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Daily Winter Weather Report

Date: Wednesday - February 02, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 5 -40 -39 0 40   Calm / Clear
East Entrance 9 -32 -26 T 36   Calm / Clear
Grant Village 23 -38 -3 0 44   Calm / Clear
Lake 7 -30 -30 0 30   Calm / Clear
Lamar -7 -42 -40 0 27   Calm / Clear
Madison 6 -43 -39 0 28   Calm / Clear
Mammoth 4 -18 -16 0 20   SW@1-3mph / Clear
Old Faithful 8 -35 -35 0 28   Calm / Clear
Snake River 8 -32 -30 0 50   Calm / Clear
Tower -2 -32 -27 0 26   S@10-12mph / Clear
West Entrance 10 -38 -35 0 35   Calm / Clear
T=Trace / BC=Broken Clouds / OC=Overcast / SC=Scattered Clouds
All Temperatures are in °F ~ All Snow Depths are in Inches

* * * Road Conditions * * *
Road Section Status Conditions Public Access / Info
Gardiner to Mammoth YR Fair STR
Mammoth to Tower YR Fair STR
Tower to NE Entrance YR Fair STR
Beartooth Highway CLOSED * CLOSED * CLOSED *
Canyon to Lake Open Good Oversnow
Firehole Canyon Drive Open - Oversnow - Snowcoaches only in the morning
Grant to South Entrance Open Good Oversnow
Junction to Chief Joseph Hwy CLOSED * CLOSED * CLOSED *
Lake to East Entrance Open Good Oversnow
Lake to West Thumb Open Good Oversnow
Madison to Old Faithful Open Good Oversnow
Madison to West Yellowstone Open Good Oversnow
Mammoth to Norris Open Fair Oversnow
Norris to Canyon Open Fair Oversnow
Norris to Madison Open Good Oversnow
Old Faithful to Grant Open Good Oversnow

YR=Year Round / NR=No Restrictions / STA=Snow Tires Advised / STR=Snow Tires Required


# 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 02 February 2011
by the National Weather Service Riverton, WY

Tonight...Partly cloudy. Patchy freezing fog after midnight. Lows -5°F to -15°F.

Thursday...Partly cloudy. Patchy freezing fog in the morning. Isolated snow showers in the afternoon. Highs 21°F to 27°F. Chance of precipitation 20 percent. Lowest wind chill readings -17°F to -27°F in the morning.

Thursday Night...Not as cold. Cloudy with a 50 percent chance of snow. Lows 3°F to 11°F. Southwest winds around 15 mph after midnight.

Friday...Snow likely. Snow accumulation of 2 to 4 inches. Highs 23°F to 29°F. West winds around 15 mph. Chance of snow 60 percent.

Friday Night...Snow likely. Snow accumulation of 2 to 4 inches. Lows 15°F to 21°F. West winds around 15 mph. Chance of snow 70 percent.

Saturday...Snow likely. Moderate snow accumulations. Highs 23°F to 29°F. Chance of snow 70 percent.

Saturday Night...Mostly cloudy with a 50 percent chance of snow. Lows 11°F to 17°F.

Sunday...Cloudy with a 50 percent chance of snow. Highs 20°F to 26°F.

Sunday Night...Colder. Mostly cloudy with a 30 percent chance of snow. Lows -1°F to 5°F.

Monday...Partly cloudy with a 20 percent chance of snow. Highs 13°F to 19°F.

Monday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows -1°F to -7°F.

Tuesday...Mostly cloudy with a 20 percent chance of snow. Highs 16°F to 22°F.

Tuesday Night...Partly cloudy. Lows -5°F to 1°F.

Wednesday...Partly cloudy with a 20 percent chance of snow. Highs 13°F to 19°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 85 Parker Peak 74
Blackwater 58 Snake River Station 28
Canyon 42 Sylvan Lake 54
Evening Star 75 Sylvan Road 40
Fisher Creek 84 Thumb Divide 45
Grassy Lake 76 Two Ocean Plateau 66
Lewis Lake Divide 73 West Yellowstone 35
Madison Plateau 56 Whiskey Creek 46
Northeast Entrance 33 Wolverine 39

Avalanche Information
from the Gallatin National Forest Avalanche Center - February 02, 2011 - this report is by Doug Chabot

Mountain Weather

With temperatures of zero this morning I'm betting the groundhog is a no-show. Today will be a beautiful winter day with sunny skies, mountain temperatures rising into the teens and north to northwest winds blowing 10-20 mph. High pressure continues to dominate our weather pattern. Tonight, clear skies will help the temperatures plummet to below zero and warm up even more tomorrow.

Snowpack and Avalanche Discussion:

The Bridger, Madison and Gallatin Ranges, the Lionhead area near West Yellowstone:

If the air is minus 15, but my boots are in 32 degree standing water, my feet should be warm, right? Pushing the sled out of a slushy creek proved this just isn't so. Mark and I rode up Little Bear to Wheeler Peak in the northern Gallatin Range yesterday. The snowpack was thin and ranged from three to four feet deep with its lower half consisting of weak, faceted snow. But weak does not always mean unstable. In the absence of cracking, collapsing, recent avalanche activity, and poor test scores, we've got Very Good snow stability.

From the Bridger Range to Big Sky to West Yellowstone the Avalanche Danger is rated LOW. But even during times of widespread stability, there are always a few individual slopes that are not team players and could possibly be triggered. In one pit yesterday we found a pocket of preserved surface hoar from December 5th—an example of these crystals resilience. That's why we wear beacons, ski and snowmobile one at a time and do stability tests; because sometimes we get surprised. A low danger does not mean no danger.

The mountains around Cooke City and the Washburn Range:

The snowpack in the Cooke City region is deep and stable. The only exception is steep wind-loaded slopes. There's no shortage of snow to blow around in Cooke and folks reported small avalanches involving new, wind-blown snow in the last 48 hours. A YouTube clip shows a skier triggering a small slide on Monday, and yesterday a skier noted one natural (photo) and another human triggered slide in Sheep Creek.

For today, the Avalanche Danger is rated MODERATE on wind-loaded slopes steeper than 35 degrees. All other slopes have a LOW Avalanche Danger.

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

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.

West Yellowstone: Beacon Park Operational

Skiing or riding near West Yellowstone? Test your beacon skills at a beacon park near the old airport where you can search for pre-placed beacons switched on/off by a control panel. Look for it by orange snow fence and signage just south of the snow cross track.


The 9th Annual King and Queen of the Ridge will be held at Bridger Bowl on Saturday, February 12. ALL proceeds go to the Friends of the Avalanche Center who use the money to promote avalanche education in southwest Montana. Last winter we taught 64 classes reaching over 4,900 people. You can help raise money to continue this education in 2 ways:

1). Get pledges and hike the ridge. You don't have to do 20 laps – you can get flat pledges and hike just once! Or you can test your mettle and try and break John Yarington's record of 29 laps in 5 hours.

2). Sponsor someone. If you don't have someone to sponsor, consider sponsoring the GNFAC since we'll be hiking for dollars. Click Here for more information and registration forms.

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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