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Daily Winter Weather Report
Date: Sunday - 13 January 2013
|Station||Pres Temp||Max Temp||Min Temp||New Snow||Depth||Sky||Present Conditions|
|Mammoth||-8.6||-2.9||-8.6||0||7||BC||SSE @ 2 - 3 mph|
|Old Faithful||-27.1||-12.8||-28.1||0||32||BC||SW @ 1 mph|
|Thorofare||-12.0||-8.0||-12.0||.01||BC||E @ 2 - 3 mph|
|Tower||-16.8||-11.1||-20.6||0||7.26||BC||SSW @ 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||Open||Rubber tracked oversnow concession vehicles|
|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 cloudy. Scattered flurries. Highs -1°F to 5°F. Lowest wind chill readings -24°F to -34°F in the morning.
Tonight: Mostly cloudy. Lows -8°F to -14°F.
Monday: Partly cloudy in the morning then becoming mostly cloudy. A 20 percent chance of snow. West winds around 15 mph late in the afternoon. Highs 3°F to 9°F. Lowest wind chill readings -24°F to -34°F in the morning.
Monday Night: Cloudy with a 50 percent chance of snow. Lows -1°F to -9°F.
Tuesday: Not as cold. Cloudy. Chance of snow in the morning...then slight chance of snow in the afternoon. Chance of snow 40 percent. Highs 13°F to 19°F. Lowest wind chill readings -11°F to -21°F in the morning.
Tuesday Night: Partly cloudy. Lows -1°F to 7°F.
Wednesday: Not as cold. Mostly sunny. Patchy fog in the morning. Highs 20°F to 28°F.
Wednesday Night: Mostly clear. Patchy fog after midnight. Lows -1°F to 7°F.
Thursday: Mostly sunny. Patchy fog in the morning. Highs 20°F to 26°F.
Thursday Night: Mostly clear. Patchy fog after midnight. Lows 3°F to 9°F.
Friday: Mostly sunny in the morning then becoming partly cloudy. Patchy fog in the morning. Highs 20°F to 26°F.
Friday Night: Mostly clear. Patchy fog after midnight. Lows 2°F to 12°F.
Saturday: Partly cloudy. Patchy fog in the morning. 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||78||Parker Peak||47|
|Blackwater||47||Snake River Station||35|
|Evening Star||52||Sylvan Road||23|
|Fisher Creek||68||Thumb Divide||42|
|Grassy Lake||57||Two Ocean Plateau||55|
|Lewis Lake Divide||63||West Yellowstone||24|
|Madison Plateau||53||Whiskey Creek||32|
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from the Gallatin National Forest Avalanche Center - January 13, 2013 - 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 has fallen in the mountains. This morning temperatures are ten to fifteen degrees below zero Fahrenheit and winds are light out of the Northwest blowing 5 to 10 mph. Today, high temperatures will be in the single digits above or below zero degrees Fahrenheit under mostly cloudy skies and winds will stay light out of Northwest. A weak weather disturbance will bring light snow showers to the mountains where a trace to one inch is possible. A stronger system is forecasted to impact the area tomorrow night into Tuesday.
Snowpack and Avalanche Discussion:
Southern Gallatin and Southern Madison Ranges, and Lionhead area near West Yellowstone:
Yesterday, Mark and I went to the Lionhead area near West Yellowstone expecting to find widespread signs of instability on the layer of facets that formed during the first week of January. After digging multiple snowpits and observing miles of avalanche terrain, it became apparent this layer gained strength and handled the most recent load surprisingly well. We did observe a few natural avalanches off the Lionhead Ridge that occurred due to wind loading, but these slides did not propagate far and stayed confined to small starting zones (photo).
However, the area we covered was only a small piece of real estate in a very large development. The Bottom Line: There is a known weak layer throughout this portion of our forecast area which now is now capped by a slab 12 to 14 inches thick (photo). I expect this layer is still capable of producing avalanches; primarily on wind load slopes or slopes steeper than 35 degrees. If you are heading into avalanche terrain pay close attention to signs of instability such as cracking and collapsing and thoroughly assess the snowpack before committing to steeper slopes.
Today, cautious route finding and conservative decision making are essential on wind loaded slopes and slopes steeper than 35 degrees which have a CONSIDERABLE Avalanche Danger. All other slopes have a MODERATE Avalanche Danger.
Bridger, Northern Gallatin, and Northern Madison Ranges, and Cooke City:
Today, the primary avalanche concern for the mountains around Bozeman and Big Sky is wind slabs. Periodic intervals of swirling and gusty winds have formed shallow but stiff slabs on isolated slopes. Yesterday, the Bridger Bowl Ski Patrol triggered wind slabs in mid-elevation terrain during control work. Skiers in the northern Gallatin and Northern Madison Ranges also found wind slabs to be the primary avalanche concern. The best bet today is to stay off steep slopes that are slabby and grabby move into areas that are softer and less wind affected.
There has been little avalanche activity in mountains around Cooke City. This can be attributed to the lack of widespread persistent weak layers. There are a few exceptions, especially in mid to lower elevation areas where the snowpack is thinner. Earlier in the week, a skier got unstable results during stability tests on a mid-elevation Southeast facing slope. This problem is not widespread, but something to consider when riding around creek beds or steep gullies. There is also the possibility a skier or rider could trigger a wind slab in upper elevation terrain.
Today, for the Mountains around Bozeman, Big Sky and Cooke City – 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 firstname.lastname@example.org or call us at: 406-587-6984.
EDUCATION, 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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