Daily Winter Weather Report
Date: Monday - 13 February 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Canyon||33||11||14||T||33||OC||Calm / Snowing|
|Lake||33||17||18||.25||35||OC||Calm / Snowing|
|Madison||36||24||36||T||22||OC||Calm / Snowing|
|Snake River||41||25||25||1||57||OC||Calm / Snowing|
|Road Section||Status||Conditions||Public Access / Info|
|Gardiner to Mammoth||YR||-||Snow Tires Advised|
|Mammoth to Tower||YR||-||Snow Tires Advised|
|Tower to NE Entrance||YR||-||Snow Tires Advised|
|Beartooth Highway||CLOSED *||CLOSED *||CLOSED *|
|Canyon to Lake||Open||-||All oversnow vehicles|
|Canyon to Tower||CLOSED *||CLOSED *||CLOSED *|
|Firehole Canyon Drive||CLOSED||CLOSED||CLOSED|
|Grant to South Entrance||Open||-||All oversnow vehicles|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||Open||-||All oversnow vehicles|
|Lake to West Thumb||Open||-||All oversnow vehicles|
|Madison to Old Faithful||Open||-||All oversnow vehicles|
|Madison to West Yellowstone||Open||-||All oversnow vehicles|
|Mammoth to Norris||Open||-||All oversnow vehicles|
|Norris to Canyon||Open||-||All oversnow vehicles|
|Norris to Madison||Open||-||All oversnow vehicles|
|Old Faithful to Grant||Open||-||All oversnow vehicles|
YR = Open Year Round / NR = No Restrictions
* NOTE: CLOSED FOR THE WINTER 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 ********
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.
Caution advised for snow falling off of building roofs. Park accordingly.
* * Be prepared for bitter cold (sub-zero) temperatures (some of the temperatures below DO NOT have the Wind Chill factored in). See NWS Weather Forecast below for detailed information. * *
by the National Weather Service Riverton, Wyoming
Today...Patchy freezing fog in the morning. Cloudy with a 50 percent chance of snow. Highs 24°F to 30°F.
Tonight...Mostly cloudy with a 20 percent chance of snow. Lows 12°F to 18°F.
Tuesday...Cloudy with a 50 percent chance of snow. Highs 21°F to 27°F.
Tuesday Night...Mostly cloudy with a 40 percent chance of snow. Lows 8°F to 14°F.
Wednesday...Mostly cloudy with a 20 percent chance of snow. Highs 21°F to 27°F.
Wednesday Night...Partly cloudy with a 20 percent chance of snow. Lows 5°F to 11°F.
Thursday...Partly cloudy. Highs 23°F to 29°F.
Thursday Night...Partly cloudy with a 20 percent chance of snow. Lows 7°F to 13°F.
Friday...Mostly cloudy in the morning then becoming partly cloudy. A 20 percent chance of snow. Highs 25°F to 31°F.
Friday Night...Partly cloudy with a 20 percent chance of snow. Lows 5°F to 11°F.
Saturday...Partly cloudy. Highs 26°F to 32°F.
Saturday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 8°F to 14°F.
Sunday...Mostly cloudy with a 20 percent chance of snow. Highs 26°F to 32°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||79||Parker Peak||61|
|Blackwater||66||Snake River Station||50|
|Evening Star||73||Sylvan Road||39|
|Fisher Creek||79||Thumb Divide||44|
|Grassy Lake||75||Two Ocean Plateau||81|
|Lewis Lake Divide||69||West Yellowstone||31|
|Madison Plateau||49||Whiskey Creek||40|
from the Gallatin National Forest Avalanche Center - 13 February 2012 - 7:30 am - this report is by Eric Knoff. This advisory does not apply to operating ski areas.
During the past twenty four hours no new snow has fallen over our forecast area. This morning, mountain temperatures are in the teens Fahrenheit under mostly cloudy skies and winds are blowing out of the West-northwest at 5-15 mph. Today, temperatures will warm into the mid twenties Fahrenheit and winds will remain light out of the West-northwest at 5-15 mph. A weak weather disturbance will bring a chance of snow showers to the mountains through the day. A trace to one inch is possible by this afternoon. A better chance of snow will arrive later tomorrow.
Snowpack and Avalanche Discussion:
The mountains around Cooke City:
Conditions remain touchy in the mountains around Cooke City. Yesterday, skiers remotely triggered an avalanche on a Southeast facing slope around 9,500 feet. A large natural avalanche was also observed on the south face of Mount Abundance, the same slope that ripped to the ground eleven days ago. When natural activity and remote triggering take place, it's a clear indication very unstable conditions exist.
It was also noted slopes that avalanched earlier in the season are avalanching again. Unfortunately, this may be a trend that sticks around – something to consider when riding in the backcountry.
While the snowpack works overtime to adjust, it will remain sensitive to the weight of a skier or rider. Slopes with a southerly aspect appear to be the most active, but all slopes will be capable of producing avalanches.
Today, human triggered avalanches remain likely and the Avalanche Danger is rated CONSIDERABLE.
The Madison Range, southern Gallatin Range and the Lionhead area near West Yellowstone:
The snowpack resembles a crooked old house with a weak foundation. It has a rickety structure but without a significant load, it has entered a fragile state of balance. Applying load to this snowpack would be like building an additional level on the already shaky house - potentially causing the whole thing to come crashing down.
Yesterday, I skied in the southern Madison Range and found a snowpack that made me cringe. However, my partner and I did not experience any signs of instability and observed no natural activity, a sign the snowpack is well adjusted.
Triggering an avalanche today will require finding the right spot on the right slope. Areas where the snowpack is thinner, mainly in steep rocky terrain or around thin scoured areas will be likely trigger points. Although the avalanche danger is settling down, now is not the time to push it in big terrain. If an avalanche is triggered, it will likely break deep and carry severe consequences.
Today, heightened avalanche conditions exist on specific terrain features and the Avalanche Danger is rated MODERATE.
The northern Gallatin Range and the Bridger Range:
The snowpack structure between the northern Gallatin Range and Bridger Range is dissimilar. The northern Gallatin Range has a deeper more stable snowpack, while the Bridger Range has a pack that is shallow and weak. Despite their differences, the threat of triggering an avalanche remains the same.
The most likely areas where a skier or rider will find unstable snow will be in steep rocky terrain. On Saturday a skier triggered and was caught in a small slide up the Flanders drainage in Hyalite. The slide occurred after the skier jumped 3 to 4 feet onto a small patch of snow in rocky terrain. The snow released carrying the skier with it. Fortunately the skier escaped unharmed.
This is a fine example that human triggered avalanches remain possible in steep terrain where the Avalanche Danger is rated MODERATE. Less steep slopes have a LOW 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.
The Friends of the Avalanche Center installed a Beacon Training Park outside West Yellowstone. It's located south of town on the main snowmobile trail. Stop by and do a quick practice before heading off into the mountains!
EDUCATION, EVENTS, PHOTOS, SNOWPITS, and VIDEOS
3. Check out all our education programs, Click Here.
Information provided by Doug Chabot, Mark Staples, and Eric Knoff from the Gallatin National Forest Avalanche Center. For Events and Education, or Photos and Videos, please visit the Avalanche Centers Website!
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.
Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center
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