Daily Winter Weather Report
Date: Monday - 25 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||17.3||17.3||13.2||0||OC||SE @ 7 - 13 mph|
|Old Faithful||13.4||13.6||-1.0||0||OC||SE @ 3 - 5 mph|
|Thorofare||5.0||6.0||4.0||.02||OC||SE @ 4 - 6 mph|
|Tower||3.6||6.0||0.8||.01||OC||S @ 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: Breezy. Partly cloudy in the morning...then cloudy with snow in the afternoon. Snow accumulation up to 1 inch. Southwest winds 15 to 20 mph. Chance of snow 80 percent. Highs 21°F to 27°F. Lowest wind chill readings -10°F to -20°F in the morning.
Tonight: Snow. Snow accumulation of 1 to 2 inches. Total snow accumulation 1 to 3 inches. Southwest winds around 15 mph in the evening. Chance of snow 80 percent. Lows 4°F to 10°F.
Tuesday: Mostly cloudy with a 40 percent chance of snow. Highs 21°F to 27°F.
Tuesday Night: Partly cloudy with a 30 percent chance of snow. Lows -1°F to 5°F.
Wednesday: Partly cloudy in the morning then becoming mostly cloudy. Isolated snow showers. Chance of snow 20 percent. Highs 20°F to 26°F.
Wednesday Night: Partly cloudy with scattered snow showers. Chance of snow 30 percent. Lows 4°F to 10°F.
Thursday: Partly cloudy with a 30 percent chance of snow. Highs 23°F to 29°F.
Thursday Night: Partly cloudy with a 20 percent chance of snow. Lows 10°F to 16°F.
Friday: Partly cloudy with a 20 percent chance of snow. Highs 28°F to 34°F.
Friday Night: Partly cloudy. Lows 15°F to 21°F.
Saturday: Partly cloudy. Highs 32°F to 38°F.
Saturday Night: Partly cloudy. Lows 16°F to 22°F.
Sunday: Partly cloudy in the morning then becoming mostly cloudy. A 30 percent chance of snow. Highs 28°F to 34°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||67||Sylvan Road||31|
|Fisher Creek||80||Thumb Divide||45|
|Grassy Lake||72||Two Ocean Plateau||68|
|Lewis Lake Divide||72||West Yellowstone||29|
|Madison Plateau||60||Whiskey Creek||39|
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from the Gallatin National Forest Avalanche Center - February 25, 2013 - this report is by Eric Knoff. This advisory Does Not Apply to operating ski areas.
No new snow has fallen over the past 24 hours. Currently, temperatures are in the single digits to low teens Fahrenheit and winds are light out of the West-southwest blowing 5 to 20 mph. Today, clouds and wind will increase as a cold front approaches from the west. Before the front arrives temperatures will warm into the twenties Fahrenheit under partly to mostly cloudy skies. The cold front will arrive sometime after noon delivering a brief shot of snow and gusty winds. Light snow showers will develop behind the front with 3 to 5 inches possible by later tonight. After the frontal passage, winds will shift to the Northwest blowing 10 to 20 mph.
Snowpack and Avalanche Discussion:
Bridger, Gallatin, and Madison Ranges, Lionhead Area near West Yellowstone, and Cooke City:
Yesterday, the snowpack received a well deserved break. After a fast and furious storm on Saturday, clear skies and calm weather over the past 24 hours has allowed the snowpack some time to adjust.
Today, the primary avalanche concern will be wind loaded slopes. Strong winds from the north-northwest on Saturday formed wind slabs near ridgelines and exposed terrain features. Wind slabs will be most reactive on south facing slopes where a thin layer of facets around an ice crust exists below the slabs. On Saturday, we found this facet/crust combo to be a concern on south facing slopes in Hyalite. It also produced unstable results during stability tests in the Taylor Fork yesterday. On shadier aspects, wind slabs may be resting over a layer of lower density storm snow which may act as a temporary weak layer. Although wind loaded slopes are slowly stabilizing, they need to be recognized and approached with caution.
A secondary concern is faceted layers buried 1.5 to 3 feet deep (video). Over the past seven days, these layers have been responsible for human triggered avalanches in the Bridger Range, Lionhead area and mountains around Cooke City (photo, photo). The problem with these deeper layers is they do not exist on all slopes and will not display signs of instability such as cracking and collapsing. Triggering a slide on a deeper faceted layer will be easiest on non-uniform slopes where the snowpack is thin and variable (photo). It's safe to assume that all slopes have buried weak layers until proven otherwise.
Today, wind slabs and weak layers make human triggered avalanches possible and 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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