Daily Winter Weather Report
Date: Wednesday - 27 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|
|Mammoth||10.6||15.3||10.1||0||9||BC||WSW @ 5 - 6 mph|
|Old Faithful||13.2||13.3||7.0||0||25||OC||SW @ 3 - 7 mph|
|Thorofare||7.0||7.0||6.0||.09||OC||NW @ 6 - 8 mph|
|Tower||5.9||7.8||2.1||.04||OC||S @ 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||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: Mostly cloudy with isolated snow showers. Southwest winds around 15 mph in the afternoon. Chance of snow 20 percent. Highs 20°F to 26°F. Lowest wind chill readings -10°F to -20°F in the morning.
Tonight: Mostly cloudy with isolated snow showers. Southwest winds around 15 mph until early morning. Chance of snow 20 percent. Lows 4°F to 10°F.
Thursday: Mostly cloudy with scattered snow showers. Southwest winds around 15 mph in the afternoon. Chance of snow 50 percent. Highs 23°F to 29°F.
Thursday Night: Mostly cloudy with scattered snow showers. Southwest winds around 15 mph in the evening. Chance of snow 30 percent. Lows 11°F to 17°F.
Friday: Mostly cloudy in the morning then becoming partly cloudy. Isolated snow showers. Chance of snow 20 percent. Highs 28°F to 34°F.
Friday Night: Partly cloudy. Lows 14°F to 20°F.
Saturday: Mostly sunny. Highs 35°F to 41°F.
Saturday Night: Partly cloudy. Lows 17°F to 23°F.
Sunday: Breezy. Mostly cloudy with a 50 percent chance of snow. Highs 29°F to 35°F.
Sunday Night: Mostly cloudy with a 50 percent chance of snow. Lows 11°F to 17°F.
Monday: Mostly cloudy with a 30 percent chance of snow. Highs 23°F to 29°F.
Monday Night: Partly cloudy with a 20 percent chance of snow. Lows 6°F to 12°F.
Tuesday: Partly cloudy. Highs 26°F to 32°F.
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|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||92||Parker Peak||61|
|Evening Star||66||Sylvan Road||31|
|Fisher Creek||78||Thumb Divide||44|
|Grassy Lake||73||Two Ocean Plateau||69|
|Lewis Lake Divide||71||West Yellowstone||29|
|Madison Plateau||60||Whiskey Creek||38|
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from the Gallatin National Forest Avalanche Center - February 27, 2013 - this report is by Doug Chabot. This advisory Does Not Apply to operating ski areas.
Under partly cloudy skies there's no new snow to report. Yesterday, temperatures reached the 20s Fahrenheit as winds calmed throughout the day. This morning, mountain temperatures are in the single digits Fahrenheit with light ridgetop winds out of the west to southwest (15 to 20 mph). Skies will remain partly cloudy with light winds and temperatures warming into the low 20s Fahrenheit. Tonight will become mostly cloudy, but offer no real chance of snow.
Snowpack and Avalanche Discussion:
Bridger, Gallatin, and Madison Ranges, Lionhead Area near West Yellowstone, and Cooke City:
Mark and his partner skied around Beehive and Bear Basins yesterday. What he found is indicative of the conditions throughout southwest Montana and his tour offers a few key lessons on the snowpack and travel.
Lesson 1: The weakest layer in the snowpack (sugary facets), will be found in the upper three feet (video). Other than slopes holding a thin snowpack, you do not need to dig to the ground to find this.
Lesson 2: Many slopes are stable and offer good skiing and riding. Either slopes lack a significant weak layer or the layer has strengthened and will not break in our stability tests. Mark found this on east facing slopes in Bear Basin.
Lesson 3: If the snow structure looks weak (i.e. a layer of weak, large-grained facets supporting a dense wind slab) yet stability tests show strength, dig another pit. Do not be afraid to throw out stable tests results in a structurally weak snowpack since they represent "false-stable" conditions (article). Mark found a slope in Beehive with one foot of weak facets underlying a two foot slab. His tests showed stability but he did not believe it (snowpit). An hour later he visited Big Sky Snow Safety and learned they triggered a 100-foot wide avalanche with an identical structure and aspect (photo).
Lesson 4: Slopes adjacent to avalanches are also unstable. This lesson comes from Cooke City where a snowmobiler triggered an avalanche right next to a large slide that released last Tuesday (photo). On slopes with recent avalanche activity there's no need to dig a snowpit because avalanches are the number one sign that slopes are prone to slide.
In general the snowpack is not looking too bad, nor is it looking great. You can still trigger avalanches if you hit just the wrong spot. Evidence includes avalanche activity over the last week in the Bridger Range, Lionhead and Cooke City, instability in our snowpits and Mark's concise findings from yesterday. These all point to a MODERATE Avalanche Danger.
Minimizing False-Stable Test Results:
Already this season all three of us have gotten false-stable tests results, which are a bit scary. Stability tests are not 100% accurate and scores showing stability when things are unstable is dangerous, which happen about 10% of the time. This is why we dig multiple snowpits. Karl Birkeland and I studied this "false-stable" problem and made a presentation at the 2006 International Snow Science workshop which you can read HERE.
The next advisory tomorrow morning at 7:30 AM. 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), (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 email@example.com 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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