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Daily Winter Weather Report

Date: Sunday - February 13, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 32 13 25 0 42 BC 20mph winds / gust 40mph
East Entrance 40 21 36 0 36 SC W@15-20mph
Grant Village 37 26 35 T 45 BC Calm
Lake 34 7 28 0 42 OC W@15-20mph
Lamar 41 21 34 T 28 BC Calm
Madison 46 24 36 0 32 BC Calm
Mammoth 38 28 33 0 17 BC SW@12-18mph
Old Faithful 36 27 34 0 29 SC WSW@6mph / gust 9mph
Snake River 41 9 36 0 50 BC W@15-20mph
Tower 39 14 36 0 28 BC W@15-20mph
West Entrance 40 24 40 T 37 SC 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 Good Oversnow
Firehole Canyon Drive Open - Oversnow - Snowcoaches only in the morning
Grant to South Entrance Open Poor 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 Poor Oversnow
Norris to Canyon Open Poor Oversnow
Norris to Madison Open - 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 February 13, 2011
by the National Weather Service Riverton, WY

Rest Of Today...Breezy. Mostly cloudy. Highs 29°F to 35°F. Southwest winds 20 to 25 mph with gusts to around 40 mph.

Tonight...Breezy. Mostly cloudy with isolated snow showers. Lows 13°F to 19°F. Southwest winds 15 to 20 mph. Chance of snow 20 percent.

Monday...Breezy. Mostly sunny in the morning then becoming partly cloudy. Highs 34°F to 40°F. Southwest winds 15 to 20 mph.

Monday Night...Breezy. Mostly cloudy with a 20 percent chance of snow. Lows 18°F to 24°F. Southwest winds 15 to 25 mph.

Tuesday...Breezy. Mostly cloudy. Slight chance of snow in the morning...then chance of rain and slight chance of snow in the afternoon. Highs 33°F to 39°F. Southwest winds 15 to 25 mph. Chance of precipitation 30 percent.

Tuesday Night...Breezy. Partly cloudy in the evening then becoming mostly cloudy. A 40 percent chance of snow. Lows 19°F to 25°F.

Wednesday...Mostly cloudy. Chance of snow in the morning...then chance of snow and rain in the afternoon. Highs 31°F to 37°F. Chance of precipitation 50 percent.

Wednesday Night...Mostly cloudy with a 50 percent chance of snow. Lows 18°F to 24°F.

Thursday...Mostly cloudy with a 50 percent chance of snow. Highs 22°F to 28°F.

Thursday Night...Colder. Mostly cloudy with a 50 percent chance of snow. Lows 3°F to 9°F.

Friday...Mostly cloudy with a 30 percent chance of snow. Highs 18°F to 24°F.

Friday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 0°F to 6°F.

Saturday...Partly cloudy with a 20 percent chance of snow. 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 92 Parker Peak 80
Blackwater 60 Snake River Station 28
Canyon 46 Sylvan Lake 57
Evening Star 75 Sylvan Road 43
Fisher Creek 93 Thumb Divide 48
Grassy Lake 81 Two Ocean Plateau 70
Lewis Lake Divide 75 West Yellowstone 38
Madison Plateau 60 Whiskey Creek 48
Northeast Entrance 36 Wolverine 40

Avalanche Information
from the Gallatin National Forest Avalanche Center - February 13, 2011 - this report is by Eric Knoff

Mountain Weather

Freight train winds have been the main weather event over the past 24 hours. Currently, winds are cranking out of the West-South-West at 30-40 mph with gusts reaching over 50 mph in most mountain locations. Temperatures are in the mid 20s to low 30s Fahrenheit and will rise into the 40s by this afternoon. Skies will be partly cloudy today and winds will gradually decrease by this evening.

Snowpack and Avalanche Discussion:

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

The old saying 'If you don't like the weather in Montana wait 5 minutes' seems to be more accurate than ever. Temperatures have fluctuated wildly; ranging from well below zero this past Wednesday to near fifty degrees above zero yesterday. The one common element that has tied the last few days together is WIND!

Strong winds and fresh snow have created ideal conditions for snow transport and wind loading. Yesterday, multiple natural avalanches were observed around Cooke City; all resulting from a heavy wind load. Although these slides were confined to the new snow and not propagating long distances, they were large in number.

The mountains around West Yellowstone have received less snow over the past week, but a widespread weak layer buried 10-12 inches below the surface will make wind loaded slopes sensitive to the weight of a skier or rider.

The mountains around Bozeman and Big Sky also have a buried weak layer which is being stressed by recent wind loading. Yesterday, a snowmobiler triggered a small wind slab in the second Yellowmule off Buck Ridge. This slide was not large in nature, but similar slides could have dire consequences if triggered in steeper more exposed terrain. Today, the primary avalanche concern is wind slabs that may be resting over a layer of small grained facets. This layer is not present on every slope, but is widespread enough to warrant a major heads up.

Today, the Avalanche Danger is rated CONSIDERABLE on all wind loaded slopes. 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.

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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