Yellowstone Up Close and Personal Logo © Copyright Page Makers, LLC
Yellowstone Up Close and Personal Grizzly Logo © Copyright Page Makers, LLC

Daily Winter Weather Report

Date: Sunday - January 16, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 28 23 25 2 39 OC Calm / lite snow
East Entrance 34 28 30 4 34 OC Calm / moderate snow
Grant Village 28 23 25 2 44 OC Calm
Lake 30 25 30 T 37 OC N@7mph
Lamar 32 24 30 0 24 OC Calm
Madison 34 26 31 0 26 OC Calm
Mammoth 37 29 34 0 17 OC S@5-7mph
Old Faithful 31 27 28 2 30 OC WNW@6mph / snowing
Snake River 35 30 34 T 44 OC Calm
Tower 36 22 29 T 23 OC Calm / lite snow
West Entrance 33 29 33 T 36 BC 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 - Blowing / Drifting
Tower to NE Entrance YR Good STR - Blowing / Drifting
Beartooth Highway CLOSED * CLOSED * CLOSED *
Canyon to Lake Open Poor 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 Poor Sylvan Pass is * CLOSED *
Lake to West Thumb Open Fair Oversnow
Madison to Old Faithful Open Fair Oversnow
Madison to West Yellowstone Open Good Oversnow
Mammoth to Norris Open Fair Oversnow
Norris to Canyon Open Good Oversnow
Norris to Madison Open Good Oversnow
Old Faithful to Grant Open Fair Oversnow

YR=Year Round / NR=No Restrictions / STA=Snow Tires Advised / STR=Snow Tires Required

* Sylvan Pass is temporarily CLOSED to ALL oversnow travel due to Avalanche Danger.


# 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 16 January 2011 by the NWS Riverton, WY

Today...Breezy...snow. Snow accumulation of 2 to 5 inches. Highs 31°F to 37°F. Southwest winds 15 to 25 mph. Chance of snow near 100 percent.

Tonight...Breezy. Snow with rain likely in the evening...then snow after midnight. Areas of blowing snow through the night. Snow accumulation of 1 to 4 inches. Lows 24°F to 30°F. Southwest winds 15 to 25 mph. Chance of precipitation 80 percent.

Monday / Martin Luther King Jr Day...Breezy. Areas of blowing snow in the morning. Snow. Snow accumulation of 2 to 3 inches. Highs 29°F to 35°F. West winds 15 to 20 mph. Chance of snow 80 percent.

Monday Night...Breezy...colder. Snow likely. Snow accumulation of 1 to 3 inches. Total snow accumulation 6 to 16 inches. Lows 17°F to 23°F. West winds 15 to 20 mph. Chance of snow 60 percent.

Tuesday...Cloudy with a 50 percent chance of snow. Highs 25°F to 31°F. Southwest winds around 15 mph in the afternoon.

Tuesday Night...Cloudy with a 50 percent chance of snow. Lows 13°F to 19°F.

Wednesday...Mostly cloudy with a 40 percent chance of snow. Highs 19°F to 25°F.

Wednesday Night...Colder. Partly cloudy with a 20 percent chance of snow. Lows 2°F to 8°F.

Thursday...Patchy fog in the morning. Mostly cloudy with a 20 percent chance of snow. Highs 19°F to 25°F.

Thursday Night...Mostly cloudy with a 20 percent chance of snow. Patchy fog after midnight. Lows 6°F to 12°F.

Friday...Patchy fog in the morning. Mostly cloudy with a 30 percent chance of snow. Highs 23°F to 29°F.

Friday Night...Mostly cloudy with a 30 percent chance of snow. Lows 7°F to 13°F.

Saturday...Mostly cloudy in the morning then becoming partly cloudy. A 30 percent chance of snow. Highs 23°F to 29°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 83 Snake River Station 27
Blackwater 52 Sylvan Lake 50
Canyon 38 Sylvan Road 36
Evening Star 68 Thumb Divide 43
Grassy Lake 72 Two Ocean Plateau 62
Lewis Lake Divide 70 West Yellowstone 34
Madison Plateau 56 Whiskey Creek 44
Parker Peak 66 Wolverine 33

Avalanche Information - from the Gallatin National Forest Avalanche Center this report is by Eric Knoff

Mountain Weather:

Warm, wet weather has parked it over southwest Montana producing valley rain and mountain snow. Since yesterday morning, 5-6 inches of heavy snow has fallen in the mountains around Cooke City totaling a half inch of water. The mountains around West Yellowstone have picked up 3-4 inches while the mountains around Big Ski and Bozeman have picked up 1-2 inches. Currently, temperatures are in the mid to high 20s Fahrenheit and winds are blowing out of the Westsouthwest at 15-30 mph with gust in Hyalite reaching 45 mph (Hyalite Weather Station). Today, more snow is expected with an additional 3-6 inches falling in the mountains around West Yellowstone and Cooke City, while 2-3 inches will accumulate in the mountains around Big Sky and Bozeman. Winds will stay strong out of the Westsouthwest and mountain temperatures will climb into the 30s Fahrenheit. An unsettled weather pattern will continue through tomorrow.

