Daily Winter Weather Report
Date: Thursday - 07 February 2013
|Yellowstone National Park Winter Weather Links|
|Avalanche Advisory||Special Weather Info|
|Daily Winter Weather Report||Winter Road Report|
|Snow Depth Totals||Yellowstone Weather Forecast|
|Station||Pres Temp||Max Temp||Min Temp||New Snow||Depth||Sky||Present Conditions|
|Bechler||11.0||21.0||11.0||0||OC||NE @ 1 - 3 mph|
|Mammoth||24.9||24.9||23.9||0||OC||SE @ 7 - 10 mph|
|Old Faithful||18.4||19.5||18.0||0||24||OC||SSE @ 1 - 3 mph|
|Thorofare||9.0||14.0||9.0||0||OC||SSE @ 3 - 11 mph|
|Tower||14.5||14.8||11.4||0||OC||W @ 1 mph|
* * Live Weather via All Yellowstone WebCams * *
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|Road Section||Status||Conditions||Public Access / Info|
|Gardiner, MT to Mammoth||Open *||Good||STR - Not Maintained from 4:30 PM to 6:00 AM|
|Mammoth to Tower||Open *||Snow Packed/Icy||STR - Not Maintained from 4:30 PM to 6:00 AM|
|Tower to NE Entrance||Open *||Snow Packed/Icy||STR - Not Maintained from 4:30 PM to 6:00 AM|
|Beartooth Highway ♦||CLOSED ♦||CLOSED ♦||CLOSED ♦|
|Canyon to Lake||Open||Poor||Rubber tracked oversnow concession vehicles|
|Canyon to Tower ♦||CLOSED ♦||CLOSED ♦||CLOSED ♦ (Dunraven Pass)|
|Grant to South Entrance||Open||Good||Rubber tracked oversnow concession vehicles|
|Junction to Chief Joseph Hwy ♦||CLOSED ♦||CLOSED ♦||CLOSED ♦|
|Lake to East Entrance||Open||Fair||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|
* = Open year-round to wheeled vehicle travel.
NR=No Restrictions / STA=Snow Tires Advised / STR=Snow Tires Required
♦ = CLOSED FOR THE WINTER SEASON
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. Also, see the Avalanche Advisory posted below.
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by the National Weather Service Riverton, Wyoming
Today: Partly cloudy. South winds around 15 mph. Highs 26°F to 32°F.
Tonight: Partly cloudy in the evening then becoming mostly cloudy. Lows 8°F to 14°F.
Friday: Cloudy with scattered snow showers. Chance of snow 40 percent. Highs 27°F to 33°F.
Friday Night: Cloudy with a 40 percent chance of snow. Northeast winds around 15 mph. Lows 9°F to 15°F.
Saturday: Mostly cloudy with a 30 percent chance of snow. Northeast winds around 15 mph. Highs 21°F to 27°F.
Saturday Night: Mostly cloudy in the evening then becoming partly cloudy. A 30 percent chance of snow. Lows 4°F to 10°F.
Sunday: Mostly cloudy with a 30 percent chance of snow showers. Highs 16°F to 22°F.
Sunday Night: Colder. Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow showers. Lows -8°F to 0°F.
Monday: Partly cloudy. Highs 16°F to 22°F.
Monday Night: Partly cloudy. Lows -4°F to 6°F.
Tuesday: Partly cloudy. Highs 21°F to 27°F.
Tuesday Night: Partly cloudy. Lows 6°F to 12°F.
Wednesday: Partly cloudy with a 20 percent chance of snow. 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||83||Parker Peak||56|
|Evening Star||67||Sylvan Road||29|
|Fisher Creek||76||Thumb Divide||42|
|Grassy Lake||66||Two Ocean Plateau||62|
|Lewis Lake Divide||66||West Yellowstone||26|
|Madison Plateau||56||Whiskey Creek||35|
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from the Gallatin National Forest Avalanche Center - February 07, 2013 - this report is by Mark Staples. This advisory does not apply to operating ski areas.
Under clear skies this morning, mountain temperatures were in the mid-teens Fahrenheit and Southwest winds were blowing 10 to 15 mph gusting to 25 mph. Today an upper level ridge will move east and some clouds will move over the area. Temperatures should climb only a few degrees to near 20 Fahrenheit and winds will continue the same. Some snow will come Friday followed by cold temperatures on Sunday.
Snowpack and Avalanche Discussion:
Bridger Range, Northern Madison Range, and Cooke City:
The odds of triggering an avalanche decrease a little each day without new snow but vary dramatically between slopes. Some slopes have weak, faceted crystals near the ground where the snowpack was less than 3 feet deep (video) prior to last week's snowfall. Other slopes have a thin layer of smaller but equally weak faceted crystals that formed on the snow surface. These faceted crystals formed during periods of cold, clear weather in January and are now buried about 1 to 2 feet deep. Both layers produced avalanches as recently as Monday (avalanche photos).
Where either of these layers exists, the odds of triggering an avalanche are much higher. Slopes without these layers have better stability and lower odds of triggering an avalanche. With such variability, the avalanche danger rating is just a starting point. Revise it up or down depending on your observations and stability tests. For today avalanche conditions remained heightened on specific terrain making human triggered avalanches possible and the Avalanche Danger is rated overall MODERATE.
Southern Madison Range, Gallatin Range, the Lionhead Area near West Yellowstone:
The Gallatin Range generally has facets closer to the ground while the southern Madison Range and Lionhead area generally have facets that formed near the old snow surface. Compared with other parts of the advisory area, these weak layers are much more widespread. On Tuesday I rode in the Taylor Fork area with the director of Montana State University's Snow and Avalanche Laboratory, but it didn't take a scientist to spot faceted layers of snow buried 1 to 2 feet deep. These facets were an obvious stripe in the walls of our snowpits that produced clean, fast, and easy fractures in our stability tests. We found one slope with stable conditions, but this seems to be more the exception than the rule.
Because these areas have widespread, persistent weak layers that produced avalanches over the weekend and continue to yield poor stability test scores, the Avalanche Danger is rated CONSIDERABLE on slopes steeper than 35 degrees and a MODERATE Avalanche Danger on all others.
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.
EDUCATION, PHOTOS, SNOWPITS, and VIDEOS
1. For links to Articles, Education and (photos), (snowpits), or (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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Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center
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