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Daily Winter Weather Report

Date: Saturday - 04 February 2012

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 1 -12 -12 0 33 C Calm
East Entrance 29 -12 -11 0 32 C Calm
Grant Village -6 -16 -16 0 41 C Calm
Lake 31 -10 -10 0 35 C Calm
Lamar 22 -15 -15 0 12 C Calm
Madison -5 -10 -10 0 20 C Calm
Mammoth 16 5 7 T 6 C SSW@2-5mph
Old Faithful 34 -16 -14 0 30 C Calm
Pahaska 4 -3 -1 T - C Calm
Snake River 30 -12 -11 0 59 C Calm
Soda Butte -5 -15 -13 .14 - C Calm
Thumb Divide -6 -16 -16 0 - C Calm
Tower 26 -8 -4 0 17 C S@3-5mph
West Entrance 32 -17 -16 0 33 C Calm
BC=Broken Clouds / C=Clear / OC=Overcast / SC=Scattered Clouds / T=Trace
All Temperatures are in °F ~ All Snow Depths are in Inches

* * * Road Conditions * * *
Road Section Status Conditions Public Access / Info
Gardiner to Mammoth YR   Snow Tires Required
Mammoth to Tower YR   Snow Tires Required
Tower to NE Entrance YR   Snow Tires Required
Beartooth Highway CLOSED * CLOSED * CLOSED *
Canyon to Lake Open   All oversnow vehicles
Canyon to Tower CLOSED * CLOSED * CLOSED *
Firehole Canyon Drive CLOSED CLOSED CLOSED
Grant to South Entrance Open Good All oversnow vehicles
Junction to Chief Joseph Hwy CLOSED * CLOSED * CLOSED *
Lake to East Entrance Open   All oversnow vehicles
Lake to West Thumb Open   All oversnow vehicles
Madison to Old Faithful Open Good All oversnow vehicles
Madison to West Yellowstone Open Good All oversnow vehicles
Mammoth to Norris Open Good All oversnow vehicles
Norris to Canyon Open Good All oversnow vehicles
Norris to Madison Open Fair All oversnow vehicles
Old Faithful to Grant Open   All oversnow vehicles

YR = Open Year Round / NR = No Restrictions


# Poor road conditions - bare spots and melting snow - Restricted to Snowcoaches Only.

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

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


Yellowstone Seven Day Forecast on 04 February 2012
by the National Weather Service Riverton, Wyoming

Today...Sunny. Patchy fog in the morning. Highs 27°F to 33°F.

Tonight...Clear. Patchy fog after midnight. Lows 4°F to 10°F.

Sunday...Sunny. Patchy fog in the morning. Highs 29°F to 35°F.

Sunday Night...Mostly clear in the evening then becoming partly cloudy. Lows 2°F to 8°F.

Monday...Partly cloudy. Highs 26°F to 32°F.

Monday Night...Partly cloudy. Lows 2°F to 8°F.

Tuesday...Mostly sunny. Highs 24°F to 30°F.

Tuesday Night...Mostly clear. Lows 4°F to 10°F.

Wednesday...Mostly sunny in the morning then becoming partly cloudy. Highs 25°F to 31°F.

Wednesday Night...Partly cloudy. Lows 8°F to 14°F.

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

Thursday Night...Partly cloudy. Lows 9°F to 15°F.

Friday...Partly cloudy. Highs 26°F to 32°F.

Snowflake Hazardous Weather Snowflake Gibbon Falls Forecast Snowflake Mammoth Forecast Snowflake Midway Forecast Snowflake Norris Forecast Snowflake Old Faithful Forecast Snowflake

* * * Snow Depth Totals as reported at SNOTELs * * *
Station Depth (inches) Station Depth (inches)
Black Bear 81 Parker Peak 58
Blackwater 62 Snake River Station 53
Canyon 38 Sylvan Lake 47
Evening Star 74 Sylvan Road 36
Fisher Creek 82 Thumb Divide 42
Grassy Lake 76 Two Ocean Plateau 82
Lewis Lake Divide 72 West Yellowstone 32
Madison Plateau 52 Whiskey Creek 40
Northeast Entrance 29 Wolverine 27

Avalanche Information
from the Gallatin National Forest Avalanche Center - 04 February 2012 - 7:30 am - this report is by Eric Knoff. This advisory does not apply to operating ski areas.

