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Daily Winter Weather Report

Date: Friday - March 04, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 36 14 15 3 48 BC Calm
East Entrance 41 1 19 3 42 OC Calm / lite snow
Grant Village 32 5 8 3 58 SC Calm / lite snow
Lake 38 8 14 2 50 BC Calm / lite snow
Lamar 41 15 18 T 28 OC Calm
Madison 41 5 8 2 36 - Calm / clear
Mammoth 43 16 22 3.5 20 OC Calm / clear
Old Faithful 37 5 14 1 37 OC Calm
Pahaska 42 16 22 T 40 OC Calm
Snake River 36 10 23 2 59 OC Calm / lite snow
Soda Butte 41 15 20 T 22 OC Calm
Thumb Divide 34 11 20 0 56 OC Calm
Tower 43 9 10 3.5 33 SC N@10-12mph
West Entrance 39 15 15 0 46 OC Calm
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 Fair 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 CLOSED * CLOSED * CLOSED *
Lake to West Thumb Open Fair 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 March 04, 2011
by the National Weather Service Riverton, WY

Rest Of Today...Cloudy. Scattered snow showers late in the morning...then chance of snow in the afternoon. Highs 27°F to 33°F. West winds around 15 mph in the afternoon. Chance of snow 50 percent.

Tonight...Mostly cloudy with slight chance of snow in the evening... Then partly cloudy with chance of snow after midnight. Lows 10°F to 16°F. Southwest winds around 15 mph. Chance of snow 30 percent.

Saturday...Breezy. Mostly cloudy. Chance of snow in the morning... Then snow likely in the afternoon. Snow accumulation around 2 inches. Highs 27°F to 33°F. Southwest winds 15 to 20 mph. Chance of snow 70 percent.

Saturday Night...Breezy. Cloudy with a 50 percent chance of snow. Lows 13°F to 19°F. Southwest winds 15 to 20 mph.

Sunday...Snow likely. Snow accumulation of 2 to 3 inches. Highs 29°F to 35°F. Chance of snow 70 percent.

Sunday Night...Snow likely. Moderate snow accumulations. Lows 10°F to 16°F. Chance of snow 60 percent.

Monday...Snow likely. Light snow accumulations. Highs 29°F to 35°F. Chance of snow 60 percent.

Monday Night...Cloudy with a 30 percent chance of snow. Lows 5°F to 11°F.

Tuesday...Mostly cloudy in the morning then becoming partly cloudy. A 20 percent chance of snow. Highs 23°F to 29°F.

Tuesday Night...Partly cloudy with a 20 percent chance of snow. Lows 1°F to 7°F.

Wednesday...Mostly cloudy with isolated snow showers. Highs 24°F to 30°F. Chance of snow 20 percent.

Wednesday Night...Mostly cloudy with isolated snow showers. Lows 8°F to 14°F. Chance of snow 20 percent.

Thursday...Cloudy with a 20 percent chance of snow. Highs 27°F to 33°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 113 Parker Peak 88
Blackwater 67 Snake River Station -
Canyon 53 Sylvan Lake 64
Evening Star 82 Sylvan Road 48
Fisher Creek 103 Thumb Divide 57
Grassy Lake 94 Two Ocean Plateau -
Lewis Lake Divide 89 West Yellowstone 48
Madison Plateau 73 Whiskey Creek 58
Northeast Entrance 45 Wolverine 42

Avalanche Information
from the Gallatin National Forest Avalanche Center - March 04, 2011 - this report is by Mark Staples. This advisory does not apply to operating ski areas.

Mountain Weather

Since yesterday morning the mountains near Cooke City received 6 inches of snow while all other areas received 1 to 3 inches. Yesterday evening westerly winds increased to 20-30 mph but decreased this morning to 10-20 mph. Temperatures this morning were in the low teens Fahrenheit and should warm to the mid 20s Fahrenheit. Today will be mostly cloudy and only a trace of snow might fall by tomorrow morning. Snowfall should resume on Saturday.

Snowpack and Avalanche Discussion:

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

    The current weather pattern is perfect - a few inches of snow everyday with light winds and mostly cloudy skies. This type of weather:

    • Prevents the formation of new persistent weak layers.

    • Limits wind slab formation.

    • Keeps the skiing and riding good without stressing the snowpack.

Avalanche issues in the new snow are minimal. New snow has mostly bonded well to the old snow surface. Some new snow fell as little pellets called graupel which can be a temporary weak layer but usually bonds within 24-48 hrs. Also, a few fresh wind slabs may exist after a few hours of increased westerly winds last night.

Avalanche issues in the old snow primarily involve hard wind slabs that formed last weekend and early this week. Fortunately these hard slabs have mostly bonded and triggering one will be difficult though not impossible. Likely areas to trigger one of these hard slabs are slopes that have been scoured by winds and have a thin and weak snowpack. The Big Sky Ski Patrol triggered a small pocket of old snow with explosives in one of these areas Most of these slopes remain scoured, but a few may have slabs from cross loading winds.

For today, with mostly light winds and no widespread stability concerns, the Avalanche Danger is rated LOW. Generally safe avalanche conditions exist, but watch for unstable snow on isolated terrain features because a LOW Danger ≠ NO Danger.

The mountains around Cooke City and the Washburn Range:

The mountains near Cooke City received 6 inches of new snow. Much of this snow fell as little pellets called graupel that can be a temporary weak layer. Deeper layers of snow are well bonded and human triggered avalanches should be small. One isolated exception – a skier triggered avalanche near Round Lake on Sunday. This avalanche occurred on facets near an ice crust about 2 feet deep. Fortunately this layering does not exist on most slopes.

For today the Avalanche Danger is rated MODERATE on wind loaded slopes. All other slopes have a LOW Avalanche Danger.


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. The results from our survey are posted online. Thanks to all who participated. You can check out the results at

In response to our survey we added a new page to the website with images of our snowpit profiles. This page is under the Resources/Other Info tab at

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

Upcoming Events

SATURDAY - Pinhead Classic

The 30th Annual Pinhead Classic on is Saturday, March 5th. "Gangsters and Flappers" is this year's costume theme, so come dressed up to race, socialize and wind great prizes. Registration is $30 but get you all sorts of cool stuff. All proceeds benefit the Friends of the Avalanche Center. Check out the website for details.

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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