|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: Thursday - 20 December 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Mammoth||14.8||12.9||12.9||.02||6.58||BC||SSE@6 to 10 mph|
|Old Faithful||8.4||0.9||3.3||.01||9.68||BC||S@2 - 4 mph|
|Tower||5.8||-1.8||3.1||0||6.97||BC||SE@1 - 2 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. Southwest winds 15 to 20 mph. Highs 14°F to 20°F. Lowest wind chill readings -24°F to -34°F in the morning.
Tonight: Breezy. Partly cloudy. West winds 15 to 20 mph. Lows 3°F to 9°F.
Friday: Not as cold. Partly cloudy. Scattered flurries in the afternoon. South winds around 15 mph. Highs 23°F to 29°F.
Friday Night: Partly cloudy. Scattered flurries in the evening. Southwest winds around 15 mph in the evening. Lows 7°F to 13°F.
Saturday: Partly cloudy in the morning then becoming mostly cloudy. Scattered flurries through the day. Highs 24°F to 30°F.
Saturday Night: Mostly cloudy. Slight chance of snow in the evening...then chance of snow after midnight. Chance of snow 40 percent. Lows 13°F to 19°F.
Sunday: Breezy. Mostly cloudy with a 50 percent chance of snow. Highs 19°F to 25°F.
Sunday Night: Mostly cloudy with a 50 percent chance of snow. Lows 9°F to 15°F.
Monday: Mostly cloudy with a 50 percent chance of snow. Highs 19°F to 25°F.
Monday Night: Mostly cloudy with a 50 percent chance of snow. Lows 4°F to 10°F.
Christmas Day / Tuesday: Partly cloudy with a 20 percent chance of snow. Highs 14°F to 20°F. * Merry Christmas *
Christmas Night / Tuesday Night: Colder. Partly cloudy with a 20 percent chance of snow. Lows -5°F to 1°F. * Merry Christmas *
Wednesday: Partly cloudy. Highs 17 to 23.
Back to Index
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||70||Parker Peak||42|
|Blackwater||49||Snake River Station||29|
|Evening Star||51||Sylvan Road||21|
|Fisher Creek||70||Thumb Divide||36|
|Grassy Lake||45||Two Ocean Plateau||59|
|Lewis Lake Divide||62||West Yellowstone||15|
|Madison Plateau||46||Whiskey Creek||20|
Back to Index
from the Gallatin National Forest Avalanche Center - December 20, 2012 - this report is by Mark Staples. This advisory does not apply to operating ski areas.
This morning temperatures were in the single digits Fahrenheit and ridgetop winds were blowing 15 to 20 mph from the West and Southwest with gusts of 30 mph. Major low pressure systems are impacting the west coast and the Midwest, but southwest Montana remains under a ridge of high pressure. Fortunately this ridge will flatten and move east this weekend. Today temperatures will climb into the teens Fahrenheit, and winds will increase and blow 25 to 40 mph from the Southwest.
Snowpack and Avalanche Discussion:
The Bridger, Gallatin and Madison Ranges, the Lionhead area near West Yellowstone and mountains around Cooke City:
Yesterday's winds transported some of the last remaining snow off ridgetops onto leeward slopes (photo). While this wind-blown snow will not alter the avalanche danger, it will remain the primary avalanche problem (example from Cooke City and the Bridger Range). Wind slabs will be tricky today because many will be stubborn and difficult to trigger. I have been fooled many times by wind slabs when some do not crack and move on small test slopes while others produce avalanches.
A secondary avalanche problem is a persistent weak layer of faceted snow within the bottom 1.5 feet of the snowpack. This layer has both gained strength and adjusted to the weight of new snow from the last two weeks. We have not seen, nor heard reports of recent signs of instability on this layer other than results from ski area explosives. One exception is the west side of the Bridger Range where a weak snowpack and some collapsing was observed three days ago. Yesterday Karl and Doug investigated the snowpack on Saddle Peak where they found greatly improved stability test results in this faceted snow layer compared to what Doug and Eric found 10 days ago (previous snowpit vs current snowpit). However, wind slabs at the top of their snowpit easily fractured.
Wind slabs that can be triggered by a skier or rider combined with slopes harboring some weak snow near the ground mean it's still possible to trigger an avalanche today. 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