Daily Winter Weather Report
Date: Friday - 22 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||16.4||19.8||12.9||.01||9||OC||SE @ 3 - 5 mph|
|Old Faithful||0.3||11.6||-1.0||0||24||OC||E @ 4 - 6 mph|
|Thorofare||7.0||8.0||7.0||.16||OC||NW @ 4 - 6 mph|
|Tower||5.9||10.1||5.7||.01||OC||SSW @ 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: Cloudy with scattered snow showers. Southwest winds around 15 mph in the afternoon. Chance of snow 40 percent. Highs 19°F to 25°F.
Tonight: Breezy...snow. Snow accumulation of 1 to 4 inches. Southwest winds 15 to 20 mph. Chance of snow 90 percent. Lows 12°F to 18°F.
Saturday: Breezy...snow. Snow accumulation of 2 to 3 inches. West winds 15 to 20 mph. Chance of snow near 100 percent. Highs 19°F to 25°F.
Saturday Night: Colder...cloudy. Snow likely in the evening... Then chance of snow after midnight. Snow accumulation up to 1 inch. Total snow accumulation 3 to 8 inches. West winds around 15 mph. Chance of snow 60 percent. Lows 4°F to 10°F.
Sunday: Breezy. Mostly cloudy with scattered snow showers. West winds 15 to 20 mph in the afternoon. Chance of snow 40 percent. Highs 19°F to 25°F.
Sunday Night: Mostly cloudy with scattered snow showers. Chance of snow 30 percent. Lows 4°F to 10°F.
Monday: Mostly cloudy with a 30 percent chance of snow. Highs 22°F to 28°F.
Monday Night: Mostly cloudy with a 50 percent chance of snow. Lows 9°F to 15°F.
Tuesday: Mostly cloudy with a 40 percent chance of snow. Highs 22°F to 28°F.
Tuesday Night: Mostly cloudy with a 20 percent chance of snow. Lows 6°F to 12°F.
Wednesday: Mostly cloudy with a 20 percent chance of snow. Highs 24°F to 30°F.
Wednesday Night: Mostly cloudy with a 20 percent chance of snow. Lows 11°F to 17°F.
Thursday: 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||87||Parker Peak||59|
|Evening Star||66||Sylvan Road||32|
|Fisher Creek||78||Thumb Divide||43|
|Grassy Lake||69||Two Ocean Plateau||65|
|Lewis Lake Divide||67||West Yellowstone||26|
|Madison Plateau||55||Whiskey Creek||35|
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from the Gallatin National Forest Avalanche Center - February 22, 2013 - this report is by Mark Staples. This advisory Does Not Apply to operating ski areas.
It's snowing this morning. As of 6:00 AM the mountains near Bozeman and Big Sky received 1 to 3 inches of snow and all other areas received a trace. Temperatures were in the single digits and low teens Fahrenheit. Ridgetop winds at Bridger Bowl and Hyalite Canyon were blowing 20 to 35 mph from the West. Most other areas this morning had winds blowing 10 to 25 mph from the West. Snow will end this morning but return late afternoon or early evening.
Today will remain cold with temperatures struggling to climb out of the teens Fahrenheit and winds may increase a bit more this afternoon with the next round of snow. Snowfall today and tonight should bring 2 to 4 inches of new snow by tomorrow morning although tonight's snow should favor the mountains near Cooke City and West Yellowstone.
Snowpack and Avalanche Discussion:
In many places near Cooke City, the snowpack is very deep. Where it isn't deep will be a good place to trigger an avalanche like one above Sheep Creek. Look for exposed rocks or any place you think your sled could tag a buried rock or stump.
There is another problem that is more widespread and responsible for several other recent avalanches. A very thin layer of small faceted crystals formed about a week and a half ago. Doug found this layer on most aspects yesterday buried 1.5 feet deep (photo, video). This layer is difficult to see, but it exists next to an ice crust on southerly aspects. Until more snow and wind-blown snow add stress to the snowpack, avalanches will not occur on every slope; however, the possibility is lurking on most. Make sure your partners watch from a safe location (not the toe of a slope) and consider the consequences of a slide like being pushed into trees or over rocks. For today the Avalanche Danger is rated MODERATE.
Bridger, Gallatin, and Madison Ranges, and Lionhead Area near West Yellowstone:
Many slopes have a persistent layer of faceted snow crystals buried in the upper 3 feet of the snowpack. In most cases this layer is very obvious visually, while digging, and in stability tests. Recent avalanches provide clear evidence of this layer's ability to fracture. Avalanches have occurred on Bridger Peak (accident report), Lionhead, Skyline Ridge, Fan Mountain, and Cedar Mountain. Additionally the Big Sky Ski Patrol has triggered avalanches in undisturbed areas with basically a backcountry snowpack.
Why are there tracks on many other slopes but no avalanches? This weak layer will definitely propagate a fracture (video). The missing step has been fracture initiation which is more difficult without stress from much new snow or wind-blown snow. Both snow and wind are coming. Conditions are not all doom and gloom. Some slopes lack this weak layer of facets, but it requires several snowpits to confirm this layer doesn't exists.
With a persistent weak layer buried on many slopes, human triggered avalanches remain possible. Unfortunately this layer will not show many signs of instability, and skiers and riders can hit many slopes before one slides. Today, the Avalanche Danger is rated 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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