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Daily Winter Weather Report

Yellowstone National Park Winter Weather Links
Avalanche Advisory Special Weather Info
Daily Winter Weather Report Winter Road Report
Snow Depth Totals Yellowstone Weather Forecast

Date: Friday - 01 February 2013

Station Pres Temp Max Temp Min Temp New Snow Depth Sky Present Conditions
Bechler 26.0 27.0 26.0 0   OC WSW @ 3 - 7 mph
Canyon 26.8 26.8 25.2 .10 36 OC  
East Entrance 29.3 29.6 27.1 .08 20 OC  
Lake 24.1 25.0 21.9 .05 34 OC W @ 9 mph
Madison 25.3 26.8 22.5   18 OC  
Mammoth 30.4 30.9 28.9 .07 11 OC SSW @ 6 - 9 mph
NE Entrance 27.9 27.9 27.1 .20 26 OC  
Old Faithful 23.8 26.1 23.8 0 32 OC WSW @ 9 - 17 mph
Soda Butte 23.9 23.9 23.1 0   OC  
South Entrance 27.8 28.0 25.5 .16 42 OC  
Sylvan Lake 21.7 25.3 21.6 .20 52 OC  
Sylvan Road 28.2 28.2 26.2 .20 33 OC  
Thorofare 21.0 21.0 20.0 0   OC NW @ 11 - 21 mph
Thumb Divide 24.8 25.5 24.4 .20 44 OC  
Tower 23.1 24.5 22.7 .01   OC SSE @ 1 mph
West Entrance 28.4 28.4 28.2 .10 27 OC  
T=Trace/ BC=Broken Clouds/ C=Clear/ OC=Overcast/ SC=Scattered Clouds
All Temperatures are in °F ~ All Snow Depths are in Inches

* * Live Weather via All Yellowstone WebCams * *

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* * * Road Conditions * * *
Road Section Status Conditions Public Access / Info
Gardiner, MT to Mammoth Open * Snow Packed/Icy STR - Not Maintained from 4:30 PM to 6:00 AM
Mammoth to Tower Open * Snow Packed/Icy STR - Not Maintained from 4:30 PM to 6:00 AM
Tower to NE Entrance Open * Snow Packed/Icy STR - Not Maintained from 4:30 PM to 6:00 AM
Canyon to Lake Open   Rubber tracked oversnow concession vehicles
Canyon to Tower CLOSED CLOSED CLOSED ♦    (Dunraven Pass)
Grant to South Entrance Open   Rubber tracked oversnow concession vehicles
Junction to Chief Joseph Hwy CLOSED CLOSED CLOSED
Lake to East Entrance CLOSED CLOSED CLOSED - Due to Avalanche Danger
Lake to West Thumb Open   Rubber tracked oversnow concession vehicles
Madison to Old Faithful Open   Rubber tracked oversnow concession vehicles
Madison to West Yellowstone Open   Rubber tracked oversnow concession vehicles
Mammoth to Norris Open   Rubber tracked oversnow concession vehicles
Norris to Canyon Open   Rubber tracked oversnow concession vehicles
Norris to Madison Open   Rubber tracked oversnow concession vehicles
Old Faithful to Grant Open   Rubber tracked oversnow concession vehicles

* = Open year-round to wheeled vehicle travel.
NR=No Restrictions / STA=Snow Tires Advised / STR=Snow Tires Required


The park service plowing schedule for roads for the spring season.

******** FOR CURRENT ROAD INFORMATION PLEASE CALL 307-344-2117 ********

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    Caution advised for snow falling off of building roofs. Park accordingly.

    Dangerous avalanche conditions may already exist in many back country areas, please call the Recorded Avalanche Advisory 406-587-6981 for the most current conditions.

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Yellowstone Seven Day Forecast on February 01, 2013
by the National Weather Service Riverton, WY

Today: Snow. Snow accumulation of 2 to 3 inches. Total snow accumulation 3 to 5 inches. West winds around 15 mph. Chance of snow near 100 percent. Highs 24°F to 30°F.

Tonight: Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Southwest winds around 15 mph early in the evening. Lows 7°F to 13°F.

Saturday: Partly cloudy in the morning then clearing. Highs 26°F to 32°F.

Saturday Night: Mostly clear. Lows 2°F to 10°F.

Sunday: Partly cloudy. Highs 27°F to 33°F.

Sunday Night: Partly cloudy. Lows 8°F to 14°F.

Monday: Mostly cloudy in the morning then becoming partly cloudy. Highs 27°F to 33°F.

Monday Night: Partly cloudy. Lows 13°F to 19°F.

Tuesday: Partly cloudy. Highs 32°F to 38°F.

Tuesday Night: Partly cloudy. Lows 13°F to 19°F.

Wednesday: Mostly cloudy with a 30 percent chance of snow. Highs 26°F to 32°F.

Wednesday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 10°F to 16°F.

Thursday: Partly cloudy. Highs 26°F to 32°F.

