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Daily Winter Weather Report

Date: Thursday - February 03, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 18 -39 -17 0 40   Calm / Clear
East Entrance 27 -26 0 0 36   Calm / Clear
Grant Village 5 -15 5 0 44   Calm / Clear
Lake 11 -30 -10 0 30   Calm / Clear
Lamar -5 -41 -17 0 27   Calm / Clear
Madison 6 -39 -15 0 28   Calm / Clear
Mammoth 14 -15 3 0 20   SSW@4-6mph / Clear
Old Faithful 27 -36 -14 0 28   WNW@2mph / gust 3mph / Clear
Snake River 22 -33 -16 0 49   Calm / Clear
Tower 0 13 -1 0 26   Calm / Clear
West Entrance 15 -35 -20 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 03 February 2011
by the National Weather Service Riverton, WY

Today...Mostly sunny in the morning...then mostly cloudy with isolated snow showers in the afternoon. Highs 21°F to 27°F. Chance of snow 20 percent. Lowest wind chill readings -17°F to -27°F in the morning.

Tonight...Cloudy. Chance of snow in the evening...then snow likely after midnight. Snow accumulation of 1 to 2 inches. Lows 4°F to 12°F. Southwest winds around 15 mph early in the morning. Chance of snow 60 percent.

Friday...Snow likely. Snow accumulation of 2 to 3 inches. Highs 24°F to 30°F. Southwest winds around 15 mph early in the morning becoming west around 15 mph in the afternoon. Chance of snow 70 percent.

Friday Night...Snow likely. Snow accumulation of 2 to 3 inches. Lows 15°F to 21°F. West winds around 15 mph. Chance of snow 70 percent.

Saturday...Snow in the morning...then snow likely in the afternoon. Snow accumulation of 2 to 4 inches. Highs 22°F to 28°F. Chance of snow 90 percent.

Saturday Night...Snow likely. Light snow accumulations. Lows 12°F to 18°F. Chance of snow 70 percent.

Sunday...Mostly cloudy in the morning then becoming partly cloudy. A 40 percent chance of snow. Highs 13°F to 19°F.

Sunday Night...Much colder. Mostly cloudy with a 40 percent chance of snow. Lows -6°F below to 0°F.

Monday...Partly cloudy with a 30 percent chance of snow. Highs 11°F to 17°F.

Monday Night...Partly cloudy with a 20 percent chance of snow. Lows -3°F to -9°F.

Tuesday...Partly cloudy in the morning then becoming mostly cloudy. A 20 percent chance of snow. Highs 13°F to 19°F.

Tuesday Night...Partly cloudy in the evening then becoming mostly cloudy. A 20 percent chance of snow. Lows -5°F below to 1°F.

Wednesday...Partly cloudy. Highs 11°F to 17°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 84 Parker Peak 72
Blackwater 58 Snake River Station 28
Canyon 41 Sylvan Lake 54
Evening Star 74 Sylvan Road 40
Fisher Creek 82 Thumb Divide 44
Grassy Lake 75 Two Ocean Plateau 66
Lewis Lake Divide 72 West Yellowstone 34
Madison Plateau 56 Whiskey Creek 46
Northeast Entrance 33 Wolverine 38

Avalanche Information
from the Gallatin National Forest Avalanche Center - February 03, 2011 - this report is by Doug Chabot

Mountain Weather

Under clear skies, mountain temperatures range from 12 to 20 degrees above zero. West to northwest winds have increased from 10-15 mph yesterday morning to 20-30 mph. They will get even stronger this afternoon as the high pressure ridge flattens and clouds appear. Tonight, temperatures will fall into the low teens and scattered snowfall will measure a trace to one inch by morning. A strong northwest flow builds tomorrow and the weather models show a snowy weekend. My fingers are crossed.

Snowpack and Avalanche Discussion:

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

The winds have not been confined to the ridgetops. Steady speeds of 20-30 mph are blowing downhill and across slopes at mid and lower elevations. In the last 24 hours wind drifts formed in gullies and on small terrain features which could be triggered today. I don't expect these wind pillows to be very big since there's not much loose snow to blow around, but even shallow slabs can fracture and carry us into terrain traps.

There are no consistent weak layers buried in our snowpack. We have very good snow stability even though thinner slopes have lots of facets. Mark and I found this on Wheeler Mountain in the northern Gallatin Range on Tuesday. Without a big load of snow, these slopes would be difficult to trigger. Eric found stable conditions yesterday in Dudley Creek in the northern Madison Range. He also saw an old avalanche from 12 days ago; weak, faceted snow formed around a rock band and then got loaded to its breaking point by new and windblown snow.

It looks like we're poised to bury the surface weaknesses that formed during the cold, clear weather this week. Surface hoar and near surface facets are on many slopes. Some may already be buried under new wind drifts. If the predicted snow falls, then this layer will be preserved and quickly become unstable.

Recently formed wind drifts are today's primary avalanche concern. Throughout our advisory area the Avalanche Danger is rated MODERATE on all wind-loaded slopes, and a LOW Avalanche Danger everywhere else.

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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