Snowpack and Avalanche Discussion:

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

The southern Ranges have received a healthy shot of snow over the past few days. This latest round of snow has been accompanied by strong WSW winds, which have developed thick, cohesive slabs on leeward slopes. Yesterday, an observer in Cooke City noted deep snow on Henderson Bench as well as substantial wind loading in the Rasta Chutes new Lulu Pass.

Although a well structured snowpack has produced a generally stable foundation for this new load, a few issues need to be addressed. First, warm weather has developed a dense layer of snow near the surface that now rests upon a less dense layer 10-12 inches down. Mark and I found this to be our main stability concern in Bacon Rind yesterday. This upside down type of instability doesn't last long and shouldn't produce avalanches that fracture over huge areas, however, this has the potential to be a problematic recipe as the snowpack tries to adjust, especially in areas that have received heavy deposits of wind drifted snow. Second, new snow and wind throughout the day will continue to add stress to the snowpack. Backcountry travelers should pay close attention to changing conditions and avoid steep slopes and avalanche run out zones if the snow continues to pile up.

Today, human triggered avalanches are likely on all wind loaded slopes where the Avalanche Danger is rated CONSIDERABLE. Slopes steeper than 35 degrees without a wind load have a MODERATE Avalanche Danger, and slopes less than 35 degrees without a wind load have a LOW Avalanche Danger.

The northern Madison Range:

A buried layer of surface hoar 2-3 feet deep continues to separate the northern Madison Range apart from the rest of our advisory area. This pesky layer has become less active over time, but continues to carry the potential for producing avalanches. Frequent snowpack evaluations are the best way to determine the strength and distribution of this layer. This is not always straight forward since this surface hoar layer is intermittent.

For this reason, extra caution on slopes steeper than 35 and/or wind loaded slopes is warranted in this area.

In addition to the buried surface hoar factor, strong Westsouthwest winds over the past few days have scoured some slopes and loaded others. Although warm temperatures have helped stabilize wind loaded slopes, the possibility of triggering a wind slab is not out of the question. As more snow and wind arrive today with the next system, the odds of triggering a wind slab avalanche will increase.

For today, human triggered avalanches are possible in the northern Madison range and the Avalanche Danger is rated MODERATE.

The Bridger Range and northern Gallatin Range:

The northern ranges have received only an inch or two of new snow over the past few days. This lack of precipitation has kept the avalanche danger from rapidly increasing. One component that has affected these areas is strong WSW winds. Yesterday, a skier north of Bridger Bowl reported stiff, punchy wind slabs along the ridgelines, which produced tricky skiing conditions. In some areas these thick, cohesive slabs rest over weak faceted snow that formed during periods of cold weather. These slabs have the potential to fail under the weight of a skier or rider creating heightened avalanche conditions in wind loaded terrain.

For today, a MODERATE Avalanche Danger exists on all wind loaded slopes or slopes steeper than 35 degrees. A LOW Avalanche Danger exist on less steep slopes without a wind load.

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

~ Mammoth Weather Forecast ~

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

Yellowstone National Park by Page Makers, LLC © Copyright All Rights Reserved
I n d e x
Accessibility Earthquakes Maps Video Page
Address Email Newspaper Visitor Centers
Adult Programs Entrances Old Faithful Live WebCam Visitor Stats
Amphibians Entrance Fees Pets Volcano Observatory
Animals Fall Closure Phone Numbers Waterfalls
Backcountry Fish Picnic Areas Weather
Bear Management Fishing Fees Ranger Led Activities WebCams
Bear Sightings Fishing Regulations Reptiles Wildflowers
Biking Getting Here Reunions Winter Closing
Boating Hiking Rivers, Creeks & Streams Winter Opening
Books History Roads Winter Weather Reports
Butterflies Junior Ranger Program Schedule Wolf Project
Camping Lakes Search Page Wolf Sightings
Campground Maps Location Spring Opening Wolverine Help
Challenges Lodging Star Talks Yellowstone ~ the Name
Chat Page Lynx Help Trip Planner pdf Young Scientist
Clinics / Medical Mammal List Trip Reports Youth Conservation Corps
Not all who wander are lost by John Ronald Reuel Tolkien © Page Makers, LLC
Yellowstone National Park WebCams
Old Faithful Live All Old Faithful Old Faithful Static Old Faithful VC North Entrance Mt Washburn Mammoth YVO WebCam

Yellowstone Area Highway WebCams
Alpine Junction Hwy 89 (South) Monida Pass I-15 (North)
Bozeman Pass I-90 (North) Osborne Bridge Hwy 20 (West)
Henry's Lake North Hwy 20 (West) Raynolds Pass MT 87 (North or West)
Henry's Lake South Hwy 20 (West) Teton Pass WY 22 (South)
(North) = Closest Entrance to Yellowstone National Park.

State Road Reports
Idaho Utah
Montana Wyoming

Entrance Cities and Gateway Towns
Gardiner, Montana Silver Gate, Montana West Yellowstone, Montana Cooke City, Montana
Livingston, Montana Cody, Wyoming Jackson Hole, Wyoming Yellowstone National Park

The Great Outdoors Net Great Outdoor Recreational Places
Gardiner, Montana World Humanity

Contact Us

by John William Uhler

Back to: Yellowstone Up Close and Personal

Copyright © 1995 - 2014 Page Makers, LLC and Yellowstone Media ~ All Rights Reserved