Mountain Weather

A ridge if high pressure is dominating the weather pattern. Currently, skies are clear, temperatures are in the mid teens Fahrenheit and winds are blowing out of the West-northwest at 5-15 mph. Today will provide plenty of sunshine allowing temperatures to climb into the mid 30s Fahrenheit. Winds will stay light out of West-southwest. Clear and calm weather will continue through the weekend.

Snowpack and Avalanche Discussion:

The southern Madison and southern Gallatin Ranges, the Lionhead area near West Yellowstone and the mountains around Cooke City:

The avalanche danger around Cooke City is deceiving. Fresh snow on top of a supportable slab is making travel easy, allowing skiers and riders to venture further into avalanche terrain. While conditions look and feel great – there is a significant problem lurking deep within the snowpack.

A layer of weak facets buried beneath a 3 to 4 foot slab is producing dangerous avalanche conditions. On Friday, I triggered a large slide on the south face of Mount Abundance from low on the slope. This slide was triggered in an area where the snowpack was only ankle to knee deep.

Deep slab instabilities are tricky and very dangerous. It often takes finding the "sweet spot" to trigger a slide. Areas where the snowpack is thinner, specifically around rock bands and tree outcroppings will be likely trigger points. While conditions may feel stable they are not. This avalanche is a major warning sign and evidence of what's possible on other slopes.

The snowpack near the Taylor Fork and West Yellowstone is just as weak and unstable. Over the past few days multiple natural and human triggered avalanches have been observed in the area. A cohesive slab 1 to 3 feet thick is resting over weak snow near the ground making the snowpack sensitive to the weight of a skier or rider. Slopes steeper than 35 degrees and all wind loaded slopes will be especially avalanche prone.

Today, dangerous avalanche conditions exist and the Avalanche Danger is CONSIDERABLE.

The Bridger Range and northern Madison Range:

Today's primary avalanche concern in the northern Madison Range will be wind loaded slopes. South winds over the past few days transported snow from Thursday onto north facing slopes, producing sensitive soft slabs. Yesterday, the Moonlight Basin Ski Patrol triggered multiple small to medium sized avalanches in upper elevation, north facing terrain. These slides were confined to the new snow and nothing stepped down to deeper layers.

In the Bridger Range, slopes directly below the ridgeline, specifically in steep-rocky terrain will be the most likely to produce an avalanche.

All the ingredients for avalanches are present making human triggered avalanches possible and the Avalanche Danger is rated MODERATE.

The northern Gallatin Range:

The northern Gallatin Range especially the Hyalite Canyon area has received more consistent snowfall throughout this season. This snowfall has been just enough to build a snowpack lacking widespread weak layers. Today, slopes steeper than 35 degrees have a MODERATE Avalanche Danger. Slopes less than 35 degrees have a LOW Avalanche Danger.

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.

Beacon Parks

The Friends of the Avalanche Center installed a Beacon Training Park outside West Yellowstone. It's located south of town on the main snowmobile trail. Stop by and do a quick practice before heading off into the mountains!


February 4: Poker Run

The Gallatin Valley Snowmobile Association is sponsoring their annual Buck Ridge Poker Ride this Saturday. All proceeds benefit the Friends of the GNFAC. Registration is at 9 a.m. in the Buck Ridge parking lot. More info at

February 8: 4th Annual Montana Ale Works Wine Dinner

Come join us for a wonderful, social evening at Montana Ale Works. Menu and ticket information is here:

10th Annual King and Queen of the Ridge

The 10th Annual King and Queen of the Ridge Hike/Ski-a-thon fundraiser is Saturday, Feb 11th. The event supports avalanche education in southwest Montana. Collect pledges for one, two or the most Ridge hikes you can do in the five hours of competition. 100% of the proceeds go to the Friends of Gallatin National Forest Avalanche Center. Kids and families are encouraged to hike too! More Information / Registration Form.

1. We've recently uploaded more photos and snowpits to our web site, more than what are linked in the advisory.

2. We're creating a series of "How To…" stability test videos. So far we've got clips on performing a CT and ECT. There are located under Stability Tests on the Resources page.

3. Check out all our education programs, Click Here.

Information provided by Doug Chabot, Mark Staples, and Eric Knoff from the Gallatin National Forest Avalanche Center. For Events and Education, or 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

Back to the Yellowstone Daily Winter Reports or the Yellowstone Weather Page

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

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