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Daily Winter Weather Report

Date: Monday - 13 February 2012

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 33 11 14 T 33 OC Calm / Snowing
East Entrance 35 18 21 2 36 OC Calm
Grant Village 31 21 31 .10 44 OC Calm
Lake 33 17 18 .25 35 OC Calm / Snowing
Lamar 36 12 16 0 14 OC Calm
Madison 36 24 36 T 22 OC Calm / Snowing
Mammoth 34 19 34 0 8 OC E@2mph
Old Faithful 37 22 24 0 28 OC S@2-4mph
Pahaska 24 23 23 T - OC Calm
Snake River 41 25 25 1 57 OC Calm / Snowing
Soda Butte 14 10 14 0 - OC Calm
Thumb Divide 24 22 23 .20 44 OC Calm
Tower 41 13 17 0 20 OC Calm
West Entrance 38 24 25 T 33 OC 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 Advised
Mammoth to Tower YR - Snow Tires Advised
Tower to NE Entrance YR - Snow Tires Advised
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 - 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 - All oversnow vehicles
Madison to West Yellowstone Open - All oversnow vehicles
Mammoth to Norris Open - All oversnow vehicles
Norris to Canyon Open - All oversnow vehicles
Norris to Madison Open - 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 13 February 2012
by the National Weather Service Riverton, Wyoming

Today...Patchy freezing fog in the morning. Cloudy with a 50 percent chance of snow. Highs 24°F to 30°F.

Tonight...Mostly cloudy with a 20 percent chance of snow. Lows 12°F to 18°F.

Tuesday...Cloudy with a 50 percent chance of snow. Highs 21°F to 27°F.

Tuesday Night...Mostly cloudy with a 40 percent chance of snow. Lows 8°F to 14°F.

Wednesday...Mostly cloudy with a 20 percent chance of snow. Highs 21°F to 27°F.

Wednesday Night...Partly cloudy with a 20 percent chance of snow. Lows 5°F to 11°F.

Thursday...Partly cloudy. Highs 23°F to 29°F.

Thursday Night...Partly cloudy with a 20 percent chance of snow. Lows 7°F to 13°F.

Friday...Mostly cloudy in the morning then becoming partly cloudy. A 20 percent chance of snow. Highs 25°F to 31°F.

Friday Night...Partly cloudy with a 20 percent chance of snow. Lows 5°F to 11°F.

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

Saturday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 8°F to 14°F.

Sunday...Mostly cloudy with a 20 percent chance of snow. 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 79 Parker Peak 61
Blackwater 66 Snake River Station 50
Canyon 37 Sylvan Lake 48
Evening Star 73 Sylvan Road 39
Fisher Creek 79 Thumb Divide 44
Grassy Lake 75 Two Ocean Plateau 81
Lewis Lake Divide 69 West Yellowstone 31
Madison Plateau 49 Whiskey Creek 40
Northeast Entrance 31 Wolverine 28

Avalanche Information
from the Gallatin National Forest Avalanche Center - 13 February 2012 - 7:30 am - this report is by Eric Knoff. This advisory does not apply to operating ski areas.

Mountain Weather

During the past twenty four hours no new snow has fallen over our forecast area. This morning, mountain temperatures are in the teens Fahrenheit under mostly cloudy skies and winds are blowing out of the West-northwest at 5-15 mph. Today, temperatures will warm into the mid twenties Fahrenheit and winds will remain light out of the West-northwest at 5-15 mph. A weak weather disturbance will bring a chance of snow showers to the mountains through the day. A trace to one inch is possible by this afternoon. A better chance of snow will arrive later tomorrow.

Snowpack and Avalanche Discussion:

The mountains around Cooke City:

Conditions remain touchy in the mountains around Cooke City. Yesterday, skiers remotely triggered an avalanche on a Southeast facing slope around 9,500 feet. A large natural avalanche was also observed on the south face of Mount Abundance, the same slope that ripped to the ground eleven days ago. When natural activity and remote triggering take place, it's a clear indication very unstable conditions exist.

It was also noted slopes that avalanched earlier in the season are avalanching again. Unfortunately, this may be a trend that sticks around – something to consider when riding in the backcountry.

While the snowpack works overtime to adjust, it will remain sensitive to the weight of a skier or rider. Slopes with a southerly aspect appear to be the most active, but all slopes will be capable of producing avalanches.

Today, human triggered avalanches remain likely and the Avalanche Danger is rated CONSIDERABLE.

The Madison Range, southern Gallatin Range and the Lionhead area near West Yellowstone:

The snowpack resembles a crooked old house with a weak foundation. It has a rickety structure but without a significant load, it has entered a fragile state of balance. Applying load to this snowpack would be like building an additional level on the already shaky house - potentially causing the whole thing to come crashing down.

Yesterday, I skied in the southern Madison Range and found a snowpack that made me cringe. However, my partner and I did not experience any signs of instability and observed no natural activity, a sign the snowpack is well adjusted.

Triggering an avalanche today will require finding the right spot on the right slope. Areas where the snowpack is thinner, mainly in steep rocky terrain or around thin scoured areas will be likely trigger points. Although the avalanche danger is settling down, now is not the time to push it in big terrain. If an avalanche is triggered, it will likely break deep and carry severe consequences.

Today, heightened avalanche conditions exist on specific terrain features and the Avalanche Danger is rated MODERATE.

The northern Gallatin Range and the Bridger Range:

The snowpack structure between the northern Gallatin Range and Bridger Range is dissimilar. The northern Gallatin Range has a deeper more stable snowpack, while the Bridger Range has a pack that is shallow and weak. Despite their differences, the threat of triggering an avalanche remains the same.

The most likely areas where a skier or rider will find unstable snow will be in steep rocky terrain. On Saturday a skier triggered and was caught in a small slide up the Flanders drainage in Hyalite. The slide occurred after the skier jumped 3 to 4 feet onto a small patch of snow in rocky terrain. The snow released carrying the skier with it. Fortunately the skier escaped unharmed.

This is a fine example that human triggered avalanches remain possible in steep terrain where the Avalanche Danger is rated MODERATE. 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!


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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