT 
TO NOON MDT SUNDAY ABOVE 5500 FEET...

* WHAT...Snow expected above 5500 feet. There is a likelihood of 
  minor to moderate winter weather impacts, for early season snow. 
  Total snow accumulations of 2 to 4 inches.

* WHERE...Georgetown Lake and backcountry roads. Impacts due to snow 
  are expected to be above pass levels.

* WHEN...From midnight tonight to noon MDT Sunday.

* IMPACTS...For MINOR winter weather impacts, expect a few 
  inconveniences to normal activities. Use caution while driving. 
  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.

* ADDITIONAL DETAILS...Pack additional supplies for cold, wet and 
  breezy conditions in the backcountry.

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.

&&

$$

MTZ043-051800-
/O.CON.KMSO.WW.Y.0036.251005T0600Z-251005T1800Z/
Potomac/Seeley Lake Region-
1238 PM MDT Sat Oct 4 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT 
TO NOON MDT SUNDAY ABOVE 5500 FEET...

* WHAT...Snow expected above 5500 feet. There is a likelihood of 
  minor to moderate winter weather impacts, for early season snow. 
  Total snow accumulations of 2 to 4 inches.

* WHERE...Potomac/Seeley Lake Region.

* WHEN...From midnight tonight to noon MDT Sunday.

* 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.

* ADDITIONAL DETAILS...Pack additional supplies for cold, wet and 
  breezy conditions in the backcountry.

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.

&&

$$

987 
WWUS45 KMSO 051345
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
745 AM MDT Sun Oct 5 2025

MTZ002-051445-
/O.CAN.KMSO.WS.W.0009.000000T0000Z-251005T1800Z/
West Glacier Region-
745 AM MDT Sun Oct 5 2025

...WINTER STORM WARNING IS CANCELLED...

The threat has ended.

$$

MTZ006-051800-
/O.CON.KMSO.WW.Y.0036.000000T0000Z-251005T1800Z/
Bitterroot/Sapphire Mountains-
745 AM MDT Sun Oct 5 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY...

* WHAT...Snow. There is a likelihood of developing or ongoing minor 
  to moderate winter weather impacts. Additional snow accumulations 
  up to one inch.

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

* WHEN...Until noon MDT today.

* 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. Winter traveling conditions.

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.

&&

$$

MTZ007-051800-
/O.CON.KMSO.WW.Y.0036.000000T0000Z-251005T1800Z/
Butte/Blackfoot Region-
745 AM MDT Sun Oct 5 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY 
ABOVE 5500 FEET...

* WHAT...Snow expected above 5500 feet. There is a likelihood of 
  minor to moderate winter weather impacts, for early season snow. 
  Total snow accumulations of 2 to 4 inches.

* WHERE...Homestake Pass, MacDonald Pass, and Georgetown Lake.

* WHEN...Until noon MDT today.

* IMPACTS...For MINOR winter weather impacts, expect a few 
  inconveniences to normal activities. Use caution while driving. 
  Winter traveling conditions.

* ADDITIONAL DETAILS...Pack additional supplies for cold, wet and 
  breezy conditions in the backcountry.

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.

&&

$$

MTZ043-051800-
/O.CON.KMSO.WW.Y.0036.000000T0000Z-251005T1800Z/
Potomac/Seeley Lake Region-
745 AM MDT Sun Oct 5 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY 
ABOVE 5500 FEET...

* WHAT...Snow expected above 5500 feet. There is a likelihood of 
  minor to moderate winter weather impacts, for early season snow. 
  Total snow accumulations of 2 to 4 inches.

* WHERE...Potomac/Seeley Lake Region.

* WHEN...Until noon MDT today.

* 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.

* ADDITIONAL DETAILS...Pack additional supplies for cold, wet and 
  breezy conditions in the backcountry.

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
411 AM MDT Fri Oct 3 2025

.DISCUSSION...

KEY MESSAGES:

-  Steady precipitation across north central Idaho into west
   central Montana this morning

-  Snow for the higher terrain Saturday into Sunday, especially
   around Glacier National Park.

-  Widespread frost/freeze for Monday and Tuesday mornings.

A wide band of light to moderate rain has developed across Idaho
county into west central Montana. As of 4am MDT, areas under the
rain band has pick up 0.1 to 0.45" of precipitation. This band of
precipitation will decrease in intensity throughout the day.

A secondary disturbance is still on track to slide southward out
of Canada Saturday into Sunday. This disturbance will bring cooler
air along with increase precipitation across western Montana. The
heaviest precipitation will be along the Continental Divide
especially around Glacier National Park. Snow levels appear to
drop to around 3500 feet around the Park by Sunday morning. The
latest model guidance is showing the potential of 3 to 8 inches of
snow accumulation in the higher terrain of Glacier. Logan pass has
around a 60% chance of receiving 6 inches of snow from this event
with Marias passes having a 50% chance of receiving 2 inches of
snow.

As the disturbance moves out of the area Sunday night into Monday
drier air will settle over the region. The clear skies and this
cold air mass will allow for the high potential of temperatures
to drop below freezing by Monday and Tuesday morning across the
region. The lower valleys of Idaho and Clearwater counties are
expected to remain above freezing, but still be quite low for this
time of year.

A ridge of high pressure builds over the region by the middle part
of next week allowing for a gradual warming trend.

&&

.AVIATION...A band of light to moderate rain will continue to
impact Idaho, Lemhi counties along with west central Montana. Low
ceilings and periods of reduced visibilities are expected under
this band. The precipitation will decrease in intensity and
coverage throughout the day as it slowly moves towards the east.
KMSO and KHRF will have the greatest impact from the
precipitation.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Winter Storm Watch from late Saturday night through Sunday
     morning for West Glacier Region.

ID...None.
&&