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Daily Winter Weather Report
Date: Saturday - 29 December 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Bechler||12.0||4.0||4.0||0||30.82||OC||Wind gusts @ 2 mph|
|Lake||9.0||8.1||8.1||OC||W @ 5 mph|
|Mammoth||16.2||12.6||16.1||.01||6.76||OC||SE @ 6 - 9 mph|
|Old Faithful||11.6||7.7||7.7||0||8.49||OC||SE @ 3 - 4 mph|
|Thorofare||5.0||-1.0||-1.0||0||4||OC||N @ 1 - 2 mph|
|Tower||9.6||5.0||9.6||.01||7.17||OC||Gust @ 1 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: Mostly sunny in the morning then becoming partly cloudy. Highs 16°F to 22°F. Lowest wind chill readings -14°F to -24°F in the morning.
Tonight: Cloudy. Slight chance of snow in the evening...then chance of snow after midnight. Chance of snow 50 percent. Lows 1°F to 7°F.
Sunday: Mostly cloudy with a 40 percent chance of snow. Highs 15°F to 21°F.
Sunday Night: Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows -2°F to 4°F.
Monday: Partly cloudy. Highs 14°F to 20°F.
Monday Night / New Years Eve: Partly cloudy. Lows -2°F to 4°F. * Happy New Year *
Tuesday / New Years Day: Partly cloudy. A 20 percent chance of snow in the afternoon. Highs 15°F to 21°F. * Happy New Year *
Tuesday Night / New Years Night: Partly cloudy. Lows 0°F to 6°F. * Happy New Year *
Wednesday: Partly cloudy. Highs 17°F to 23°F.
Wednesday Night: Partly cloudy in the evening then clearing. Lows -5°F to 5°F.
Thursday: Mostly sunny. Highs 21°F to 27°F.
Thursday Night: Partly cloudy. Lows 2°F to 8°F.
Friday: Partly cloudy. Highs 22°F to 28°F.
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|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||73||Parker Peak||46|
|Blackwater||47||Snake River Station||31|
|Evening Star||49||Sylvan Road||21|
|Fisher Creek||64||Thumb Divide||38|
|Grassy Lake||52||Two Ocean Plateau||58|
|Lewis Lake Divide||61||West Yellowstone||19|
|Madison Plateau||53||Whiskey Creek||24|
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from the Gallatin National Forest Avalanche Center - December 29, 2012 - this report is by Eric Knoff. This advisory does not apply to operating ski areas.
Over the past 24 hours a trace to one inch of snow fell in the mountains. Currently, temperatures are in the single digits Fahrenheit and westerly winds are blowing 5 to 15 mph. Today, temperatures will warm into the high teens to low twenties Fahrenheit and winds will continue to blow 5 to 15 mph from the west. Skies will become partly to mostly cloudy by this afternoon as a weak storm system approaches. Light snow is likely by tomorrow morning with 1 to 3 inches possible by tomorrow afternoon.
Snowpack and Avalanche Discussion:
The Bridger, Gallatin and Madison Ranges, the Lionhead area near West Yellowstone and Cooke City:
Triggering an avalanche today will be a lot like hitting the bull's eye on a dart board. It could take dozens of throws or you could get lucky (or in this case unlucky) on the first toss. Yesterday, I observed this 'dart board' scenario in the mountains around Cooke City. I was amazed at the terrain people were riding without triggering slides. That was, until we came across a slope that had recently avalanched (photo, video). This slide occurred on a southwest facing slope what was heavily wind loaded.
Today, the primary avalanche concern will be wind slabs. Yesterday, gusty west-northwest winds developed sensitive soft slabs on leeward slopes. Both the Moonlight Basin and Big Sky Ski Patrols reported triggering fresh wind slabs during control work. Also, a skier near Cooke City reported triggering soft slabs on east facing slopes below ridgelines.
Winds died down yesterday afternoon allowing recently formed wind drifts a little time adjust. In areas where wind deposited snow rests over a thin layer of facets, human triggered avalanches will be more likely. On slopes that lack near surface instabilities, fresh wind drifts will be more stubborn. This creates a tricky scenario. The best approach today will be to recognize and avoid wind loaded slopes, especially those in steep, upper elevation terrain.
There is a chance that slides could fail on faceted layers near the ground. Impacting deeper weak layers will be easiest on slopes that have a thin and variable snowpack. Once a weak layer collapses, it can propagate into areas where the snowpack is deeper (photo).
Right now more slopes are stable than unstable, but human triggered avalanches remain possible and the Avalanche Danger is rated MODERATE.
The next advisory tomorrow morning at 7:30 a.m. If you have any snowpack or avalanche observations, drop us a line at email@example.com 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 firstname.lastname@example.org 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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