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Daily Winter Weather Report

Date: Sunday - January 30, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 33 12 18 .5 42 OC Calm / lite snow
East Entrance 43 14 22 T 36 OC Calm / lite snow
Grant Village 37 21 37 0 46 BC Calm
Lake 31 18 31 T 42 BC Calm
Lamar 36 10 28 0 28 OC Calm / lite snow
Madison 42 21 42 0 30 BC Calm
Mammoth 42 22 22 0 18 OC NE@1-3mph
Old Faithful 35 14 23 0 29 OC S@3.3mph / gust 6.5mph
Snake River 16 3 7 0 53 OC Calm
Tower 37 13 29 0 27 OC NNE@1.9mph / gust 3.3mph
West Entrance 36 24 36 T 36 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 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 30 January 2011
by the National Weather Service Riverton, WY

Rest Of Today...Snow likely. New snow accumulation around 1 inch. Highs 27°F to 33°F. Chance of snow 70 percent.

Tonight...Snow likely. Snow accumulation of 1 to 2 inches. Lows 6°F to 12°F. Chance of snow 70 percent.

Monday...Colder. Snow likely in the morning...then chance of snow in the afternoon. Snow accumulation around 1 inch. Total snow accumulation 3 to 4 inches. Highs 6°F to 12°F. North winds around 15 mph late in the afternoon. Chance of snow 70 percent.

Monday Night...Much colder. Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows -13°F to -21°F. Northeast winds around 15 mph. Lowest wind chill readings -31°F to -41°F in the late evening and overnight.

Tuesday...Partly cloudy with a 20 percent chance of snow. Highs -3°F to 3°F. Northeast winds around 15 mph in the morning. Lowest wind chill readings -32°F to -42°F early in the morning.

Tuesday Night...Mostly clear. Lows -11°F to -17°F. Wind chill readings -26°F to -36°F.

Wednesday...Not as cold. Partly cloudy. Highs 15°F to 21°F. Lowest wind chill readings -21°F to -31°F in the morning.

Wednesday Night...Not as cold. Partly cloudy. Lows -3°F to 3°F.

Thursday...Not as cold. Partly cloudy. Highs 23°F to 29°F.

Thursday Night...Partly cloudy. Lows 6°F to 12°F.

Friday...Partly cloudy with a 20 percent chance of snow. Highs 26°F to 32°F.

Friday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 10°F to 16°F.

Saturday...Mostly cloudy with a 30 percent chance of snow. Highs 22°F to 28°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 87 Parker Peak 76
Blackwater 58 Snake River Station 34
Canyon 42 Sylvan Lake 54
Evening Star 75 Sylvan Road 40
Fisher Creek 83 Thumb Divide 46
Grassy Lake 77 Two Ocean Plateau 68
Lewis Lake Divide 72 West Yellowstone 35
Madison Plateau 57 Whiskey Creek 47
Northeast Entrance 33 Wolverine 38

Avalanche Information
from the Gallatin National Forest Avalanche Center - January 30, 2011 - this report is by Eric Knoff

Mountain Weather

Cooler temperatures have started to move into southwest Montana, but they have forgotten the snow. Currently, mountain temperatures are ranging from the mid teens to low 20s and winds are blowing out of the West-South-West at 10-20 mph. An approaching cold front will enter our area by early afternoon, dropping temperatures significantly through the later part of the day. Snow will likely arrive with this front, delivering 3-5 inches to the mountains by tomorrow morning. Temperatures will plummet well below zero tonight and will struggle to reach double digits above zero tomorrow.

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:

Warm and dry conditions over the past few days have helped stabilize the snowpack on most slopes. Yesterday, I nearly forgot what month it was when I was hiking around the Bridger Range in a light fleece top; it felt far more like April than January. Although weak and unstable snow can be found in a few scattered areas, this is the exception to the rule.

The avalanche activity over the past week, however, has provided a reminder that even amidst generally stable conditions surprising avalanche events can still occur. Slides in the Bridger and Madison ranges have provided valuable information about the specific instabilities that the snowpack still holds. Recent avalanches have not been confined to specific aspects or elevations and they have shared a similar theme - weak, faceted snow near the ground fighting to support heavy loads. Today, the main area of concern is high elevation alpine terrain, where stiff wind slabs could be sitting on weak, faceted snow, which may be sensitive to the weight of a skier or rider. Although recent slides have not been propagating over wide areas, meaning the weak layer is not widespread, they have been running long distances, making them quite dangerous. If you are seeking adventure in alpine terrain, use extra caution on steep slopes that have been previously wind affected.

A secondary concern is weak snow forming on the surface. An observer in Cooke City has found a large crop of surface hoar growing on most aspects and elevations. He also mentioned a facet-crust combination forming on South-South-East facing slopes. Although we have not received numerous reports about growing surface hoar, I would not be surprised if this pesky layer becomes an increasing problem over the next week. If new snow does arrive, pay close attention to wind loaded slopes and slopes steeper than 35 degrees.

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

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. Click Here 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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