Daily Winter Weather Report
Date: Saturday - 14 January 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|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||Fair||All oversnow vehicles|
|Firehole Canyon Drive||CLOSED||CLOSED||CLOSED|
|Grant to South Entrance||Open||Good||All oversnow vehicles|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||Open||Good||All oversnow vehicles|
|Lake to West Thumb||Open||Good||All oversnow vehicles|
|Madison to Old Faithful||Open||All oversnow vehicles|
|Madison to West Yellowstone||Open||All oversnow vehicles|
|Mammoth to Norris||Open||Fair||Caution for drifts & ruts|
|Norris to Canyon||Open||Good||All oversnow vehicles|
|Norris to Madison||Open||Fair||All oversnow vehicles|
|Old Faithful to Grant||Open||All oversnow 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 ********
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.
Caution advised for snow falling off of building roofs. Park accordingly.
* * Be prepared for bitter cold (sub-zero) temperatures. See NWS Weather Forecast below for detailed information. * *
by the National Weather Service Riverton, Wyoming
Today...Breezy. Partly cloudy. Highs 24°F to 30°F. Southwest winds 15 to 25 mph.
Tonight...Windy. Partly cloudy. Lows 9°F to 15°F. Southwest winds 20 to 30 mph. Gusts up to 45 mph in the late evening and overnight.
Sunday...Windy. Partly cloudy with slight chance of snow in the morning...then mostly cloudy with chance of snow in the afternoon. Highs 21°F to 27°F. Southwest winds 20 to 30 mph. Chance of snow 50 percent.
Sunday Night...Breezy...colder. Snow likely in the evening...then snow after midnight. Snow accumulation of 2 to 3 inches. Lows -2°F to 4°F. West winds 15 to 20 mph. Chance of snow 80 percent.
Monday / Martin Luther King Jr Day...Colder. Snow in the morning...then snow likely in the afternoon. Snow accumulation of 2 to 3 inches. Total snow accumulation 4 to 6 inches. Highs 6°F to 12°F. West winds around 15 mph in the afternoon. Chance of snow 80 percent.
Monday Night / Martin Luther King Jr Day...Cloudy with a 20 percent chance of snow. Lows -1°F to -7°F. Wind chill readings -21°F to -31°F.
Tuesday...Breezy. Mostly cloudy with a 50 percent chance of snow. Highs 11°F to 17°F. Wind chill readings -22°F to -32°F.
Tuesday Night...Breezy. Cloudy with a 50 percent chance of snow. Lows -1°F to 5°F.
Wednesday...Breezy. Snow likely. Highs 18°F to 24°F. Chance of snow 70 percent.
Wednesday Night...Breezy. Snow likely. Lows 11°F to 17°F. Chance of snow 70 percent.
Thursday...Breezy. Not as cold. Snow likely. Highs 26°F to 32°F. Chance of snow 70 percent.
Thursday Night...Breezy. Snow likely. Lows 15°F to 21°F. Chance of snow 60 percent.
Friday...Breezy. Cloudy with a 50 percent chance of snow. Highs 26°F to 32°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||48||Parker Peak||43|
|Blackwater||49||Snake River Station||30|
|Evening Star||52||Sylvan Road||29|
|Fisher Creek||56||Thumb Divide||30|
|Grassy Lake||45||Two Ocean Plateau||58|
|Lewis Lake Divide||44||West Yellowstone||22|
|Madison Plateau||34||Whiskey Creek||26|
from the Gallatin National Forest Avalanche Center - 14 January 2012 - 7:30 am - this report is by Mark Staples. This advisory does not apply to operating ski areas.
This morning in the northern areas near Bozeman and Big Sky, mountain temperatures were in the low 20s Fahrenheit and winds were blowing 20-40 mph from the West. Further south near West Yellowstone and Cooke City, temperatures were in the low teens Fahrenheit and winds were blowing 10-20 mph from the Southwest. Today will warm into the high 20s Fahrenheit and winds will increase ahead of an approaching cold front. Next week may get snow every day. While no snow will fall by tomorrow morning, we will see Tom Brady and the Patriots crush the Broncos this evening.
Snowpack and Avalanche Discussion:
The Bridger, Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, and the mountains around Cooke City:
During the last two weeks, avalanche conditions have become more variable, and some slopes are more prone to producing avalanches than others. Slopes that are more likely to produce an avalanche have:
• Wind deposited snow from Tuesday night's storm or other wind slabs. These wind slabs, whether new or old, can help propagate a fracture in the weak snow underneath them. Karl describes this situation in a video from the Bridger Range. Eric found a similar situation along Buck Ridge just south of Big Sky yesterday, and snowmobile guides also found it near Cabin Creek.
• Steeper slope angles near 38 degrees. With each increasing degree of steepness, the odds of triggering an avalanche increase. The difference between a 33 degree slope and a 37 degree slope is huge even though both are avalanche terrain.
• High elevation, rocky slopes usually above treeline. These areas usually have variable snow depths, wind slabs, and lots of potential trigger points.
Although conditions are variable, the snowpack throughout the advisory area is about 3 to 5 feet deep. In all cases where a slab is present, stability tests are producing clean fractures about 15-30 inches deep (in the middle of the snowpack). These tests are breaking on either surface hoar, a thin layer of near-surface facets near an ice crust, or on top of a thick layer of depth hoar.
Hyalite Canyon deserves special mention because it has more stable conditions than other areas. Recent wind slabs could produce an avalanche, and some slopes have a layer of near-surface facets that could also produce an avalanche. However, very few avalanches have occurred in this area, and skiers have been able to find many stable slopes. These facts, though, are not a free pass to ski any slope without careful evaluation.
Because the snowpack is not stressed by recent snow, the odds of triggering an avalanche have decreased. Unfortunately the layering of the snowpack has all the ingredients for an avalanche and human triggered avalanches are definitely possible. Today the Avalanche Danger is rated MODERATE.
The Friends of the Avalanche Center installed a Beacon Training Park outside West Yellowstone last Friday. It's located south of town on the main snowmobile trail. Stop by and do a quick practice before heading off into the mountains!
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, EVENTS, PHOTOS, SNOWPITS, and VIDEOS
3. Check out all our education programs, Click Here.
Information provided by Doug Chabot, Mark Staples, and Eric Knoff from the Gallatin National Forest Avalanche Center. For Events and Education, or Photos and Videos, please visit the Avalanche Centers Website!
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.
Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center
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