Daily Winter Weather Report
Date: Thursday - 21 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||10.0||21.0||10.0||.01||OC||N @ 2 mph|
|Mammoth||15.4||21.4||15.4||0||9||OC||WSW @ 3 - 4 mph|
|Old Faithful||1.7||18.2||1.7||0||24||OC||SE @ 1 - 2 mph|
|Thorofare||9.0||14.0||9.0||.01||OC||NNW @ 2 - 4 mph|
|Tower||5.8||16.9||5.8||0||OC||SSW @ 3 - 4 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 scattered snow showers. Chance of snow 40 percent. Highs 22°F to 28°F.
Tonight: Mostly cloudy with scattered snow showers. Chance of snow 40 percent. Lows 6°F to 12°F.
Friday: Breezy. Cloudy with a 50 percent chance of snow. Southwest winds 15 to 20 mph in the afternoon. Highs 21°F to 27°F.
Friday Night: Breezy...cloudy. Chance of snow in the evening... Then snow likely after midnight. Snow accumulation of 1 to 2 inches. Southwest winds 15 to 25 mph. Chance of snow 60 percent. Lows 13°F to 19°F with a possible wind chill of -1°F to -3°F.
Saturday: Snow likely. Snow accumulation around 2 inches. Total snow accumulation 3 to 4 inches. Southwest winds around 15 mph in the morning. Chance of snow 70 percent. Highs 20°F to 26°F.
Saturday Night: Colder. Mostly cloudy with a 50 percent chance of snow. Lows 6°F to 12°F.
Sunday: Mostly cloudy with a 20 percent chance of snow. Highs 19°F to 25°F.
Sunday Night: Partly cloudy in the evening then becoming mostly cloudy. A 20 percent chance of snow. Lows 4°F to 10°F.
Monday: Mostly cloudy with a 30 percent chance of snow. Highs 23°F to 29°F.
Monday Night: Mostly cloudy with a 40 percent chance of snow. Lows 9°F to 15°F.
Tuesday: Mostly cloudy with a 30 percent chance of snow. Highs 23°F to 29°F.
Tuesday Night: Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 8°F to 14°F.
Wednesday: Mostly cloudy with a 20 percent chance of snow. Highs 23°F to 29°F.
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|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||84||Parker Peak||59|
|Evening Star||67||Sylvan Road||31|
|Fisher Creek||79||Thumb Divide||43|
|Grassy Lake||67||Two Ocean Plateau||66|
|Lewis Lake Divide||66||West Yellowstone||25|
|Madison Plateau||55||Whiskey Creek||35|
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from the Gallatin National Forest Avalanche Center - February 21, 2013 - this report is by Mark Staples. This advisory does not apply to operating ski areas.
Since yesterday morning Hyalite Canyon received 3 to 5 inches of snow while all other areas received about 2 inches. Temperatures this morning were in the single digits and low teens Fahrenheit. Northerly winds were averaging 5 mph and gusting to 10 mph. Dry air will move over the area this afternoon and allow some sunshine. Temperatures will warm into the high teens Fahrenheit today and winds will remain light. A trace of snow may fall early tomorrow morning. Winds will shift to the West and increase Friday night.
Snowpack and Avalanche Discussion:
On Tuesday there were two human triggered avalanches near Cooke City. A skier took a long ride down an east facing couloir off Miller Ridge when the cornice he was standing on broke and triggered a slide. He was not buried and sustained minor injuries. Snowmobilers triggered a slide on a southwest facing slope in Sheep Basin with a thin snowpack (photo). Avalanches also occurred on Saturday (photo) and Monday (photo).
These avalanches broke on facets in shallow areas or on a thin layer of facets sitting on an ice crust 1 to 2 feet deep. It is unclear if these recent avalanches are a product of widespread instabilities or a product a lot of people riding in avalanche terrain. Either way, avalanche activity is conclusive evidence of unstable snow and should not be ignored. For this reason, today 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:
The bad news: Weak faceted snow formed about one month ago and is now covered by a slab of snow 2 to 3 feet thick. This is a good recipe for avalanches. A skier triggered slide on Bridger Peak (photos and video) and a snowmobiler triggered slide on Lionhead on Tuesday and Sunday (photo) confirm the ability of this layer to produce avalanches. This weak layer of facets exists on many slopes and will persist for many weeks to come. On Tuesday while riding on Buck Ridge just south of Big Sky, my partner and I found this layer in almost all of our snowpits.
The good news: This layer of facets is variable which means slopes can be found where this layer either doesn't exist or is not very weak. Additionally winds have been incredibly light in recent days, and the load of new snow hasn't been added to the snowpack too quickly. With work (digging several snowpits and carefully assessing the snow and terrain), stable slopes can be found.
With a persistent weak layer buried 2 to 3 feet deep 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 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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