|Yellowstone National Park Winter Weather Links|
|Avalanche Report||Special Weather Info|
|Daily Winter Weather Report||Winter Road Report|
|Snow Depth Totals||Yellowstone Weather Forecast|
Daily Winter Weather Report
Date: Friday - 21 December 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Mammoth||16.2||11.3||11.8||0||6.58||BC||S@9 to 11 mph|
|Old Faithful||-6.2||-13.3||-12.1||0||9.68||BC||ESE@2 mph|
|Tower||-3.2||-7.8||-7.4||0||6.97||BC||N@2 - 3 mph|
Back to Index
|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||CLOSED||CLOSED||CLOSED|
|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 ********
Back to Index
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.
Back to Index
by the National Weather Service Riverton, WY
Today: Breezy. Partly cloudy. South winds 15 to 20 mph. Highs 24°F to 30°F. Lowest wind chill readings -10°F to -20°F in the morning.
Tonight: Partly cloudy. South winds around 15 mph. Lows 3°F to 9°F.
Saturday: Partly cloudy in the morning then becoming mostly cloudy. Intermittent flurries through the day. South winds around 15 mph in the morning becoming south around 15 mph late in the afternoon. Highs 26°F to 32°F.
Saturday Night: Breezy. Mostly cloudy. Slight chance of snow in the evening...then snow likely after midnight. Snow accumulation of 1 to 2 inches. South winds 15 to 20 mph. Chance of snow 70 percent. Lows 9°F to 15°F.
Sunday: Breezy. Snow likely in the morning...then snow likely and isolated thunderstorms in the afternoon. Snow accumulation of 1 to 3 inches. Total snow accumulation 2 to 5 inches. Southwest winds 15 to 20 mph. Chance of precipitation 60 percent. Highs 19°F to 25°F.
Sunday Night: Mostly cloudy with a 50 percent chance of snow. Lows 6°F to 12°F.
Monday: Chance of snow in the morning...then snow likely in the afternoon. Moderate snow accumulations. Chance of snow 70 percent. Highs 18°F to 24°F.
Monday Night: Mostly cloudy with a 40 percent chance of snow. Lows 1°F to 7°F.
Christmas Day / Tuesday: Partly cloudy with a 20 percent chance of snow. Highs 12°F to 18°F. * Merry Christmas *
Christmas Night / Tuesday Night: Partly cloudy with a 20 percent chance of snow. Lows -3°F to 3°F. * Merry Christmas *
Wednesday: Partly cloudy with a 20 percent chance of snow. Highs 17°F to 23°F.
Wednesday Night: Partly cloudy with a 20 percent chance of snow. Lows 9°F to 15°F.
Thursday: Mostly cloudy with a 40 percent chance of snow. Highs 18°F to 24°F.
Back to Index
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||69||Parker Peak||42|
|Blackwater||47||Snake River Station||29|
|Evening Star||49||Sylvan Road||20|
|Fisher Creek||68||Thumb Divide||34|
|Grassy Lake||45||Two Ocean Plateau||57|
|Lewis Lake Divide||60||West Yellowstone||15|
|Madison Plateau||45||Whiskey Creek||20|
Back to Index
from the Gallatin National Forest Avalanche Center - December 21, 2012 - this report is by Mark Staples. This advisory does not apply to operating ski areas.
Dry and windy weather continues. This morning temperatures were in the teens Fahrenheit and southerly winds were blowing 15 to 25 mph with gusts of 40 to 60 mph at the highest ridgetops. The exception is the Bridger Range which had temperatures in the low 20s Fahrenheit and calmer winds. Today will be partly sunny and temperatures will rise into the low 20s Fahrenheit while the Bridger Range could see temperatures approaching 30 Fahrenheit. Strong south winds will continue and only slightly ease by late afternoon. Light snowfall should come sometime Sunday with more possible for Christmas.
Snowpack and Avalanche Discussion:
The Bridger, Gallatin and Madison Ranges, the Lionhead area near West Yellowstone and mountains around Cooke City:
Snowfall early this week combined with strong winds created wind slabs, the primary avalanche problem today. These wind slabs should be much less sensitive to triggering than they were a few days ago, but I doubt they have bonded to the underlying snow enough to trust them in high consequence terrain.
In many places, faceted snow exists near the ground but is weak in only a few areas. Ace Powder Guides investigated the snowpack on Mount Hebgen yesterday near West Yellowstone. They found some faceted crystals but these facets did not propagate cracks in extended column tests. What does this mean? Watch a video from the National Avalanche Center here. We have gotten similar results in many other areas.
One concern I have is the combination of a stiff wind slab resting on weak facets. A recent avalanche was spotted near the summit of Sacajawea likely involving this combination. The Big Sky Ski Patrol also found this combination in a few upper elevation, north facing slopes. I suspect it might be found in other isolated areas like the west side of the Bridger Range where a snowboarder was killed two winters ago in this exact scenario following several days of strong south winds.
For today, the presence of wind slabs that are several days old and isolated slopes that harbor weak faceted snow means human triggered avalanches are possible. For this reason 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 email@example.com 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 firstname.lastname@example.org or call: 406-587-6984.
For detailed Avalanche Terms utilized here, please see the Avalanche Glossary.
Back to Index
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
|I n d e x|
|Adult Programs||Entrances||Old Faithful Live WebCam||Visitor Stats|
|Amphibians||Entrance Fees||Pets||Volcano Observatory|
|Animals||Fall Closure||Phone Numbers||Waterfalls|
|Bear Management||Fishing Fees||Ranger Led Activities||WebCams|
|Bear Sightings||Fishing Regulations||Reptiles||Wildflowers|
|Biking||Getting Here||Reunions||Winter Closing|
|Boating||Hiking||Rivers, Creeks & Streams||Winter Opening|
|Books||History||Roads||Winter Weather Reports|
|Butterflies||Junior Ranger Program||Schedule||Wolf Project|
|Camping||Lakes||Search Page||Wolf Sightings|
|Campground Maps||Location||Spring Opening||Wolverine Help|
|Challenges||Lodging||Star Talks||Yellowstone ~ the Name|
|Chat Page||Lynx Help||Trip Planner pdf||Young Scientist|
|Clinics / Medical||Mammal List||Trip Reports||Youth Conservation Corps|
|Yellowstone National Park WebCams|
|Old Faithful Live||All Old Faithful||Old Faithful Static||Old Faithful VC||North Entrance||Mt Washburn||Mammoth||YVO WebCam|
|Rexburg Idaho WebCams|
|♦ Rexburg, Idaho WebCams ♦|
|Yellowstone Area Highway WebCams|
|Alpine Junction Hwy 89 (South)||Monida Pass I-15 (North)|
|Bozeman Pass I-90 (North)||Osborne Bridge Hwy 20 (West)|
|Henry's Lake North Hwy 20 (West)||Raynolds Pass MT 87 (North or West)|
|Henry's Lake South Hwy 20 (West)||Teton Pass WY 22 (South)|
|State Road Reports|
|Gardiner, Montana||Silver Gate, Montana||West Yellowstone, Montana||Cooke City, Montana|
|Livingston, Montana||Cody, Wyoming||Jackson Hole, Wyoming||Yellowstone National Park|
|The Great Outdoors Net||Great Outdoor Recreational Places|
|Gardiner, Montana||World Humanity|
by John William Uhler
Back to: Yellowstone Up Close and Personal