Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Avalanche Warning
Area(s): Absaroka/Beartooth Mountains
Effective: 2025-12-09 @ 6:57 am
Onset: 2025-12-09 @ 6:57 am -> 2025-12-10 @ 6:00 am
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Billings MT on 2025-12-09 @ 6:57 am
Headline: Avalanche Warning issued December 9 at 5:57AM MST by NWS Billings MT
Description: AVWBYZ

The following message is transmitted at the request of the
Gallatin National Forest Avalanche Center.

The Gallatin NF Avalanche Center in Bozeman has issued a
BACKCOUNTRY AVALANCHE WARNING for the following areas:
NWS Billings MT - MTZ067 (MTZ067)

* WHAT...The avalanche danger is HIGH and avalanches will happen
today.

* WHERE...The mountains near Cooke City

* WHEN...In effect from Tue 04:39 MST to Wed 04:39 MST.

* IMPACTS...Avalanches have been happening for the last 4 days.
More snow and especially high winds will cause many more
avalanches today.

* PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche
conditions. Stay far away from any steep slope. Avalanches may
be triggered from flat terrain below steeper slopes.

Consult http://www.mtavalanche.com or www.avalanche.org for more
detailed information.

Similar avalanche danger may exist at locations outside the
coverage area of this or any avalanche center.

Alert: Avalanche Warning
Area(s): Kootenai/Cabinet Region; West Glacier Region
Effective: 2025-12-09 @ 6:34 am
Onset: 2025-12-09 @ 6:34 am -> 2025-12-10 @ 6:00 am
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Missoula MT on 2025-12-09 @ 6:34 am
Headline: Avalanche Warning issued December 9 at 5:34AM MST by NWS Missoula MT
Description: AVWMSO

The following message is transmitted at the request of Flathead Avalanche
Center Hungry Horse MT.

...AVALANCHE WARNING ISSUED BY THE FLATHEAD AVALANCHE CENTER...

06:00 MST Tue Dec 09 2025
The Flathead Avalanche Center in Hungry Horse has issued a BACKCOUNTRY
AVALANCHE WARNING for the following areas:

NWS Missoula MT -
MTZ001 (MTZ001)...MTZ002 (MTZ002)

* WHAT...Heavy rain, heavy snowfall, strong winds, and above-freezing
temperatures have created very dangerous avalanche conditions.

* WHERE...The Whitefish, Swan, and Flathead Ranges, as well as the Apgar
Mountains, Lake McDonald Valley, and Marias Pass areas of Glacier National
Park.

* WHEN...In effect from Tue 06:00 MST to Wed 05:00 MST.

* IMPACTS...Large to very large natural avalanches are likely on mid- and
upper-elevation slopes; they may involve wet snow or dense slabs of new and
wind-drifted snow. These slides can run into low elevation terrain and
valley bottoms, including terrain where it doesn't appear to be enough snow
cover for avalanche hazards.

* PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche
conditions. Travel in and below avalanche terrain is not recommended.
Avalanches may run long distances and can run into mature forests, valley
floors, or flat terrain.

Consult http://www.flatheadavalanche.org/ or www.avalanche.org for more
detailed information.

Similar avalanche danger may exist at locations outside the coverage area of
this or any avalanche center.

Alert: Winter Weather Advisory
Area(s): East Glacier Park Region; Southern Rocky Mountain Front
Effective: 2025-12-09 @ 4:20 am -> 2025-12-10 @ 12:00 pm
Onset: 2025-12-10 @ 1:00 am -> 2025-12-09 @ 6:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2025-12-09 @ 4:20 am
Headline: Winter Weather Advisory issued December 9 at 3:20AM MST until December 10 at 11:00AM MST by NWS Great Falls MT
Description: * WHAT...Snow expected. Total snow accumulations 2 to 4 inches on
Marias Pass, and up to 7 inches at ridge tops.

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

* WHEN...From midnight tonight to 11 AM MST Wednesday.

* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.

* ADDITIONAL DETAILS...Snowfall rates near 1 inch per hour will be
possible between 4 AM and 7 AM Wednesday.

Alert: High Wind Warning
Area(s): East Glacier Park Region; Eastern Toole and Liberty; Southern Rocky Mountain Front; Eastern Pondera and Eastern Teton; Cascade County below 5000ft; Upper Blackfoot and MacDonald Pass; Gates of the Mountains
Effective: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 11:00 am
Onset: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 11:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2025-12-09 @ 4:17 am
Headline: High Wind Warning issued December 9 at 3:17AM MST until December 9 at 10:00AM MST by NWS Great Falls MT
Description: * WHAT...West winds 30 to 40 mph with gusts up to 80 mph.

