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Daily Winter Weather Report

Date: Tuesday - January 18, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 31 17 20 1 39 OC Calm
East Entrance 35 26 28 2 38 OC W@10mph
Grant Village 33 23 23 T 44 OC Calm
Lake 33 17 24 .5 40 OC W@8mph / gust 17mph
Lamar 40 24 28 4 26 OC W@4-7mph
Madison 36 21 24 0 26 OC Calm
Mammoth 41 26 29 T 17 OC S@2-3mph
Old Faithful 32 20 22 1 29 OC NE@3-5mph / lite snow
Snake River 37 27 28 T 44 OC Calm
Tower 39 23 29 T 23 OC N@5-7mph
West Entrance 36 25 28 0 36 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 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 Open Fair / Poor Oversnow
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 Fair 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


# 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 18 January 2011
by the National Weather Service Riverton, WY

Today...Breezy. Cloudy with a 50 percent chance of snow. Highs 24°F to 30°F. Southwest winds 15 to 20 mph.

Tonight...Breezy...snow. Snow accumulation of 3 to 6 inches. Lows 11°F to 17°F. Southwest winds 15 to 20 mph until early morning. Chance of snow near 100 percent.

Wednesday...Mostly cloudy. Snow likely in the morning...then chance of snow in the afternoon. Snow accumulation of 1 to 2 inches. Total snow accumulation 4 to 8 inches. Highs 19°F to 25°F. North winds around 15 mph in the morning. Chance of snow 70 percent.

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

Thursday...Mostly cloudy. A 20 percent chance of snow in the afternoon. Highs 16°F to 22°F.

Thursday Night...Mostly cloudy with a 40 percent chance of snow. Lows 9°F to 15°F.

Friday...Not as cold. Mostly cloudy with a 30 percent chance of snow. Highs 24°F to 30°F.

Friday Night...Snow likely. Moderate snow accumulations. Lows 14°F to 20°F. Chance of snow 60 percent.

Saturday...Cloudy with a 50 percent chance of snow. Highs 24°F to 30°F.

Saturday Night...Colder. Mostly cloudy with a 20 percent chance of snow. Lows 6°F to 12°F.

Sunday...Mostly cloudy in the morning then becoming partly cloudy. A 20 percent chance of snow. Highs 22°F to 28°F.

Sunday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 4°F to 10°F.

Monday...Mostly cloudy with a 20 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 89 Parker Peak 70
Blackwater 56 Snake River Station 35
Canyon 40 Sylvan Lake 54
Evening Star 76 Sylvan Road 40
Fisher Creek 84 Thumb Divide 44
Grassy Lake 79 Two Ocean Plateau 68
Lewis Lake Divide 75 West Yellowstone 35
Madison Plateau 61 Whiskey Creek 47
Northeast Entrance 32 Wolverine 38

Avalanche Information
from the Gallatin National Forest Avalanche Center - this report is by Doug Chabot

Mountain Weather

The mountains picked up more snow yesterday. Cooke City got the most with 6-8 inches while West Yellowstone got the least with 2 inches; 3-4 inches fell everywhere else. Ridgetop winds averaged 25-30 mph with gusts exceeding 40 mph. Temperatures have cooled into the teens from the low 30s yesterday morning. Clouds will increase today as winds remain steady at 20-30 mph out of the west to north. Another moist system will bring snowfall tonight blanketing us with 3-6 inches of new snow by morning.

Snowpack and Avalanche Discussion:

The mountains around Cooke City and the Washburn Range:

The mountains around Cooke City have been the clear winner with almost three feet (2.4 inches Snow Water Equivalent) of new snow in the last 72 hours. Wind drifts made backcountry travel difficult yesterday. The Gallatin National Forest Snow Rangers couldn't even break trail on their sleds to Daisy Pass because of the deep snow. On Sunday, skiers triggered a wind slab near Lulu Pass.

With even more snow and strong west to northwest winds, I'm betting that there are many natural avalanches on wind-loaded slopes today which have a HIGH Avalanche Danger. All other slopes have a CONSIDERABLE Avalanche Danger.

The Bridger, Madison and Gallatin Ranges including the Lionhead area near West Yellowstone:

Since Saturday evening about 6-8 inches has fallen in the northern mountains with 12-14 inches accumulating down south. Over the last six weeks we've been very concerned with a buried surface hoar layer near Big Sky, but we've been tracking it closely and watched it gain strength. I dug four pits on Sunday looking for it, and although I could still barely see it in the pit wall, it would not fracture in any of my stability tests. If it does exist, it'll be on small, isolated slopes. The snowpack is no longer like punished child standing alone in a corner separated from everyone else; it's finally behaving.

There are two stability issues to watch out for. The first, and most obvious, is wind-loaded slopes which could be easily triggered. The second, more subtle issue is slopes with a thin snowpack. We are finding that snows less than three feet deep have gotten weaker and more unstable as facets near the ground have lost strength and cohesion. We have found this in Beehive Basin and in the Bridger Range on a few west facing slopes as well as Argentina Bowl near Saddle Peak. Skiers reported finding this up Hyalite and also in the southern Madison Range. A thin snowpack is often comprised of sugary, weak facets and will not support new snow very well.

For today, the Avalanche Danger on all wind-loaded terrain is CONSIDERABLE. All other slopes 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.

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

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