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Daily Winter Weather Report

Date: Tuesday - January 25, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 25 -10 14 2.5 44 OC Calm / lite snow
East Entrance 28 -3 22 T 40 BC Calm
Grant Village 24 -2 16 5 48 OC Snowing
Lake 26 -3 17 1 43 OC Calm / lite snow
Lamar         29 OC Calm
Madison 28 -8 12 3 32 OC Calm / lite snow
Mammoth 30 12 23 T 17 OC SW@2.4mph / gust 3mph
Old Faithful 26 12 20 1.5 31 OC Calm
Snake River 31 14 18 T 55 OC Calm
Tower 24 8 16 2 29 OC NW@1-3 / lite snow
West Entrance 19 6 18 1 38 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 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 - Oversnow
Junction to Chief Joseph Hwy CLOSED * CLOSED * CLOSED *
Lake to East Entrance Open - Oversnow
Lake to West Thumb Open - Oversnow
Madison to Old Faithful Open - Oversnow
Madison to West Yellowstone Open - Oversnow
Mammoth to Norris Open Good Oversnow
Norris to Canyon Open Good Oversnow
Norris to Madison Open Good Oversnow
Old Faithful to Grant Open - 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 25 January 2011
by the National Weather Service Riverton, WY

Today...Snow likely. Snow accumulation of 1 to 2 inches. Total snow accumulation 1 to 3 inches. Highs 25°F to 31°F. Southwest winds around 15 mph early in the morning becoming west around 15 mph late in the afternoon. Chance of snow 70 percent.

Tonight...Mostly cloudy in the evening then becoming partly cloudy. A 50 percent chance of snow. Lows 10°F to 16°F.

Wednesday...Partly cloudy. Highs 26°F to 32°F.

Wednesday Night...Partly cloudy. Patchy fog after midnight. Lows 9°F to 15°F.

Thursday...Partly cloudy. Patchy fog in the morning. Highs 28°F to 34°F. Southwest winds around 15 mph in the afternoon.

Thursday Night...Partly cloudy. Lows 11°F to 17°F.

Friday...Mostly cloudy. Highs 28°F to 34°F.

Friday Night...Partly cloudy with a 20 percent chance of snow. Lows 14°F to 20°F.

Saturday...Mostly cloudy with a 20 percent chance of snow. Highs 25°F to 31°F.

Saturday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 8°F to 14°F.

Sunday...Mostly cloudy with a 20 percent chance of snow. Highs 24°F to 30°F.

Sunday Night...Mostly cloudy with a 20 percent chance of snow. Lows 4°F to 12°F.

Monday...Mostly cloudy. Highs 21°F to 27°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 93 Parker Peak 79
Blackwater 62 Snake River Station 33
Canyon 44 Sylvan Lake 59
Evening Star 81 Sylvan Road 45
Fisher Creek 92 Thumb Divide 48
Grassy Lake 82 Two Ocean Plateau 72
Lewis Lake Divide 75 West Yellowstone 38
Madison Plateau 63 Whiskey Creek 50
Northeast Entrance 37 Wolverine 43

Avalanche Information
from the Gallatin National Forest Avalanche Center - January 25, 2011 - this report is by Doug Chabot

Mountain Weather

This is the thirteenth day in a row that we've gotten new snow in our advisory area. Last night all the ski areas picked up 3-4 inches with 2-3 inches falling everywhere else. Winds are blowing westerly at 10-20 mph with temperatures in the low 20s in the north to 10 degrees outside Cooke City. Scattered snowfall this morning will only drop another inch in the mountains. Under mostly cloudy skies winds will blow westerly at 15-25 mph as temperatures warm into the upper 20s.

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:

Last night's snowfall will improve the skiing and riding conditions without spiking the danger. The snowpack is strengthening, even with consistent snowfall. A few small crowns were noted on Cedar Mountain in the northern Madison Range yesterday, but the bigger, deeper slides happened late last week following the biggest snowfalls and strongest winds. These avalanches fell into two categories: either wind-loaded slopes or thinner, faceted snowpacks. One large avalanche on Republic Peak, another on Beaverhead in the southern Madison Range and a slide in the Bridger Range on Hardscrabble were all wind-loaded. Since then, even though a few inches have fallen every day, we're finding activity decreasing as the snowpack adjusts to this load. Even the wind slabs are getting progressively harder to trigger. There are no widespread, prominent weak layers in the snowpack, but that doesn't mean you can get away with reckless behavior. Although natural avalanche activity is unlikely today, it's still possible to trigger a slide on wind-loaded slopes or areas that have thinner, weaker snow. Wind loads will be found near the ridgetops. To find thinner areas, try and poke a ski pole to the ground or step off your machine to see if you sink through the snowpack; faceted, sugary, weak snow is unsupportable.

Given these stability concerns, the Avalanche Danger is rated MODERATE on all slopes today.

If you have been backcountry skiing all winter you may have noticed that since the New Year, the snowpack has slowly developed more facets on its lower half. Our snowpits show the top half consisting of new, decomposing stellar crystals with the bottom half sitting on mixed forms—snow crystals that are mildly faceted. Unlike the sugary consistency of well developed facets, the faceting on these mixed forms are subtle and sometimes require a hand lens to see. Facet is an ugly word which typically is synonymous with avalanche activity. But so far this year, this lower layer is dense, not reacting in our stability tests and only produced isolated avalanche activity even after large snowfalls. This is the strongest snowpack I've seen in three years. It's refreshing not being gripped on every slope, every day.

If you have any snowpack or avalanche observations, drop them a line at or call: 406-587-6984.

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

For detailed Avalanche Terms utilized here, please see the Avalanche Glossary.

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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