* WHERE...The Continental Divide along the Rocky Mountain Front,
Eastern Toole and Liberty Counties, Eastern Pondera and Eastern
Teton Counties, Cascade County below 5000ft, Upper Blackfoot and
MacDonald Pass, and Gates of the Mountains.

* WHEN...Until 10 AM MST this morning.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles.

Alert: High Wind Warning
Area(s): Madison River Valley
Effective: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 11:00 am
Onset: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 11:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2025-12-09 @ 4:17 am
Headline: High Wind Warning issued December 9 at 3:17AM MST until December 9 at 10:00AM MST by NWS Great Falls MT
Description: * WHAT...South winds 30 to 40 mph with gusts up to 70 mph.

* WHERE...Madison River Valley...including Norris Hill on Highway
287.

* WHEN...Until 10 AM MST this morning.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles.

Alert: High Wind Warning
Area(s): Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Southern High Plains
Effective: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 11:00 am
Onset: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 6:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2025-12-09 @ 4:17 am
Headline: High Wind Warning issued December 9 at 3:17AM MST until December 9 at 10:00AM MST by NWS Great Falls MT
Description: * WHAT...For the High Wind Warning, west winds 30 to 40 mph with
gusts up to 75 mph. For the High Wind Watch, west winds 30 to 40
mph with gusts up to 60 mph possible.

* WHERE...The foothills and plains adjacent to the Rocky Mountain
Front, and Eastern Glacier, Western Toole, and Central Pondera
Counties.

* WHEN...For the High Wind Warning, until 10 AM MST this morning.
For the High Wind Watch, from Wednesday morning through Wednesday
afternoon.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles.

Alert: High Wind Watch
Area(s): Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Southern High Plains
Effective: 2025-12-09 @ 4:17 am -> 2025-12-10 @ 6:00 pm
Onset: 2025-12-10 @ 9:00 am -> 2025-12-09 @ 6:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2025-12-09 @ 4:17 am
Headline: High Wind Watch issued December 9 at 3:17AM MST until December 10 at 5:00PM MST by NWS Great Falls MT
Description: * WHAT...For the High Wind Warning, west winds 30 to 40 mph with
gusts up to 75 mph. For the High Wind Watch, west winds 30 to 40
mph with gusts up to 60 mph possible.

* WHERE...The foothills and plains adjacent to the Rocky Mountain
Front, and Eastern Glacier, Western Toole, and Central Pondera
Counties.

* WHEN...For the High Wind Warning, until 10 AM MST this morning.
For the High Wind Watch, from Wednesday morning through Wednesday
afternoon.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles.

Alert: High Wind Warning
Area(s): Hill County; Northern Blaine County; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Judith Basin County and Judith Gap; Fergus County below 4500ft; Little Belt and Highwood Mountains; Snowy and Judith Mountains; Big Belt, Bridger and Castle Mountains; Meagher County Valleys
Effective: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 4:00 pm
Onset: 2025-12-09 @ 4:17 am -> 2025-12-09 @ 4:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2025-12-09 @ 4:17 am
Headline: High Wind Warning issued December 9 at 3:17AM MST until December 9 at 3:00PM MST by NWS Great Falls MT
Description: * WHAT...West winds 30 to 40 mph with gusts up to 70 mph.

* WHERE...Bears Paw, Highwood, Little Belt, and Snowy Mountains,
Hill County, Northern Blaine County, Western and Central Chouteau
County, Judith Basin County and Judith Gap, Fergus County below
4500ft, Big Belt, Bridger and Castle Mountains, and Meagher County
Valleys.

* WHEN...Until 3 PM MST this afternoon.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles.

Alert: High Wind Warning
Area(s): Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt
Effective: 2025-12-09 @ 3:42 am -> 2025-12-09 @ 6:00 pm
Onset: 2025-12-09 @ 3:42 am -> 2025-12-09 @ 6:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2025-12-09 @ 3:42 am
Headline: High Wind Warning issued December 9 at 2:42AM MST until December 9 at 5:00PM MST by NWS Glasgow MT
Description: * WHAT...West winds 30 to 40 mph with gusts up to 60 mph.

* WHERE...All of northeast Montana.

* WHEN...Until 5 PM MST this afternoon.

