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Daily Winter Weather Report

Date: Saturday - February 05, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 29 15 18 7 46 BC Winds 5-10mph / lite snow
East Entrance 35 23 25 3 38 OC W@5mph / lite snow
Grant Village 30 16 17 3 46 OC Windy / snowing
Lake 34 17 19 5 44 BC Lite snow
Lamar 37 21 25 3.5 29 OC W@4-7mph
Madison 28 14 19 6 34 OC Calm / snowing
Mammoth 39 24 28 2 22 BC N@6-9mph
Old Faithful 27 18 27 T 28 SC WNW@7mph / gust 13mph
Snake River 27 12 19 4 50 OC Calm
Tower 39 21 25 5.8 32 SC Calm
West Entrance 36 12 19 4 39 OC Calm / snowing
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 Good STR
Mammoth to Tower YR Good 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 05 February 2011
by the National Weather Service Riverton, WY

Today...Breezy...snow. Snow accumulation of 2 to 3 inches. Total snow accumulation 3 to 6 inches. Highs 21°F to 27°F. Northwest winds 15 to 25 mph. Chance of snow near 100 percent.

Tonight...Cloudy with a 50 percent chance of snow. Lows 5°F to 11°F. West winds around 15 mph.

Sunday...Breezy. Snow likely. Snow accumulation around 2 inches. Highs 17°F to 23°F. West winds 15 to 20 mph. Chance of snow 60 percent.

Sunday Night...Breezy. Snow in the evening...then snow likely after midnight. Snow accumulation of 3 to 4 inches. Lows 8°F to 14°F. Southwest winds 15 to 20 mph. Chance of snow 80 percent.

Monday...Breezy...snow. Snow accumulation of 3 to 4 inches. Total snow accumulation 8 to 10 inches. Highs 21°F to 27°F. West winds 15 to 20 mph. Chance of snow 80 percent.

Monday Night...Colder. Mostly cloudy with a 50 percent chance of snow. Lows -3°F to -9°F. Wind chill readings -14°F to -24°F.

Tuesday...Partly cloudy with a 20 percent chance of snow. Highs 11°F to 17°F. Lowest wind chill readings -21°F to -31°F in the morning.

Tuesday Night...Colder. Partly cloudy. Lows -8°F to -16°F.

Wednesday...Mostly sunny with a 20 percent chance of snow. Highs 11°F to 17°F.

Wednesday Night...Partly cloudy with a 20 percent chance of snow. Lows -6°F to 0°F.

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

Thursday Night...Mostly cloudy in the evening then becoming partly cloudy. Lows 1°F to 7°F.

Friday...Mostly cloudy. Highs 20°F to 26°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 88 Parker Peak 77
Blackwater 58 Snake River Station 28
Canyon 42 Sylvan Lake 53
Evening Star 74 Sylvan Road 40
Fisher Creek 86 Thumb Divide 45
Grassy Lake 75 Two Ocean Plateau 67
Lewis Lake Divide 71 West Yellowstone 36
Madison Plateau 59 Whiskey Creek 46
Northeast Entrance 36 Wolverine 40

Avalanche Information
from the Gallatin National Forest Avalanche Center - February 05, 2011 - this report is by Eric Knoff

Mountain Weather

A moist Northwest flow has delivered a welcomed shot of snow to southwest Montana. Since yesterday morning, 11 inches of snow has fallen in the mountains around Cooke City; 5-6 inches has fallen in the mountains around Bozeman and Big Sky and 3-4 inches has fallen around West Yellowstone. Winds are blowing out of the West-Northwest at 20-30 mph with ridgetop gusts reaching into the 40s. Temperatures are in the high teens to low 20s and will warm into the mid 30s by this afternoon. Snow will continue through the day with an additional 3-6 inches possible by this evening. Southwest Montana will see a break in the weather tonight, but another round of snow will impact our region Sunday night into Monday.

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:

Mud season usually starts around April or May in Montana, but it seems that it has arrived in early February this year. Yesterday, my partners and I skied near Flathead Pass in the northern Bridger Range and got an unexpected dose of wet weather (rain) and yes - mud; not quite what we were expecting. Fortunately, rain levels stayed below 6,000 feet. We did find stable conditions on upper elevation slopes.

Today, wind loaded slopes will be the primary avalanche concern. Upper elevation slopes favored by West-Northwest winds will be the most likely to produce a slide but mid-elevation, cross loaded slopes may produce avalanches as well. Recently formed wind drifts sitting upon surface hoar, near surface facets, or lower density snow will likely be sensitive to the weight of a skier or rider. Look for visual clues like fat, rounded and pillow like formations that indicate recent wind loading. Visualizing shooting cracks or recent avalanche activity are prime indicators the snowpack is unstable. Avoiding steep, wind loaded slopes today will be the best way to avoid triggering a slide.

A secondary concern is any steep slope with a shallow snowpack. Upper elevation, rocky terrain will be the most likely areas to find weak, faceted snow. Many of these shallow areas may have been weak, but not unstable prior to this latest storm (video). However, the weight of new and windblown snow may be enough to stress these weaker areas into failure. If you are able to push your ski pole to the ground, finding another slope to ride will likely be in your best interest.

Today, continued snow and wind will make human triggered avalanches likely on all wind loaded slopes where the Avalanche Danger is rated CONSIDERABLE. Slopes that have not received a wind load have a MODERATE 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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