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Daily Winter Weather Report

Date: Thursday - March 03, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 33 -5 24 1 46 OC Breezy
East Entrance 41 1 27 1 40 OC Calm / snowing
Grant Village 34 -1 24 2 55 OC Windy
Lake 36 3 27 .5 48 OC Calm
Lamar 40 6 31 0 29 BC Calm
Madison 36 22 26 T 34 SC Calm
Mammoth 39 32 37 0 17 OC SSW@16mph / gust 21mph
Old Faithful 37 8 30 1 37 OC Calm / snowing
Pahaska 45 30 35 0 40 OC Calm
Snake River 40 -3 29 6 57 OC Calm / snowing
Soda Butte 40 28 33 T 23 OC Calm
Thumb Divide 37 27 31 T 56 OC Calm
Tower 42 5 27 T 31 BC N@4-6mph
West Entrance 36 1 30 .5 47 OC Breezy / lite snow
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 03, 2011
by the National Weather Service Riverton, WY

Rest Of Today...Snow likely late in the morning...then numerous snow showers in the afternoon. New snow accumulation of 1 to 2 inches. Total snow accumulation 2 to 4 inches. Highs 29°F to 35°F. West winds around 15 mph. Chance of snow 70 percent.

Tonight...Cloudy with scattered snow showers. Lows 13°F to 19°F. Chance of snow 50 percent.

Friday...Cloudy with scattered snow showers. Highs 20°F to 26°F. Chance of snow 50 percent.

Friday Night...Mostly cloudy. Slight chance of snow in the evening...then chance of snow after midnight. Lows 7°F to 13°F. Chance of snow 40 percent.

Saturday...Cloudy with a 50 percent chance of snow. Highs 24°F to 30°F.

Saturday Night...Cloudy with a 50 percent chance of snow. Lows 14°F to 20°F.

Sunday...Snow likely. Light snow accumulations. Highs 28°F to 34°F. Chance of snow 70 percent.

Sunday Night...Snow likely. Light snow accumulations. Lows 9°F to 15°F. Chance of snow 60 percent.

Monday...Cloudy with a 40 percent chance of snow. Highs 27°F to 33°F.

Monday Night...Cloudy with a 30 percent chance of snow. Lows 3°F to 9°F.

Tuesday...Mostly cloudy with a 20 percent chance of snow. Highs 18°F to 24°F.

Tuesday Night...Mostly cloudy with a 20 percent chance of snow. Lows -1°F to 5°F.

Wednesday...Mostly cloudy with a 20 percent chance of snow. Highs 22 to 28.

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 107 Parker Peak 78
Blackwater 62 Snake River Station -
Canyon 49 Sylvan Lake 61
Evening Star 78 Sylvan Road 47
Fisher Creek 96 Thumb Divide 56
Grassy Lake 92 Two Ocean Plateau -
Lewis Lake Divide 87 West Yellowstone 45
Madison Plateau 73 Whiskey Creek 56
Northeast Entrance 40 Wolverine 38

Avalanche Information
from the Gallatin National Forest Avalanche Center - March 03, 2011 - this report is by Mark Staples. This advisory does not apply to operating ski areas.

Mountain Weather

The mountains near Big Sky, West Yellowstone, and Cooke City received 1 to 2 inches of snow since yesterday. This morning temperatures were near 20°F and winds were blowing 15-20 mph from the WestSouthWest. More snow should fall today. High temperatures will be near 30°F and winds will continue unchanged. By tomorrow morning most areas will receive 3 to 5 inches.

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 last significant snowfall was 10 days ago. Since then, snow has trickled into the advisory area with brief periods of clear weather but continued strong West and Southwest winds. This weather means 3 things:

1. Without extended periods of clear weather, no prominent weak layers have formed. Some facets can be found near the snow surface, mostly on South aspects, but these are rare and/or not developed enough to be a concern.

2. Light and sporadic snowfall has not stressed the snowpack.

3. Most slopes were either scoured or have stiff wind slabs on them, and the surface snow will develop a good bond with snow falling today.

Hard wind slabs are the main concern. Recent warm temperatures and a lack of stress from snowfall helped these wind slabs bond. Most will not produce human triggered avalanches but some could. The few slopes untouched by wind will have soft snow and a strong snowpack like I found on Mount Ellis yesterday in the North Gallatin Range. A secondary concern - monster cornices exist on many ridgelines. They can break where and when you least expect. Watch for them when walking on ridges or parked in the fall line below them because falling cornices make great triggers for avalanches.

The snowpack is generally strong and deep and lacks reactive weak layers. One exception - very isolated slopes have facets near an ice crust about 2 feet deep. This layering produced a human triggered avalanche near Cooke City on Sunday. In Hyalite Canyon, a similar layering was found 2 weeks ago but has become unreactive in stability tests and not produced avalanches recently.

For today, the Avalanche Danger is rated MODERATE on wind-loaded slopes that are steeper than 35 degrees. All other slopes have a LOW Avalanche Danger. A LOW danger ≠ NO 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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