Daily Winter Weather Report
Date: Wednesday - 20 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||13.0||17.0||12.0||.01||OC||NNE @ 2 - 5 mph|
|Mammoth||15.7||27.1||14.6||.01||9||SC||SSE @ 4 - 6 mph|
|Old Faithful||2.0||3.9||-1.6||0||24||OC||ESE @ 1 - 2 mph|
|Thorofare||16.0||18.0||16.0||.08||OC||WNW @ 4 mph|
|Tower||5.8||12.2||4.7||0||OC||SW @ 1 - 2 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||Rubber tracked oversnow concession vehicles|
|Canyon to Tower ♦||CLOSED ♦||CLOSED ♦||CLOSED ♦ (over Dunraven Pass)|
|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|
* = 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 ********
|¤ ¤ - Please Note - ¤ ¤||There is NO wheeled vehicle travel East of Cooke City, Montana during the winter. This road (U.S. Highway 212), is Closed to Wheeled Vehicle Travel to the East as it is NOT plowed or maintained until late spring. In order to exit Silver Gate, Montana, or Cooke City, Montana, and Yellowstone, you must travel West back through Yellowstone to the North Entrance at Gardiner, Montana to exit the park and these towns.|
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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: Cloudy with scattered snow showers. Chance of snow 50 percent. Highs 28°F to 34°F.
Tonight: Cloudy with a 50 percent chance of snow. Lows 10°F to 16°F.
Thursday: Cloudy with a 40 percent chance of snow. Highs 22°F to 28°F.
Thursday Night: Mostly cloudy with a 40 percent chance of snow. Lows 8°F to 14°F.
Friday: Breezy. Cloudy with a 40 percent chance of snow. Southwest winds 15 to 20 mph in the afternoon. Highs 21°F to 27°F.
Friday Night: Cloudy. Chance of snow in the evening...then snow likely after midnight. Light snow accumulations. Chance of snow 60 percent. Lows 13°F to 19°F.
Saturday: Snow likely. Light snow accumulations. Chance of snow 70 percent. Highs 28°F to 34°F.
Saturday Night: Cloudy with a 50 percent chance of snow. Lows 9°F to 15°F.
Sunday: Cloudy with a 30 percent chance of snow. Highs 21°F to 27°F.
Sunday Night: Mostly cloudy with a 20 percent chance of snow. Lows 7°F to 13°F.
Monday: Mostly cloudy with a 30 percent chance of snow. Highs 25°F to 31°F.
Monday Night: Mostly cloudy with a 30 percent chance of snow. Lows 9°F to 15°F.
Tuesday: Mostly cloudy with a 20 percent chance of snow. Highs 25°F to 31°F.
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|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||82||Parker Peak||58|
|Evening Star||66||Sylvan Road||30|
|Fisher Creek||78||Thumb Divide||43|
|Grassy Lake||67||Two Ocean Plateau||65|
|Lewis Lake Divide||66||West Yellowstone||26|
|Madison Plateau||54||Whiskey Creek||34|
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from the Gallatin National Forest Avalanche Center - February 20, 2013 - this report is by Doug Chabot. This advisory does not apply to operating ski areas.
Since yesterday morning a trace to one inch of snow fell in the southern mountains. Under clear to partly cloudy skies temperatures are in the teens Fahrenheit and winds are eerily calm. Clouds will increase today with light northwest winds and temperatures in the low twenties Fahrenheit. Scattered snow showers will drop 1 to 2 inches tonight.
Snowpack and Avalanche Discussion:
Yesterday there were two human triggered avalanches outside Cooke City. These are on the heels of slides on Saturday (photo) and Monday (photo). A skier took a long, nasty ride down an east facing couloir off Miller Ridge yesterday when the cornice he was standing on broke and triggered a slide. He was not buried and sustained minor injuries. Also yesterday, sledders triggered a slide on a southwest facing slope in Sheep Basin where there was a thin snowpack (photo). These avalanches are breaking on facets in shallow areas or on a thin layer of facets sitting on an ice crust 1 to 2 feet deep. All this avalanche activity is causing me deep concern. Bulls-eye data is not to be trifled with. My uncertainty level about stability is higher than I want, so I'm being conservative in my danger rating and folks should be conservative in their travel habits. The Avalanche Danger is rated CONSIDERABLE on all slopes steeper than 35 degrees and MODERATE on all other terrain.
Bridger, Gallatin, and Madison Ranges, and Lionhead Area near West Yellowstone:
There have been avalanches or signs of instability reported every day since Friday. Besides the avalanche on Bridger Peak, four snowmobilers in Lionhead on Sunday were searching for the last scraps of untracked powder when they triggered a slide catching all of them (photo). Two riders deployed their airbags and everyone was uninjured.
From the Bridger Range to West Yellowstone, snow depths may vary, but the culprit creating these instabilities are buried facets. In thinner spots these are found 2 to 3 feet deep on the ground, while in deeper areas they are located midpack. Yesterday, Mark rode and dug along Buck Ridge. On most slopes he found weak snow in the lower half of the snowpack and his stability tests showed lingering problems (snowpit). Conditions are not "green light" or "go for it", here or anywhere else.
Assessment of snow stability is tricky and serious. As we can see with wall to wall tracks, the snowpack is not hair trigger. In fact, most people can blindly ski or snowmobile around and return unscathed. Natural avalanches are not happening; cracking and collapsing are not found on many slopes; the recent avalanches might be miles away from your intended line. But do not fool yourself into thinking everything is honkey dory. I call these conditions a "scary" Moderate. This is when our travel advice follows the recommendations under a Considerable danger ("careful snowpack evaluation…"), but the likelihood of avalanches along with their size fit into a Moderate danger ("human triggered possible…naturals unlikely"). For today, the Avalanche Danger is rated (scary) MODERATE.
The next advisory tomorrow morning at 7:30 AM. 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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Back to the Yellowstone Daily Winter Reports or the Yellowstone Weather Page
Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center
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