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Daily Winter Weather Report
Date: Tuesday - 01 January 2013
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Mammoth||21.7||1.7||12.5||0||6.76||OC||SSW @ 6 - 9 mph|
|Old Faithful||14.7||-16.0||5.5||.12||8.63||OC||ESE @ 3 mph|
|Thorofare||15.0||1.0||2.0||.03||4.08||OC||Gust @ 2 mph|
|Tower||14.0||-6.5||8.4||0||7.17||OC||NNW @ 2 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 / New Years Day: Partly cloudy. Highs 12°F to 18°F. * Happy New Year *
Tonight / New Years Night: Partly cloudy. Scattered flurries through the night. Lows -3°F to -9°F. * Happy New Year *
Wednesday: Partly cloudy in the morning then clearing. Highs 15°F to 2°F1. Lowest wind chill readings -11°F to -21°F in the morning.
Wednesday Night: Mostly clear. Patchy fog after midnight. Lows -6°F to 2°F.
Thursday: Not as cold. Mostly sunny. Patchy fog in the morning. Highs 23°F to 29°F.
Thursday Night: Mostly clear. Lows 1°F to 7°F.
Friday: Mostly sunny. Highs 19°F to 25°F.
Friday Night: Mostly clear. Lows -1°F to 5°F.
Saturday: Mostly sunny. Highs 23°F to 29°F.
Saturday Night: Mostly clear. Lows 1°F to 7°F.
Sunday: Partly cloudy with a 20 percent chance of snow. Highs 22°F to 28°F.
Sunday Night: Partly cloudy with a 20 percent chance of snow. Lows 4°F to 10°F.
Monday: 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||42|
|Blackwater||45||Snake River Station||28|
|Evening Star||46||Sylvan Road||21|
|Fisher Creek||61||Thumb Divide||35|
|Grassy Lake||49||Two Ocean Plateau||55|
|Lewis Lake Divide||60||West Yellowstone||18|
|Madison Plateau||47||Whiskey Creek||25|
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from the Gallatin National Forest Avalanche Center - January 01, 2013 - this report is by Doug Chabot. This advisory does not apply to operating ski areas.
In the last 24 hours a trace to one inch of snow has fallen with light winds out of the northwest. Temperatures this morning are 5 to 10 degrees Fahrenheit under mostly cloudy skies. Today, temperatures will warm into the teens Fahrenheit as skies begin to clear. A few flurries will dust slopes as winds continue to blow northwest at 10 to 20 mph. Sunny skies are on the docket for the rest of the week.
Snowpack and Avalanche Discussion:
The Bridger, Gallatin and Madison Ranges, the Lionhead area near West Yellowstone and Cooke City:
In order to make good decisions regarding avalanches in the backcountry, there are two questions Mark, Eric and I routinely ask ourselves: What do we know? What should we do about it?
What do we know?
We know that most mountain ranges are generally stable except on individual slopes with a snowpack thinner than three feet deep. These shallow slopes have weak, poorly-bonded faceted grains near the ground that can still avalanche. As evidence, I saw a natural slide on Sunday on Lionhead Ridge (photo) and Eric found a snowmobiler triggered avalanche outside Cooke City on Friday (photo, video). Some other slopes consist entirely of weaker, unbonded facets, but are stable without the burden of new snow. Yesterday, Karl found this on Mount Ellis and Mark found a similar structure on Mount Blackmore.
What should we do about it?
At a minimum we need to probe to check how deep the snow is. If we find three feet or less, it's a good idea to dig and test the snow. I recommend digging all the time, but if you're lazy and slightly hungover today, at least dig where it's thin. On Sunday, I found a thin slope and did stability tests in multiple pits. This particular slope did not have facets, so we rode on it. Yesterday, on a day off, Mark found stable conditions on Mount Blackmore and skied committing lines. Conversely, to the south near Hebgen Lake on the day after Christmas, Eric found a three foot deep snowpack with facets breaking clean in his tests so he stayed off steeper slopes. Digging allows us to quickly look at the snow structure and determine if there are weaker, granular layers trying to support a denser slab. We recognize this as a poor structure and it deserves a few stability tests.
For today, slopes steeper than 35 degrees will have a MODERATE Avalanche Danger. Lower-angled terrain has a LOW Avalanche Danger.
Looking to the future
The top 6 to 12 inches of snow is changing. Cold, clear nights and sunny days signal large fluctuations in the radiation balance which quickly turn snowflakes into weak, poorly-bonded facets and/or promote the growth of feathery surface hoar crystals. This surface snow may become a future weak layer once it gets buried. The formation of these crystals began right before Christmas and will continue this week. A skier in Beehive Basin on Sunday noted small avalanches, 20 to 40 feet wide, breaking a few inches deep, likely on this layer. We'll be keeping an eye on it and so should you.
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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