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Daily Winter Weather Report

Date: Monday - 06 February 2012

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 34 -20 -20 0 32 C Calm
East Entrance 38 -13 -11 0 32 C Calm
Grant Village 1 -16 1 0 39 C Calm
Lake 27 -10 -9 0 33 C Calm
Lamar 3 -15 3 0 12 C Calm
Madison 27 -17 -14 0 21 C Calm
Mammoth 16 6 6 0 5 C SW@2-3mph
Old Faithful 40 -15 -13 0 30 C Calm
Pahaska 6 -3 -2 0 - C Calm
Snake River 36 -17 -15 0 56 C Calm
Soda Butte -5 -15 -15 0 - C Calm
Thumb Divide -3 -16 -16 0 - C Calm
Tower 27 -8 -2 0 17 C Calm
West Entrance -4 -14 -14 0 32 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 06 February 2012
by the National Weather Service Riverton, Wyoming

Today...Sunny in the morning then becoming partly cloudy. Highs 24°F to 30°F. Lowest wind chill readings -10°F to -20°F in the morning.

Tonight...Mostly cloudy. Lows 0°F to 6°F.

Tuesday...Partly cloudy in the morning then clearing. Highs 23°F to 29°F.

Tuesday Night...Partly cloudy in the evening then clearing. Patchy fog after midnight. Lows 0°F to 6°F.

Wednesday...Partly cloudy in the morning then clearing. Patchy fog in the morning. Highs 25°F to 31°F.

Wednesday Night...Partly cloudy with a 20 percent chance of snow. Lows 6°F to 12°F.

Thursday...Partly cloudy with a 20 percent chance of snow. Highs 26°F to 32°F.

Thursday Night...Partly cloudy in the evening then clearing. Lows 5°F to 11°F.

Friday...Mostly sunny. Highs 27°F to 33°F.

Friday Night...Mostly clear. A 20 percent chance of snow after midnight. Lows 10°F to 16°F.

Saturday...Partly cloudy with a 20 percent chance of snow. Highs 27°F to 33°F.

Saturday Night...Partly cloudy with a 20 percent chance of snow. Lows 10°F to 16°F.

Sunday...Partly cloudy with a 20 percent chance of snow. Highs 25°F to 31°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 79 Parker Peak 56
Blackwater 59 Snake River Station 51
Canyon 37 Sylvan Lake 45
Evening Star 71 Sylvan Road 36
Fisher Creek 79 Thumb Divide 42
Grassy Lake 75 Two Ocean Plateau 80
Lewis Lake Divide 70 West Yellowstone 31
Madison Plateau 51 Whiskey Creek 39
Northeast Entrance 28 Wolverine 26

Avalanche Information
from the Gallatin National Forest Avalanche Center - 06 February 2012 - 7:30 am - this report is by Eric Knoff. This advisory does not apply to operating ski areas.

Mountain Weather

A fast moving cold front is pushing into southwest Montana from the north. Very little moisture is associated with this front keeping the chance of measurable precipitation low. However, our area will see increasing clouds and cooler temperatures through the day. Currently, skies are clear, winds are light out the North-northeast and temperatures are ranging from the single digits to low teens Fahrenheit. Mountain temperatures will climb into the high teens to low twenties Fahrenheit today and winds will gradually shift to the South-southeast.

Snowpack and Avalanche Discussion:

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

Yesterday, Doug investigated a large natural side that occurred in the Lionhead area on Friday. He found an avalanche that broke up to 3 feet deep, three hundred feet across and ran nearly 800 feet vertical. It was a hard slab that failed on facets near the ground. What was surprising about this avalanche is that it naturally released after the area received only a few inches of new snow. This illustrates the weak and fragile nature of the snowpack in the mountains near West Yellowstone.

The snowpack in the mountains around Cooke City is spatially variable. Some slopes have a deeper, stronger snowpack while others have a layer of facets buried 3 to 4 deep that is still causing avalanches. Slopes with a southerly aspect have the widest distribution of this layer. On Thursday I remotely triggered a large slide on the south face of Mount Abundance and on Saturday riders observed a natural avalanche in the same area.

A calm weather pattern over the past few days is making it more difficult to trigger avalanches. However, it is still very possible to trigger a slide on slopes steeper than 35 degrees. Avalanches will be easier to trigger in areas where the snowpack is thinner, such as rock outcroppings or thin scoured areas.

Today, the Avalanche Danger is CONSIDERABLE on slopes steeper than 35 degrees. Less steep slopes have a MODERATE Avalanche Danger.

The Bridger Range and northern Madison Range:

Mild temperatures, light winds and the lack of measurable precipitation have allowed the snowpack to become well adjusted. Although it is becoming increasingly difficult to trigger a slide, it is not entirely out of the question. Steep, upper elevation slopes, specifically those that have been previously affected by the wind hold the greatest potential for producing an avalanche. Triggering a slide today will require finding the right spot on the right slope, also known as the sweet spot or trigger point. Places where the snowpack is thinner, mainly around rock outcroppings and shallow scoured areas will be likely trigger points.

Although the avalanche danger is trending down, human triggered avalanches remain possible and the Avalanche Danger is rated MODERATE.

The northern Gallatin Range:

The northern Gallatin Range, especially the Hyalite Canyon area has the strongest snowpack in our forecast area. Limited distribution of buried persistent weak layers and minimal snowfall has allowed the snowpack to find a stable balance. It has been weeks since any natural or human triggered avalanches have been reported. This does not mean that avalanches should be entirely written off. Steep slopes, specifically those in tight gullies or in upper elevation terrain continue to hold the possibility of producing a slide. When traveling in steep terrain, safe backcountry protocol applies and always be thinking about the consequences of a slide.

Today, slopes steeper than 35 degrees have a MODERATE Avalanche Danger. Less steep slopes 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 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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