* IMPACTS...High winds may move loose debris, damage property, and
cause power bumps. Travel could be difficult, especially for high
profile vehicles.

* ADDITIONAL DETAILS...Freezing rain this morning will create icy
roads in some areas.

Alert: Winter Weather Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt
Effective: 2025-12-09 @ 3:39 am -> 2025-12-09 @ 3:00 pm
Onset: 2025-12-09 @ 3:39 am -> 2025-12-09 @ 3:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2025-12-09 @ 3:39 am
Headline: Winter Weather Advisory issued December 9 at 2:39AM MST until December 9 at 2:00PM MST by NWS Glasgow MT
Description: * WHAT...Freezing rain. Additional ice accumulations around a light
glaze. West winds gusting as high as 60 mph.

* WHERE...All of northeast Montana.

* WHEN...Until 2 PM MST this afternoon.

* IMPACTS...Very slippery sidewalks, roads and bridges are possible.
The hazardous conditions could impact the Tuesday morning commute.
Strong winds could cause tree damage.

Alert: Winter Storm Warning
Area(s): Absaroka/Beartooth Mountains
Effective: 2025-12-09 @ 2:32 am -> 2025-12-10 @ 6:00 pm
Onset: 2025-12-09 @ 2:32 am -> 2025-12-10 @ 2:45 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2025-12-09 @ 2:32 am
Headline: Winter Storm Warning issued December 9 at 1:32AM MST until December 10 at 5:00PM MST by NWS Billings MT
Description: * WHAT...Periods of heavy snow. Additional snow accumulations of 10
to 18 inches, greatest on west aspects. Winds gusting as high as 75
mph.

* WHERE...Absaroka/Beartooth Mountains.

* WHEN...Until 5 PM MST Wednesday.

* IMPACTS...Recreation in the high country will be impacted by heavy
accumulating snow and significant blowing snow. Whiteout conditions
are possible over the highest elevations. Avalanche danger will
increase.

* ADDITIONAL DETAILS...Additional periods of moderate to heavy snow
possible Thursday and Friday.

Alert: High Wind Warning
Area(s): Livingston Area; Beartooth Foothills
Effective: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 12:00 pm
Onset: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 12:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2025-12-09 @ 2:25 am
Headline: High Wind Warning issued December 9 at 1:25AM MST until December 9 at 11:00AM MST by NWS Billings MT
Description: * WHAT...Southwest winds gusting 70 to 80 mph.

* WHERE...Beartooth Foothills and Livingston Area.

* WHEN...Until 11 AM MST this morning.

* IMPACTS...Strong crosswinds will make travel hazardous along
Interstate 90 from Livingston to Big Timber and roads along the
Beartooth Foothills. Gusty winds will blow around unsecured
objects.

* ADDITIONAL DETAILS...Strongest wind gusts are expected to occur
through early this morning.

Alert: High Wind Warning
Area(s): Absaroka/Beartooth Mountains; Crazy Mountains
Effective: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 12:00 pm
Onset: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 12:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2025-12-09 @ 2:25 am
Headline: High Wind Warning issued December 9 at 1:25AM MST until December 9 at 11:00AM MST by NWS Billings MT
Description: * WHAT...West winds gusting to 80 mph.

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

* WHEN...Until 11 AM MST this morning.

* IMPACTS...Outdoor recreation will be impacted by very strong wind
gusts and areas of blowing snow.

* ADDITIONAL DETAILS...Increased avalanche danger is possible.
Strongest gusts are expected early this morning.

Alert: High Wind Warning
Area(s): Red Lodge Foothills; Southeastern Carbon
Effective: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 6:00 pm
Onset: 2025-12-09 @ 9:00 am -> 2025-12-09 @ 6:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2025-12-09 @ 2:25 am
Headline: High Wind Warning issued December 9 at 1:25AM MST until December 9 at 5:00PM MST by NWS Billings MT
Description: * WHAT...Northwest winds gusting 50 to 60 mph expected.

* WHERE...Red Lodge Foothills and Southeastern Carbon.

* WHEN...From 8 AM this morning to 5 PM MST this afternoon.

* IMPACTS...Travel will be difficult, especially for high profile
vehicles. This includes Highways 212 and 310.

* ADDITIONAL DETAILS...Strongest winds are expected to occur in the
late morning and afternoon.

