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Daily Winter Weather Report
Date: Wednesday - 16 January 2013
|Station||Pres Temp||Max Temp||Min Temp||New Snow||Depth||Sky||Present Conditions|
|Bechler||7.0||7.0||5.0||0||OC||NNE @ 2 mph|
|Mammoth||9.5||10.4||7.8||.06||13||BC||SSW @ 8 - 11 mph|
|Old Faithful||-5.5||5.8||-7.9||0||29||BC||ESE @ 3 - 4 mph|
|Thorofare||2.0||8.0||2.0||0||BC||NNW @ 2 - 3 mph|
|Tower||-3.5||0.4||-4.4||.02||7.29||BC||SW @ 2 - 3 mph|
* * Live Weather via All Yellowstone WebCams * *
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|Road Section||Status||Conditions||Public Access / Info|
|Gardiner to Mammoth||YR||STR|
|Mammoth to Tower||YR||STR|
|Tower to NE Entrance||YR||STR|
|Beartooth Highway||CLOSED *||CLOSED *||CLOSED *|
|Canyon to Lake||Open||Rubber tracked oversnow concession vehicles|
|Firehole Canyon Drive||Open||Rubber tracked oversnow concession vehicles|
|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|
|Tower to Canyon||CLOSED *||CLOSED *||CLOSED *|
YR=Year Round / NR=No Restrictions / STA=Snow Tires Advised / STR=Snow Tires Required
* NOTE: CLOSED FOR THE SEASON.
# Poor road conditions - bare spots and melting snow - Restricted to Snowcoaches Only.
The park service plowing schedule for roads for the spring season.
******** FOR CURRENT ROAD INFORMATION PLEASE CALL 307-344-2117 ********
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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.
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by the National Weather Service Riverton, WY
Today: Mostly cloudy in the morning then clearing. Occasional flurries in the morning. Highs 17°F to 23°F.
Tonight: Mostly clear. Patchy fog after midnight. Lows -4°F to 6°F.
Thursday: Mostly sunny. Patchy fog in the morning. Highs 22°F to 28°F.
Thursday Night: Mostly clear. Patchy fog after midnight. Lows -3°F to 7°F.
Friday: Mostly sunny. Patchy fog in the morning. Highs 22°F to 28°F.
Friday Night: Mostly clear. Patchy fog after midnight. Lows 0°F to 10°F.
Saturday: Mostly sunny. Patchy fog in the morning. Highs 24°F to 30°F.
Saturday Night: Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows 0°F to 10°F.
Sunday: Partly cloudy. Highs 23°F to 29°F.
Sunday Night: Partly cloudy. Lows 1°F to 9°F.
Monday / Martin Luther King Jr Day: Partly cloudy. Highs 21°F to 27°F.
Monday Night / Martin Luther King Jr Night: Partly cloudy in the evening then clearing. Patchy fog after midnight. Lows 2°F to 10°F.
Tuesday: Mostly sunny. Patchy fog in the morning. Highs 22°F to 28°F.
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|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||74||Parker Peak||48|
|Blackwater||46||Snake River Station||33|
|Evening Star||50||Sylvan Road||23|
|Fisher Creek||67||Thumb Divide||41|
|Grassy Lake||54||Two Ocean Plateau||56|
|Lewis Lake Divide||62||West Yellowstone||24|
|Madison Plateau||52||Whiskey Creek||31|
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from the Gallatin National Forest Avalanche Center - January 16, 2013 - this report is by Doug Chabot. This advisory does not apply to operating ski areas.
Early yesterday morning another inch fell around Big Sky before clouds lifted and high pressure moved in. Temperatures this morning are in the teens Fahrenheit up north and single digits Fahrenheit in the southern ranges. West to northwest winds have been blowing 35 to 50 mph in the Bridger Range and up Hyalite Canyon, but are 15 to 30 mph elsewhere. Today will be mostly sunny with mountain temperatures reaching the low twenties Fahrenheit as westerly winds weaken to 15 to 25 mph. No new snow is expected for the next several days.
Snowpack and Avalanche Discussion:
The Bridger, Gallatin, and Madison Ranges, the Lionhead area near West Yellowstone, and Cooke City:
Winds picked up yesterday with plenty of snow to move around. Not all wind-loading was at the ridgelines. Mid and lower mountain winds were reported moving lots of snow too. The winds both give and take. On the take side, a skier found deeply scoured slopes in Montagne's Meadow north of Bridger Bowl (photo). Scoured slopes are safe, but certainly no fun. On the give side of things, a skier in the northern Madison Range yesterday found multiple slopes with soft slabs of wind-blown snow. He triggered a small slide 20 feet across and 15 inches deep which ran a couple hundred feet downhill on a slope of only 30 to 33 degrees. Other signs of instability were cracks shooting 30 feet out from his skis and a "whumph" of the snowpack. It will be easy to trigger avalanches on wind drifts throughout our advisory area, especially since winds were pluming snow around Cooke City and in Hyalite too.
Buried under the top 6 to 16 inches of snow is a weak layer (photo). In most areas this layer is small-grained facets which look and feels like tiny grains of sugar. They do not stick together and with enough snow load, they will fracture. I discovered this in stability tests near West Yellowstone on Monday (video). A few slopes have feathery surface hoar crystals buried instead. The crystal type doesn't matter, just its potential to fracture under the weight of new or wind-blown snow. The weak snow is not evenly distributed throughout southwest Montana. Some slopes have it, some do not. Lucky for us it's so close to the surface even the laziest among us can find it with a quick hand pit or swipe of a shovel. This is the layer that likely caused the collapsing in the northern Madison Range yesterday as well as allows cracks to propagate.
For today, all slopes that are wind-loaded have a CONSIDERABLE Avalanche Danger. Slopes without a wind-load are rated MODERATE Avalanche Danger.
The next advisory tomorrow morning at 7:30 a.m. 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) and (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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