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Daily Winter Weather Report

Date: Thursday - January 27, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 26 14 15 T 43 OC Calm
East Entrance 34 4 16 0 37   Calm / Clear
Grant Village 29 17 22 0 46 OC Calm
Lake 31 14 18 0 44 BC Calm
Lamar 33 11 15 0 29 OC Calm
Madison 34 12 17 0 31 OC Calm
Mammoth 32 21 26 0 17 OC SSE@5.5mph / gust 9.8mph
Old Faithful 27 10 18 0 30 OC SSE@1.2mph / gust 3.8mph
Snake River 23 19 21 T 53 OC Calm
Tower 29 7 20 0 28 OC Calm
West Entrance 24 19 19 0 37 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 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 27 January 2011
by the National Weather Service Riverton, WY

Today...Mostly cloudy. A 20 percent chance of snow in the morning. Highs 28°F to 34°F.

Tonight...Mostly cloudy in the evening then becoming partly cloudy. Lows 14°F to 20°F. Southwest winds around 15 mph early in the morning.

Friday...Mostly cloudy. Highs 30°F to 36°F. Southwest winds around 15 mph early in the morning.

Friday Night...Partly cloudy with a 20 percent chance of snow. Lows 13°F to 19°F. Southwest winds around 15 mph.

Saturday...Mostly cloudy with a 20 percent chance of snow. Highs 27°F to 33°F.

Saturday Night...Mostly cloudy with a 30 percent chance of snow. Lows 14°F to 20°F.

Sunday...Mostly cloudy with a 50 percent chance of snow. Highs 23°F to 29°F.

Sunday Night...Colder. Partly cloudy with a 40 percent chance of snow. Lows -2°F to 4°F.

Monday...Partly cloudy with a 20 percent chance of snow. Highs 18°F to 24°F.

Monday Night...Partly cloudy with a 20 percent chance of snow. Lows -3°F to 5°F.

Tuesday...Partly cloudy. Highs 19°F to 25°F.

Tuesday Night...Partly cloudy in the evening then clearing. Lows 0°F to 8°F.

Wednesday...Partly cloudy in the morning then clearing. 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 89 Parker Peak 78
Blackwater 60 Snake River Station 34
Canyon 44 Sylvan Lake 55
Evening Star 78 Sylvan Road 41
Fisher Creek 88 Thumb Divide 46
Grassy Lake 81 Two Ocean Plateau 69
Lewis Lake Divide 75 West Yellowstone 35
Madison Plateau 60 Whiskey Creek 48
Northeast Entrance 36 Wolverine 39

Avalanche Information
from the Gallatin National Forest Avalanche Center - January 27, 2011 - this report is by Mark Staples

Mountain Weather

A ridge of high pressure is the main weather feature today. This morning temperatures were in the mid 20s Fahrenheit and ridgetop winds were blowing 20-40 mph from the West. Near Cooke City and West Yellowstone, winds were calmer with temperatures around 11 degrees Fahrenheit. Today winds should blow 15-30 mph from the West and temperatures will warm into the low 30s Fahrenheit. Near Cooke City and West Yellowstone temperatures will warm into the low 20s Fahrenheit. No new snow is expected for the next couple of days.

Snowpack and Avalanche Discussion:

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

In most places the snowpack is strong and stability assessments are easy. If the snowpack has good stability on a small slope, then it should have good stability on a bigger adjacent slope; however, there are two issues to keep in mind. A slight weakness exist about 12-16 inches deep at an interface between old snow and newer snow. Yesterday in Middle Basin just north of Big Sky, my partner and I found this layer which Doug found in the northern Bridger Range and others found in isolated areas in the northern Gallatin Range. We found it on most aspects, but it seemed most reactive on slopes with some southern exposure. Solar radiation probably helped facet this layer the slightest amount but it wasn't obvious in a high powered hand lens. Another group of skiers in Middle Basin triggered a wind slab resting on this layer and the ski patrol at Big Sky noted shallow but touchy wind slabs on a similar layer. This issue shouldn't be a concern for very long.

The other issue to remember is any area with a thin snowpack (less than 3 or 4 feet). Yesterday as I hunted for a good location to dig a snowpit, I poked my ski pole into the snow and hit the ground. Before digging my snowpit, I knew that I'd find weak snow. Skiers in Hyalite Canyon found a thin and weak snowpack on a West aspect. They retreated from that slope and found another with a snowpack over 6 feet deep that was the strongest snow they've seen all year. Watch for these specific terrain features where either the snowpack is thin or near-surface layers of snow fracture easily. Be careful, some of these thin areas are not obvious.

Today, the Avalanche Danger is rated MODERATE on all slopes steeper than 35 degrees. All other slopes have a LOW Avalanche Danger.

This Friday: Beacon Park Opening Celebration

The Bozeman Recreation Department is celebrating the opening of the Bozeman Beacon Park on Friday, January 28th from 4:00 to 6:00 p.m. at Beall Park, 415 N. Bozeman. The Recreation Department will offer food, refreshments, music, and training on how to use the park with your avalanche beacon. This event is free to the public. For information call 582-2290.

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. Go to for more information and registration forms.

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.

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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