Alert: High Wind Warning
Area(s): Judith Gap; Northern Sweet Grass; Melville Foothills; Southern Wheatland
Effective: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 6:00 pm
Onset: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 6:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2025-12-09 @ 2:25 am
Headline: High Wind Warning issued December 9 at 1:25AM MST until December 9 at 5:00PM MST by NWS Billings MT
Description: * WHAT...West winds gusting to 70 mph expected.

* WHERE...Judith Gap, Southern Wheatland, Melville Foothills, and
Northern Sweet Grass.

* WHEN...Until 5 PM MST this afternoon.

* IMPACTS...Strong crosswinds will make travel difficult along
Highway 191 from Big Timber through Judith Gap. Secure loose
outdoor objects.

* ADDITIONAL DETAILS...Strongest winds will be this morning and early
afternoon.

Alert: High Wind Warning
Area(s): Northern Stillwater; Golden Valley
Effective: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 6:00 pm
Onset: 2025-12-09 @ 6:00 am -> 2025-12-09 @ 6:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2025-12-09 @ 2:25 am
Headline: High Wind Warning issued December 9 at 1:25AM MST until December 9 at 5:00PM MST by NWS Billings MT
Description: * WHAT...West winds gusting to 65 mph expected.

* WHERE...Golden Valley and Northern Stillwater.

* WHEN...From 5 AM early this morning to 5 PM MST this afternoon.

* IMPACTS...Travel will be difficult, especially for high profile
vehicles. Secure loose outdoor objects.

* ADDITIONAL DETAILS...Strongest winds will be in the morning and
early afternoon.

Alert: High Wind Warning
Area(s): Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Powder River; Carter; Northern Big Horn; Southern Rosebud; Southern Big Horn; Bighorn Canyon; Northern Carbon; Northeastern Yellowstone; Southwestern Yellowstone; Sheridan Foothills
Effective: 2025-12-09 @ 2:25 am -> 2025-12-09 @ 6:00 pm
Onset: 2025-12-09 @ 6:00 am -> 2025-12-09 @ 6:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2025-12-09 @ 2:25 am
Headline: High Wind Warning issued December 9 at 1:25AM MST until December 9 at 5:00PM MST by NWS Billings MT
Description: * WHAT...West winds gusting up to 60 mph expected.

* WHERE...Portions of central, south central, and southeast Montana
and north central Wyoming.

* WHEN...From 5 AM early this morning to 5 PM MST this afternoon.

* IMPACTS...Travel across the region will be difficult, especially
for high profile vehicles. Outdoor activities will be impacted by
strong wind gusts. Secure loose outdoor objects.

* ADDITIONAL DETAILS...Strongest winds will be late this morning
through mid afternoon.

Alert: Winter Weather Advisory
Area(s): West Glacier Region; Potomac/Seeley Lake Region
Effective: 2025-12-09 @ 1:42 am -> 2025-12-10 @ 12:00 pm
Onset: 2025-12-10 @ 1:00 am -> 2025-12-10 @ 12:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2025-12-09 @ 1:42 am
Headline: Winter Weather Advisory issued December 9 at 12:42AM MST until December 10 at 11:00AM MST by NWS Missoula MT
Description: * WHAT...Snow expected. There is a likelihood of moderate winter
weather impacts. Total snow accumulations of 2 to 5 inches.

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

* WHEN...From midnight tonight to 11 AM MST Wednesday.

* IMPACTS...For MODERATE winter weather impacts, expect disruptions
to normal activities. Difficult traveling conditions. Use extra
caution while driving. The difficult conditions could impact the
Wednesday morning commute, especially over higher passes.

* ADDITIONAL DETAILS...Snowfall rates of 1 inch per hour will be
possible between 4am and 7am

Alert: Avalanche Warning
Area(s): Flathead, MT; Lincoln, MT
Effective: 2025-12-08 @ 7:01 pm
Onset: 2025-12-08 @ 7:01 pm -> 2025-12-09 @ 7:15 pm
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Missoula MT on 2025-12-08 @ 7:01 pm
Headline: Avalanche Warning issued December 8 at 6:01PM MST by NWS Missoula MT
Description: AVWMSO

The following message is transmitted at the request of Idaho Panhandle
Avalanche Center Sandpoint ID.

...AVALANCHE WARNING ISSUED BY THE IDAHO PANHANDLE AVALANCHE CENTER...

