Daily Winter Weather Report
Date: Thursday - 28 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||17.6||18.1||11.6||0||9||OC||WSW @ 2 - 3 mph|
|Old Faithful||9.8||9.8||0.9||0||25||OC||SSW @ 1 - 2 mph|
|Thorofare||10.0||10.0||7.0||.03||OC||ENE @ 3 - 8 mph|
|Tower||5.2||6.4||1.7||.01||OC||SSE @ 2 mph|
* * Live Weather via All Yellowstone WebCams * *
Back to Index
|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||Fair||Rubber tracked oversnow concession vehicles|
|Canyon to Tower ♦||CLOSED ♦||CLOSED ♦||CLOSED ♦ (over Dunraven Pass)|
|Grant to South Entrance||Open||Fair||Rubber tracked oversnow concession vehicles|
|Junction to Chief Joseph Hwy ♦||CLOSED ♦||CLOSED ♦||CLOSED ♦|
|Lake to East Entrance||Open||Fair||Rubber tracked oversnow concession vehicles|
|Lake to West Thumb||Open||Fair||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.|
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. Also, see the Avalanche Advisory posted below.
Back to Index
by the National Weather Service Riverton, Wyoming
Today: Mostly cloudy with a 50 percent chance of snow. West winds around 15 mph late in the afternoon. Highs 24°F to 30°F.
Tonight: Mostly cloudy with a 50 percent chance of snow. West winds around 15 mph early in the evening. Lows 12°F to 18°F.
Friday: Mostly cloudy with scattered snow showers. Chance of snow 40 percent. Highs 29°F to 35°F.
Friday Night: Partly cloudy. Lows 14°F to 20°F.
Saturday: Partly cloudy in the morning then clearing. Highs 35°F to 41°F.
Saturday Night: Partly cloudy in the evening...then mostly cloudy with a 30 percent chance of snow after midnight. Lows 19°F to 25°F.
Sunday: Breezy. Snow likely. Moderate snow accumulations. Chance of snow 70 percent. Highs 30°F to 36°F.
Sunday Night: Breezy...colder. Snow likely. Light snow accumulations. Chance of snow 60 percent. Lows 10°F to 16°F.
Monday: Mostly cloudy with a 30 percent chance of snow. Highs 20°F to 26°F.
Monday Night: Partly cloudy. Lows 7°F to 13°F.
Tuesday: Not as cold. Partly cloudy. Highs 28°F to 34°F.
Tuesday Night: Mostly clear in the evening then becoming partly cloudy. Lows 12°F to 18°F.
Wednesday: Partly cloudy with a 20 percent chance of snow. Highs 32°F to 38°F.
Back to Index
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||94||Parker Peak||60|
|Evening Star||65||Sylvan Road||31|
|Fisher Creek||78||Thumb Divide||44|
|Grassy Lake||74||Two Ocean Plateau||68|
|Lewis Lake Divide||71||West Yellowstone||29|
|Madison Plateau||59||Whiskey Creek||38|
Back to Index
from the Gallatin National Forest Avalanche Center - February 28, 2013 - this report is by Mark Staples. This advisory Does Not Apply to operating ski areas.
This morning clouds were moving over the area with temperatures in the low teens Fahrenheit and winds averaging 10 to 15 mph from the West with gusts of 20 to 30 mph. A little snow may fall this morning followed by a better chance tonight. High temperatures will reach the low to mid 20s Fahrenheit and winds will continue from the West at 10 to 15 mph gusting to 25 mph. By tomorrow morning the mountains near Bozeman and Big Sky should get 2 to 3 inches of snow while areas further south will receive about an inch.
Snowpack and Avalanche Discussion:
Bridger, Gallatin, and Madison Ranges, Lionhead Area near West Yellowstone, and Cooke City:
The problem: Weak layers of faceted crystals exist in the upper three feet of the snowpack on many slopes (video). Some of these layers formed in mid-January and are easy to see while others formed more recently and are harder to see but will usually break cleanly in stability tests. This time of year very small, faceted crystals can form in a matter of hours and get buried. The Big Sky Ski Patrol ski cut a fresh wind slab 1 foot deep by 100 feet wide that fractured on a thin layer of facets that formed in the last few days.
Evidence of the problem: During the last 2 weeks these layers have produced human triggered avalanches. In Beehive Basin near Big Sky on Tuesday, I found one of these layers on a West facing slope. It was very obvious visually and while digging my snowpit but did not break in my stability test. I did not trust it and later learned the Big Sky Ski Patrol triggered an avalanche on a slope with a very similar snowpack structure. This stability test result is called "false stable". Read more in this article. Finding a soft layer of weak facets under a harder layer of cohesive snow is a red flag regardless of stability test results.
What to do: Stable slopes definitely exist but how to find one? It takes a little work. Dig several snowpits about 3 feet deep looking for these faceted layers. Conduct several stability tests. Do it all quickly. It's more important to dig multiple pits quickly than one that takes a while. A single red flag like a nearby avalanche, obvious weak facets under a slab, or poor stability test results is enough evidence to avoid avalanche terrain.
Triggering an avalanche remains possible especially if you hit a thin spot on a slope. These spots are often near rocks which may not be visible as was the case near Flathead Pass in the Bridger Range on Saturday (photo). For today the Avalanche Danger is rated MODERATE.
Minimizing False-Stable Test Results:
Already this season all three of us have gotten false-stable tests results, which are a bit scary. Stability tests are not 100% accurate and scores showing stability when things are unstable is dangerous, which happen about 10% of the time. This is why we dig multiple snowpits. Karl Birkeland and I studied this "false-stable" problem and made a presentation at the 2006 International Snow Science workshop which you can read HERE.
The next advisory tomorrow morning at 7:30 AM. If you have any snowpack or avalanche observations, drop us a line at email@example.com 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 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