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Daily Winter Weather Report
Date: Saturday - 22 December 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Mammoth||23.4||14.5||14.5||0||6.58||SC||S@12 to 15 mph|
|Old Faithful||7.0||-9.2||-9.2||0||9.68||OC||Snowing / 1 mph|
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|Road Section||Status||Conditions||Public Access / Info|
|Gardiner to Mammoth||YR||Good||STR|
|Mammoth to Tower||YR||Good||STR|
|Tower to NE Entrance||YR||Good||STR|
|Beartooth Highway||CLOSED *||CLOSED *||CLOSED *|
|Canyon to Lake||Open||Rubber tracked oversnow concession vehicles|
|Firehole Canyon Drive||CLOSED||CLOSED||CLOSED|
|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. Southwest winds around 15 mph in the morning becoming south around 15 mph late in the afternoon. Highs 24°F to 30°F.
Tonight: Breezy...cloudy. Chance of snow in the evening...then snow after midnight. Snow accumulation of 1 to 2 inches. Southwest winds 15 to 20 mph. Chance of snow 80 percent. Lows 9°F to 15°F.
Sunday: Breezy. Snow likely. Snow accumulation of 1 to 2 inches. Southwest winds 15 to 20 mph. Chance of snow 60 percent. Highs 19°F to 25°F.
Sunday Night: Chance of snow in the evening...then snow likely after midnight. Snow accumulation of 1 to 2 inches. Southwest winds around 15 mph. Chance of snow 70 percent. Lows 10°F to 16°F.
Monday: Snow likely. Snow accumulation of 2 to 3 inches. Total snow accumulation 5 to 9 inches. Chance of snow 70 percent. Highs 19°F to 25°F.
Monday Night: Colder. Mostly cloudy with a 40 percent chance of snow. Lows -3°F to 5°F. Wind chill readings -11°F to -21°F.
Christmas Day / Tuesday: Partly cloudy. Highs 11°F to 17°F. * Merry Christmas *
Christmas Night / Tuesday Night: Partly cloudy. A 20 percent chance of snow in the evening. Lows -1°F to 5°F. * Merry Christmas *
Wednesday: Partly cloudy in the morning...then mostly cloudy with a 20 percent chance of snow in the afternoon. Highs 18°F to 24°F.
Wednesday Night: Mostly cloudy with a 50 percent chance of snow. Lows 9°F to 15°F.
Thursday: Mostly cloudy with a 40 percent chance of snow. Highs 19°F to 25°F.
Thursday Night: Mostly cloudy with a 40 percent chance of snow. Lows 4°F to 10°F.
Friday: Mostly cloudy with a 20 percent chance of snow. Highs 17°F to 23°F.
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|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||67||Parker Peak||42|
|Blackwater||45||Snake River Station||29|
|Evening Star||48||Sylvan Road||20|
|Fisher Creek||65||Thumb Divide||34|
|Grassy Lake||43||Two Ocean Plateau||55|
|Lewis Lake Divide||59||West Yellowstone||15|
|Madison Plateau||44||Whiskey Creek||21|
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from the Gallatin National Forest Avalanche Center - December 22, 2012 - this report is by Mark Staples. This advisory does not apply to operating ski areas.
This morning mountain temperatures were in the teens to low 20s Fahrenheit with a slight inversion and valley temperatures in the single digits or colder in places like West Yellowstone. Winds this morning were blowing 10to 15 mph from the south with gusts of 20 to 30 mph. Today cold air will descend over Southwest Montana keeping mountain temperatures from rising much. As a trough of low pressure approaches, south winds will increase and clouds will build this afternoon. Snowfall should begin late afternoon or early this evening mostly to the south. By tomorrow morning the mountains near West Yellowstone and Cooke City will get 3 to 5 inches of snow. Other areas will get 1 to 3 inches.
Snowpack and Avalanche Discussion:
The Bridger, Gallatin and Madison Ranges, the Lionhead area near West Yellowstone and mountains around Cooke City:
Many places and many slopes have a deep and strong snowpack like one Eric found yesterday on Lionhead while teaching an avalanche class (strong snow photo). Some slopes like a steep, rocky one on Sacajawea Peak have much thinner and weaker snow. This particular slope was loaded by wind-blown snow and produced an avalanche (avalanche photo) on Thursday when triggered by a falling cornice. Throughout the advisory area, similar slopes will be likely places to trigger an avalanche. Other places to trigger an avalanche exist at lower elevations with relatively thin snow capped by wind slabs or drifts.
Yesterday my partner and I skied in Truman Gulch on the west side of the Bridger Range. As expected the snowpack was thinner and weaker than it is on the Bridger Bowl side but not necessarily unstable because it lacks the stress from new snow. However, we carefully avoided areas with wind drifted snow. Most interesting was the condition of the snow surface which has weakened and faceted during recent warm sunny days and clear cold nights. The Big Sky Ski Patrol has found similar weaknesses near the surface. This potential, future problem does not appear to be widespread but is worth remembering once more snow comes.
Interested in a summary of recent weather and the outlook for the next three months? It could be wetter and colder! Watch this short video from the National Weather Service in Billings.
Today, because human triggered avalanches remain possible the Avalanche Danger is rated MODERATE.
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.
PHOTOS, SNOWPITS, and VIDEOS
1. For links to all 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
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