Snowflake Hazardous Weather Forecast Snowflake Yellowstone & Grand Teton Forecasts Snowflake Gibbon Falls Forecast Snowflake Mammoth Forecast Snowflake Midway Forecast Snowflake Norris Forecast Snowflake Old Faithful Forecast Snowflake

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* * * Snow Depth Totals as reported at SNOTELs * * *
Station Depth (inches) Station Depth (inches)
Black Bear 92 Parker Peak 58
Blackwater 52 Snake River Station 42
Canyon 36 Sylvan Lake 52
Evening Star 69 Sylvan Road 33
Fisher Creek 82 Thumb Divide 44
Grassy Lake 75 Two Ocean Plateau 66
Lewis Lake Divide 71 West Yellowstone 27
Madison Plateau 60 Whiskey Creek 38
Northeast Entrance 26 Wolverine 27

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Avalanche Advisory

from the Gallatin National Forest Avalanche Center - February 01, 2013 - this report is by Mark Staples. This advisory does not apply to operating ski areas.

Mountain Weather

Yesterday an additional 8 inches of dense snow fell in the Bridger Range; 4 to 6 inches fell near Hyalite, Big Sky and Cooke City; and 2 to 3 inches fell near West Yellowstone. This morning temperatures were in the high teens and low 20s Fahrenheit with winds blowing 10 to 15 mph from the west and gusting 20 to 30 mph. Today temperatures may drop a few degrees and winds will ease just a little shifting to the West-northwest. Snowfall will end around midday with 1 to 3 inches accumulating in most areas. By late afternoon a few rays of sunshine may break through the clouds making way for more sunshine this weekend.

Snowpack and Avalanche Discussion:

Cooke City:

During the last three days, 1.5 feet of snow fell near Cooke City although we received reports of 2+ feet of new snow in some areas. With strong winds blowing during the last 2 days and temperatures rising and falling during the storms, there are several different layers in the new snow. Avalanches will easily break on one of these layers. At lower elevations in places like "Town Hill", the snowpack was thin and weak prior to these storms. Avalanches could break deeper in the snowpack and be triggered remotely in these areas. For today with more snow falling, human triggered avalanches are likely and the Avalanche Danger is rated CONSIDERABLE.

Madison, and Southern Gallatin Ranges, and Lionhead Area near West Yellowstone:

During the last three days, 1.5 feet of snow fell near Big Sky and 1 foot fell near West Yellowstone. These areas also received plenty of wind and ski patrols have triggered avalanches breaking within the new snow. Another problem is several layers (video, photo) of weak facets (and some surface hoar - photo) buried 1.5-2 feet deep under the new snow. These layers have been most reactive in stability tests on S aspects where a skier experienced collapsing and cracking on Cedar Mountain yesterday. These layers also exist on North aspects and with so much new snow, I would be worried on these aspects as well today. New snow, wind, and buried weak layers mean dangerous avalanche conditions exist today and the Avalanche Danger is rated CONSIDERABLE.

Bridger and Northern Gallatin Ranges:

During the last three days, 3.5 feet of snow fell in the Bridger Range (2 to 3 inches of snow water equivalent) and 2 feet fell in the northern Gallatin Range (2 inches of SWE), thus a lot of weight was added to the snowpack. Temperatures have gone up and down since Tuesday creating different layers of new snow with varying densities. Additionally, strong West and Northwest winds blew on Wednesday and Thursday transporting snow onto the lee sides of ridges and gullies. On most slopes the main concern will be avalanches breaking within layers of the new snow (video).

A scarier and longer lasting problem exists on slopes that had a thin snowpack (2.5 deep or less) prior to this week's snowfall. The snowpack on these slopes weakened and faceted during dry, cold weather in January and is now struggling to support the heavy load of new snow. These slopes exist at lower elevations like Mount Ellis where Eric found very unstable conditions yesterday and experienced widespread collapsing and cracking. These slopes also exist at higher elevations like some Southwest aspects (snowpack photo) on the West side of the Bridger Range.

For today, with a lot of new, heavy snow and more falling this morning, I'm staying conservative and rating the Avalanche Danger HIGH on wind loaded slopes. Human triggered avalanches are just as likely on all other slopes which have a CONSIDERABLE Avalanche Danger.

* * Avalanche Accident * *

A skier was caught and fully buried in an avalanche in the Centennial Mountains along the Montana / Idaho border. His partners were all in safe locations watching him descend, all had rescue gear, and uncovered him in about 3 minutes – good job! He was injured as the avalanche carried him through trees fortunately he did not sustain serious injuries. Every accident is a learning opportunity and we'll post more info as we get it.

The next advisory tomorrow morning at 7:30 a.m. If you have any snowpack or avalanche observations, drop us a line at or call us at: 406-587-6984.


1. For links to Articles, Education and (photos), (snowpits), or (videos) listed in the above report, please visit this Link.

2. They have recently uploaded more photos and snowpits to their web site, more than what are linked in the advisory above.

3. They have creating a series of "How To…" stability test videos. So far they have clips on performing a CT and ECT. They are located under Stability Tests on their Resources page.

Information provided by Doug Chabot, Mark Staples, and Eric Knoff from the Gallatin National Forest Avalanche Center. For Photos and Videos, please visit the Avalanche Centers Website!

If you have any snowpack or avalanche observations, drop them a line at or call: 406-587-6984.

For detailed Avalanche Terms utilized here, please see the Avalanche Glossary.

Avalanche Danger Scale

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Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center

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