16:00 PST Mon Dec 08 2025 The Idaho Panhandle Avalanche Center in Sandpoint
has issued a BACKCOUNTRY AVALANCHE WARNING for the following areas:

NWS Missoula MT -
MTZ001 (MTZ001)

NWS Spokane WA -
ID 017 (Bonner County)...ID 021 (Boundary County)

* WHAT...An Avalanche Warning is in effect from Monday 4 PM to Tuesday 4
PM. Very dangerous avalanche conditions will develop overnight and last
though Tuesday as heavy, wet snowfall transitions to heavy rain along with
strong winds. You can very easily trigger avalanches large enough to bury
or kill you, and some will release spontaneously. Avoid travel in avalanche
terrain during this period.

* WHERE...The Selkirk Mountains, West and East Cabinet Mountains, and the
Silver Valley-Bitterroot Mountains above 4,000 feet.

* WHEN...In effect from Mon 16:00 PST to Tue 16:00 PST.

* IMPACTS...A potent atmospheric river characterized by near-historic
moisture will introduce a firehose of moisture into North Idaho and
Northwestern Montana. The rain line will rise to around 7,000 to 7,500 feet
overnight Monday and will saturate recent snowfall and overload pre-
existing weak snow layers. It will be very likely for backcountry travelers
to trigger avalanches and natural avalanches are likely. Avalanches can
break wide across terrain features and run long distances to lower
elevations.

* PRECAUTIONARY / PREPAREDNESS ACTIONS...Travel in avalanche terrain is not
recommended during this period.

Consult http://www.idahopanhandleavalanche.org/ or www.avalanche.org for
more detailed information.

Similar avalanche danger may exist at locations outside the coverage area
of this or any avalanche center.

Alert: Avalanche Warning
Area(s): Flathead, MT; Lincoln, MT
Effective: 2025-12-08 @ 6:54 pm
Onset: 2025-12-08 @ 6:54 pm -> 2025-12-09 @ 7:00 pm
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Missoula MT on 2025-12-08 @ 6:54 pm
Headline: Avalanche Warning issued December 8 at 5:54PM MST by NWS Missoula MT
Description: AVWMSO

The following message is transmitted at the request of .

Alert: Avalanche Warning
Area(s): Flathead, MT; Lincoln, MT
Effective: 2025-12-08 @ 6:44 pm
Onset: 2025-12-08 @ 6:44 pm -> 2025-12-09 @ 6:45 pm
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Missoula MT on 2025-12-08 @ 6:44 pm
Headline: Avalanche Warning issued December 8 at 5:44PM MST by NWS Missoula MT
Description: AVWMSO

The following message is transmitted at the request of .

Alert: Hydrologic Outlook
Area(s): Granite, MT; Missoula, MT; Ravalli, MT
Effective: 2025-12-08 @ 2:22 pm
Onset: 2025-12-08 @ 2:22 pm -> 2025-12-10 @ 3:00 pm
Severity: Unknown
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2025-12-08 @ 2:22 pm
Headline: Hydrologic Outlook issued December 8 at 1:22PM MST by NWS Missoula MT
Description: ESFMSO

A prolonged atmospheric river is expected to bring periods of heavy
rain for western Montana Monday night through Thursday. Rising snow
levels will lead to a rain-on-snow event for elevations below 7,000
feet Monday night into Tuesday morning. Precipitation rates will
briefly decrease Tuesday afternoon before a second surge of moisture
arrives Tuesday night into Thursday. During the second surge, snow
levels will be lower initially, ranging from 3,500 to 5,000 feet
with some slushy snow accumulations across northwest Montana
valleys, but will then rise to 6,000 to 8,000 feet Wednesday into
Thursday. By Thursday, significant precipitation totals are
forecast, with 1 to 4 inches in the valleys and 5 to 8 inches in the
mountains, with locally higher totals over mountain crests.

Landslides in areas of steep terrain and minor flooding in urban and
poor-drainage areas are possible. Storm drains and ditches may
become clogged with debris. You may want to preemptively shovel snow
away from your homes. Watch basements for moisture intrusion.

Alert: Flood Watch
Area(s): Mineral, MT
Effective: 2025-12-08 @ 1:53 pm -> 2025-12-11 @ 6:00 pm
Onset: 2025-12-08 @ 6:00 pm -> 2025-12-09 @ 3:15 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2025-12-08 @ 1:53 pm
Headline: Flood Watch issued December 8 at 12:53PM MST until December 11 at 5:00PM MST by NWS Missoula MT
Description: Near-record precipitation is possible this week as two Atmospheric
Rivers will move through the region. The first one arrives today and
continues through Tuesday, followed by a second, stronger one
Tuesday night through Thursday. Between 4 and 10 inches of moderate
to heavy rain are expected in the mountains. For some locations,
near record rainfall amounts are possible. The rain, falling on the
current snowpack, combined with mild nighttime temperatures will
increase snowmelt. Flows in rivers may increase quickly and reach
critical levels.

