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Daily Winter Weather Report
Date: Monday - 31 December 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Bechler||6.0||3.0||3.0||.09||30.97||OC||Wind gusts @ 2 mph|
|Mammoth||7.7||2.0||2.3||0||6.76||OC||W @ 4 mph|
|Old Faithful||-11.5||-16.9||-15.0||0||8.51||OC||E @ 1 - 2 mph|
|Thorofare||7.0||1.0||1.0||.01||4.05||OC||N @ 1 - 3 mph|
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|Road Section||Status||Conditions||Public Access / Info|
|Gardiner to Mammoth||YR||STR|
|Mammoth to Tower||YR||STR|
|Tower to NE Entrance||YR||STR|
|Beartooth Highway||CLOSED *||CLOSED *||CLOSED *|
|Canyon to Lake||Open||Rubber tracked oversnow concession vehicles|
|Firehole Canyon Drive||CLOSED||CLOSED||CLOSED|
|Grant to South Entrance||Open||Rubber tracked oversnow concession vehicles|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||Open||Rubber tracked oversnow concession vehicles|
|Lake to West Thumb||Open||Rubber tracked oversnow concession vehicles|
|Madison to Old Faithful||Open||Rubber tracked oversnow concession vehicles|
|Madison to West Yellowstone||Open||Rubber tracked oversnow concession vehicles|
|Mammoth to Norris||Open||Rubber tracked oversnow concession vehicles|
|Norris to Canyon||Open||Rubber tracked oversnow concession vehicles|
|Norris to Madison||Open||Rubber tracked oversnow concession vehicles|
|Old Faithful to Grant||Open||Rubber tracked oversnow concession vehicles|
|Tower to Canyon||CLOSED *||CLOSED *||CLOSED *|
YR=Year Round / NR=No Restrictions / STA=Snow Tires Advised / STR=Snow Tires Required
* NOTE: CLOSED FOR THE SEASON.
# 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 ********
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Caution advised for snow falling off of building roofs. Park accordingly.
Dangerous avalanche conditions may already exist in many back country areas, please call the Recorded Avalanche Advisory 406-587-6981 for the most current conditions.
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by the National Weather Service Riverton, WY
Today: Partly cloudy. Scattered flurries in the afternoon. Highs 10°F to 16°F.
Tonight / New Years Eve: Partly cloudy in the evening then becoming mostly cloudy. Scattered flurries through the night. Lows -5°F to 1°F. * Happy New Year *
Tuesday / New Years Day: Partly cloudy. Scattered flurries. Highs 13°F to 19°F. * Happy New Year *
Tuesday Night / New Years Night: Partly cloudy. Scattered flurries. Lows -1°F to -7°F. * Happy New Year *
Wednesday: Mostly sunny in the morning then becoming partly cloudy. Highs 15°F to 21°F.
Wednesday Night: Mostly clear. Lows -5°F to 3°F.
Thursday: Mostly sunny. Highs 22°F to 28°F.
Thursday Night: Mostly clear in the evening...then partly cloudy with a 20 percent chance of snow after midnight. Lows -5°F to 3°F.
Friday: Partly cloudy with a 20 percent chance of snow. Highs 22°F to 28°F.
Friday Night: Partly cloudy with a 20 percent chance of snow. Lows 4°F to 10°F.
Saturday: Partly cloudy with a 20 percent chance of snow. Highs 21°F to 27°F.
Saturday Night: Partly cloudy. Lows 6°F to 12°F.
Sunday: Partly cloudy with a 20 percent chance of snow. Highs 21°F to 27°F.
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|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||72||Parker Peak||44|
|Blackwater||45||Snake River Station||30|
|Evening Star||47||Sylvan Road||21|
|Fisher Creek||62||Thumb Divide||35|
|Grassy Lake||51||Two Ocean Plateau||56|
|Lewis Lake Divide||60||West Yellowstone||18|
|Madison Plateau||48||Whiskey Creek||25|
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from the Gallatin National Forest Avalanche Center - December 31, 2012 - this report is by Eric Knoff. This advisory does not apply to operating ski areas.
Yesterday the Bridger Range picked up 3 to 4 inches of low density snow, all other areas picked up a trace to one inch. Today, weak disturbances imbedded in a northwest flow will produce a slight chance of snow in the northern mountains; the mountains around Cooke City and West Yellowstone will likely remain dry. Currently, temperatures are in the single digits Fahrenheit and winds are blowing 5 to 10 out of the west-northwest with the exception of the Bridger Range where winds are blowing 10 to 25 out of the west-northwest. Today, temperatures will warm into the teens Fahrenheit under partly to mostly cloudy skies and winds will blow 5 to 20 out of the west-northwest. The northern mountains will continue to see a slight chance of snow where 1 to 2 inches is possible by tomorrow morning.
Snowpack and Avalanche Discussion:
The Bridger, Gallatin and Madison Ranges, the Lionhead area near West Yellowstone and Cooke City:
It's time to put 2012 to bed. 2013 will be starting off with a snowpack that's promising, but not perfect. It's a bit like the Vikings making the playoffs - now is the time to be optimistic, but also focused on the challenges ahead. Currently, most of our avalanche concerns lie in the upper layers of the snowpack. Recent bouts of clear and calm weather have formed surface hoar and near surface facets on a variety of slopes. If this quiet weather pattern continues, these weak layers will become better developed and more widespread. If these layers persist long enough to be buried by a heavy load, they will likely produce avalanches.
With that said, the snowpack is still looking pretty good. Yesterday, my partners and I toured to Hyalite Peak and found stable conditions on southeast and northeast facing slopes. Yesterday, Doug also found good stability in the Lionhead when he went to investigate an avalanche report. The slide was reported as human triggered, but upon arrival Doug found that it was a natural avalanche caused by a falling piece of cornice (photo). The crown was 50 feet wide with a small run out - the slide had limited propagation and no other signs of instability were observed - which was encouraging.
This event basically sums up our current situation. Most slopes are stable, but a few harbor buried weak layers capable of producing avalanches (photo). Slopes where the snowpack is less than a meter deep, specifically those in steep, rocky terrain will be most susceptible to human triggered slides.
One area to pay attention to will be upper elevation slopes in the Bridger Range. Shallow soft slabs may exist below the ridgeline, which could be sensitive to human triggers. I don't expect these slabs to be deep or well connected, but it's something to look for if touring in the Bridgers.
Today, generally safe avalanche conditions exist on slopes less than 35 degrees which have a LOW avalanche danger. Slopes steeper than 35 degrees have a MODERATE Avalanche Danger.
The next advisory tomorrow morning at 7:30 a.m. If you have any snowpack or avalanche observations, drop us a line at firstname.lastname@example.org or call us at: 406-587-6984.
PHOTOS, SNOWPITS, and VIDEOS
1. For links to Articles, Education and (photos) and (videos) listed in the above report, please visit this Link.
If you have any snowpack or avalanche observations, drop them a line at email@example.com or call: 406-587-6984.
For detailed Avalanche Terms utilized here, please see the Avalanche Glossary.
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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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