Daily Winter Weather Report
Date: Monday - 06 February 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Road Section||Status||Conditions||Public Access / Info|
|Gardiner to Mammoth||YR||Snow Tires Required|
|Mammoth to Tower||YR||Snow Tires Required|
|Tower to NE Entrance||YR||Snow Tires Required|
|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||Good||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||Good||All oversnow vehicles|
|Madison to West Yellowstone||Open||Good||All oversnow vehicles|
|Mammoth to Norris||Open||Good||All oversnow vehicles|
|Norris to Canyon||Open||Good||All oversnow vehicles|
|Norris to Madison||Open||Fair||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...Sunny in the morning then becoming partly cloudy. Highs 24°F to 30°F. Lowest wind chill readings -10°F to -20°F in the morning.
Tonight...Mostly cloudy. Lows 0°F to 6°F.
Tuesday...Partly cloudy in the morning then clearing. Highs 23°F to 29°F.
Tuesday Night...Partly cloudy in the evening then clearing. Patchy fog after midnight. Lows 0°F to 6°F.
Wednesday...Partly cloudy in the morning then clearing. Patchy fog in the morning. Highs 25°F to 31°F.
Wednesday Night...Partly cloudy with a 20 percent chance of snow. Lows 6°F to 12°F.
Thursday...Partly cloudy with a 20 percent chance of snow. Highs 26°F to 32°F.
Thursday Night...Partly cloudy in the evening then clearing. Lows 5°F to 11°F.
Friday...Mostly sunny. Highs 27°F to 33°F.
Friday Night...Mostly clear. A 20 percent chance of snow after midnight. Lows 10°F to 16°F.
Saturday...Partly cloudy with a 20 percent chance of snow. Highs 27°F to 33°F.
Saturday Night...Partly cloudy with a 20 percent chance of snow. Lows 10°F to 16°F.
Sunday...Partly cloudy with a 20 percent chance of snow. Highs 25°F to 31°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||79||Parker Peak||56|
|Blackwater||59||Snake River Station||51|
|Evening Star||71||Sylvan Road||36|
|Fisher Creek||79||Thumb Divide||42|
|Grassy Lake||75||Two Ocean Plateau||80|
|Lewis Lake Divide||70||West Yellowstone||31|
|Madison Plateau||51||Whiskey Creek||39|
from the Gallatin National Forest Avalanche Center - 06 February 2012 - 7:30 am - this report is by Eric Knoff. This advisory does not apply to operating ski areas.
A fast moving cold front is pushing into southwest Montana from the north. Very little moisture is associated with this front keeping the chance of measurable precipitation low. However, our area will see increasing clouds and cooler temperatures through the day. Currently, skies are clear, winds are light out the North-northeast and temperatures are ranging from the single digits to low teens Fahrenheit. Mountain temperatures will climb into the high teens to low twenties Fahrenheit today and winds will gradually shift to the South-southeast.
Snowpack and Avalanche Discussion:
The southern Madison and southern Gallatin Ranges, the Lionhead area near West Yellowstone and the mountains around Cooke City:
Yesterday, Doug investigated a large natural side that occurred in the Lionhead area on Friday. He found an avalanche that broke up to 3 feet deep, three hundred feet across and ran nearly 800 feet vertical. It was a hard slab that failed on facets near the ground. What was surprising about this avalanche is that it naturally released after the area received only a few inches of new snow. This illustrates the weak and fragile nature of the snowpack in the mountains near West Yellowstone.
The snowpack in the mountains around Cooke City is spatially variable. Some slopes have a deeper, stronger snowpack while others have a layer of facets buried 3 to 4 deep that is still causing avalanches. Slopes with a southerly aspect have the widest distribution of this layer. On Thursday I remotely triggered a large slide on the south face of Mount Abundance and on Saturday riders observed a natural avalanche in the same area.
A calm weather pattern over the past few days is making it more difficult to trigger avalanches. However, it is still very possible to trigger a slide on slopes steeper than 35 degrees. Avalanches will be easier to trigger in areas where the snowpack is thinner, such as rock outcroppings or thin scoured areas.
Today, the Avalanche Danger is CONSIDERABLE on slopes steeper than 35 degrees. Less steep slopes have a MODERATE Avalanche Danger.
The Bridger Range and northern Madison Range:
Mild temperatures, light winds and the lack of measurable precipitation have allowed the snowpack to become well adjusted. Although it is becoming increasingly difficult to trigger a slide, it is not entirely out of the question. Steep, upper elevation slopes, specifically those that have been previously affected by the wind hold the greatest potential for producing an avalanche. Triggering a slide today will require finding the right spot on the right slope, also known as the sweet spot or trigger point. Places where the snowpack is thinner, mainly around rock outcroppings and shallow scoured areas will be likely trigger points.
Although the avalanche danger is trending down, human triggered avalanches remain possible and the Avalanche Danger is rated MODERATE.
The northern Gallatin Range:
The northern Gallatin Range, especially the Hyalite Canyon area has the strongest snowpack in our forecast area. Limited distribution of buried persistent weak layers and minimal snowfall has allowed the snowpack to find a stable balance. It has been weeks since any natural or human triggered avalanches have been reported. This does not mean that avalanches should be entirely written off. Steep slopes, specifically those in tight gullies or in upper elevation terrain continue to hold the possibility of producing a slide. When traveling in steep terrain, safe backcountry protocol applies and always be thinking about the consequences of a slide.
Today, slopes steeper than 35 degrees have a MODERATE Avalanche Danger. 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
February 8: 4th Annual Montana Ale Works Wine Dinner
Come join us for a wonderful, social evening at Montana Ale Works. Menu and ticket information is here: http://bit.ly/wEg01j.
10th Annual King and Queen of the Ridge
The 10th Annual King and Queen of the Ridge Hike/Ski-a-thon fundraiser is Saturday, Feb 11th. The event supports avalanche education in southwest Montana. Collect pledges for one, two or the most Ridge hikes you can do in the five hours of competition. 100% of the proceeds go to the Friends of Gallatin National Forest Avalanche Center. Kids and families are encouraged to hike too! More Information / Registration Form.
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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