* WHAT...Flooding caused by rain and snowmelt continues to be
possible.

* WHERE...A portion of west central Montana, including the following
county, Mineral.

* WHEN...From 5 PM MST this afternoon through Thursday afternoon.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas. Storm drains and
ditches may become clogged with debris. People, structures, and
roads located below steep slopes, in canyons, and near the mouths
of canyons may be at risk from landslides.

* ADDITIONAL DETAILS...
- A prolonged atmospheric river is expected to bring periods of
heavy rain to Mineral County, Monday night through Thursday.
Rising snow levels will lead to a rain on snow event for
elevations below 7,000 feet Monday night into Tuesday
morning. The precipitation rates will briefly decrease
Tuesday afternoon, before a second surge of moisture arrives
Tuesday night into Thursday morning with snow levels rising
to around 8,000 feet. By Thursday, significant precipitation
totals are forecast, with 1 to 5 inches in the valleys and 5
to 8 inches in the mountains, with locally higher totals over
mountain crests. Landslides in areas of steep terrain and
minor flooding in urban and poor drainage areas is possible.
- https://www.weather.gov/mso/hydrology

Alert: Flood Watch
Area(s): Flathead, MT; Lake, MT; Lincoln, MT; Sanders, MT
Effective: 2025-12-08 @ 1:53 pm -> 2025-12-11 @ 6:00 pm
Onset: 2025-12-08 @ 6:00 pm -> 2025-12-09 @ 3:15 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2025-12-08 @ 1:53 pm
Headline: Flood Watch issued December 8 at 12:53PM MST until December 11 at 5:00PM MST by NWS Missoula MT
Description: Near-record precipitation is possible this week as two Atmospheric
Rivers will move through the region. The first one arrives today and
continues through Tuesday, followed by a second, stronger one
Tuesday night through Thursday. Between 4 and 10 inches of moderate
to heavy rain are expected in the mountains. For some locations,
near record rainfall amounts are possible. The rain, falling on the
current snowpack, combined with mild nighttime temperatures will
increase snowmelt. Flows in rivers may increase quickly and reach
critical levels.

* WHAT...Flooding caused by rain and snowmelt continues to be
possible.

* WHERE...A portion of northwest Montana, including the following
counties, Flathead, Lake, Lincoln and Sanders.

* WHEN...From 5 PM MST this afternoon through Thursday afternoon.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas. Storm drains and
ditches may become clogged with debris. Rockfall is possible.

* ADDITIONAL DETAILS...
- A prolonged atmospheric river event will bring periods of
moderate to heavy rainfall to the region. Snow levels will
rise to 6,000 to 7,000 feet during the first moisture plume
on Tuesday. Snow levels will fall temporarily to 3,000 to
5,000 feet Tuesday night before rising again to 6,000 to
9,000 feet Wednesday and Thursday. Between 4 and 10 inches of
total precipitation will fall this week in the mountains and
upslope regions and between 1 and 4 inches of total rainfall
is expected in the valleys. Landslides in areas of steep
terrain and minor flooding in urban and poor drainage areas
are possible.
- https://www.weather.gov/mso/hydrology

Alert: Wind Advisory
Area(s): West Glacier Region
Effective: 2025-12-07 @ 1:38 pm -> 2025-12-09 @ 12:00 pm
Onset: 2025-12-09 @ 12:00 am -> 2025-12-09 @ 12:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2025-12-07 @ 1:38 pm
Headline: Wind Advisory issued December 7 at 12:38PM MST until December 9 at 11:00AM MST by NWS Missoula MT
Description: * WHAT...Southwest winds 25 to 35 mph with gusts up to 50 mph
expected. Gusts over 50 mph on the higher terrain.

* WHERE...West Glacier Region.

* WHEN...From 11 PM Monday to 11 AM MST Tuesday.

* IMPACTS...Gusty winds will blow around unsecured objects. Weakened
trees and tree limbs could be blown down impacting road access and
causing localized power outages.

* ADDITIONAL DETAILS...Snow and poor visibility is a concern at
Marias Pass Monday afternoon through Tuesday morning. Watch for
changeable conditions near the Pass.