Daily Winter Weather Report
Date: Monday - 16 January 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Canyon||30||4||4||2||23||OC||Calm / Light snowfall|
|Madison||30||5||6||2||18||OC||Calm / Light snow|
|Mammoth||39||6||7||2||6||OC||NW@6-10mph / Light snow|
|Old Faithful||34||7||7||1.5||22||OC||NW@6mph / Light snow|
|Tower||39||7||7||2||15||OC||NW@6-8mph / Light snow|
|West Entrance||36||9||9||2||26||OC||Calm / Light snow|
|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||Poor||Due to ruts & drifting|
|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 / Martin Luther King Jr Day...Snow in the morning...then snow likely in the afternoon. Snow accumulation of 1 to 2 inches. Total snow accumulation 2 to 4 inches. Highs 8°F to 14°F. West winds around 15 mph late in the afternoon. Chance of snow 80 percent.
Tonight / Martin Luther King Jr Night...Breezy. Cloudy with a 20 percent chance of snow. Lows -2°F to -10°F. Southwest winds 15 to 20 mph. Wind chill readings -22°F to -32°F.
Tuesday...Breezy. Mostly cloudy with a 50 percent chance of snow. Highs 8°F to 14°F. Southwest winds 15 to 25 mph. Lowest wind chill readings -25°F to -35°F in the morning.
Tuesday Night...Windy. Cloudy with a 50 percent chance of snow. Lows -2°F to 4°F. Southwest winds 20 to 30 mph. Wind chill readings -16°F to -26°F.
Wednesday...Windy. Not as cold. Snow likely in the morning...then snow in the afternoon. Snow accumulation of 2 to 4 inches. Highs 18°F to 24°F. Southwest winds 20 to 30 mph. Chance of snow 80 percent. Lowest wind chill readings -16°F to -26°F in the morning.
Wednesday Night...Breezy. Not as cold. Snow likely. Moderate snow accumulations. Lows 12°F to 18°F. Chance of snow 70 percent.
Thursday...Breezy. Not as cold. Snow likely. Heavy snow accumulations. Highs 26°F to 32°F. Chance of snow 70 percent.
Thursday Night...Breezy. Cloudy with a 50 percent chance of snow. Lows 16°F to 22°F.
Friday...Breezy. Cloudy with a 50 percent chance of snow. Highs 26°F to 32°F.
Friday Night...Breezy. Snow likely. Lows 17°F to 23°F. Chance of snow 60 percent.
Saturday...Breezy. Cloudy with a 50 percent chance of snow. Highs 27°F to 33°F.
Saturday Night...Breezy...colder. Cloudy with a 50 percent chance of snow. Lows 9°F to 15°F.
Sunday...Cloudy with a 50 percent chance of snow. Highs 21°F to 27°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||56||Parker Peak||43|
|Blackwater||47||Snake River Station||30|
|Evening Star||53||Sylvan Road||28|
|Fisher Creek||57||Thumb Divide||29|
|Grassy Lake||44||Two Ocean Plateau||56|
|Lewis Lake Divide||42||West Yellowstone||24|
|Madison Plateau||37||Whiskey Creek||29|
from the Gallatin National Forest Avalanche Center - 16 January 2012 - 7:30 am - this report is by Eric Knoff. This advisory does not apply to operating ski areas.
Over the past 24 hours a cold winter storm has delivered nine inches of low density snow to the Bridger Range, 3 to 4 inches to the mountains around West Yellowstone and Cooke City and 2 to 3 inches in the northern Madison and Gallatin Ranges.
Falling temperatures have arrived with the falling snow. Currently mountain temperatures are ranging from the single digits Fahrenheit above or below zero and winds are blowing 5-20 mph out of the West-northwest with the exception of the Bridger Range where they are blowing 5-15 mph out of the East. Today, light snow will continue to fall in the northern mountains with an additional 1 to 2 inches possible. Temperatures will remain cold with highs in the teens and lows tonight around zero Fahrenheit. Snow will end by this evening, but winds will increase to 20-30 out of the West.
Snowpack and Avalanche Discussion:
The Bridger Range:
The Bridger Range has a unique ability to pull large amounts of snow out of passing storms. Although this talent has not been exercised consistently, they did manage to pull it off with this latest storm. Nine inches of snow totaling close to .5 inches of SWE is the first significant snowfall to grace the Bridger Range since New Years.
This new load likely won't be enough to produce widespread natural activity, but will make the snowpack sensitive the weight of a skier or rider.
Today's primary avalanche concern will be any slope that has received wind deposited snow. Because winds have been blowing out of the east, distribution patterns will be a bit unusual. Likely areas to find wind deposited snow will be on the leeward side of sub-ridges or directly below the ridgeline. Recently formed drifts should be easy to recognize, which will make them easy to avoid.
A secondary concern will be fast moving sluffs. Due to the firm nature of the old snow surface, it will be possible to get large amounts of loose snow moving down hill, especially in steep terrain. Fast moving sluffs can push skiers or riders into unfriendly terrain and also act as triggers for larger more dangerous avalanches.
Today, human triggered avalanches are likely on wind loaded slopes and slopes steeper than 35 degrees where the Avalanche Danger is rated CONSIDERABLE. Less steep, non-wind loaded slopes have a MODERATE Avalanche Danger.
The Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, and the mountains around Cooke City:
The rest of our forecast area did not receive as much snow as the Bridger Range during this last storm cycle. The low density snow that did fall is adding little stress to the existing snowpack. As a result, there has not been a significant change in the avalanche hazard.
Throughout our forecast area we are dealing with one common denominator - weak snow. A lack of substantial precipitation this winter has left the snowpack in poor shape with plenty of weak layers. Slopes with any sort of a slab are the main avalanche concern today.
While some slopes consist mainly of sugary snow with virtually no slab, others have been exposed to conditions that have created a cohesive slab 1 to 3 feet thick, which has formed above poorly bonded facets. The most likely slopes to find a well-developed slab will be in areas that have received any sort of wind-loading over the past two weeks.
Conditions like these are tricky because a slope with a slab will be easier to travel on due to its supportable nature - these slopes will likely not display obvious signs of instability or otherwise give a warning of their unstable structure until you are on them and trigger a slide. Today the best way to avoid triggering an avalanche will be to stay off wind-loaded slopes and slopes greater than 35 degrees. In addition, be cautious around steep and rocky terrain where it may be easier to affect a weak layer and trigger a slide.
Today a weak snowpack structure makes human triggered avalanches possible and 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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