Daily Winter Weather Report
Date: Tuesday - 14 February 2012 - Happy Valentine's Day!
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Canyon||29||14||16||.5||34||OC||Calm / Snowing|
|East Entrance||32||18||22||2||38||OC||Calm / Snowing|
|Grant Village||23||20||23||T||44||OC||Calm / Snowing|
|Lake||25||18||18||2.5||37||OC||Calm / Snowing|
|Old Faithful||31||19||21||.5||28||OC||NW@6-11mph / Snowing|
|Road Section||Status||Conditions||Public Access / Info|
|Gardiner to Mammoth||YR||Intermittent Snow pack & Ice||Snow Tires Required|
|Mammoth to Tower||YR||Intermittent Snow pack & Ice||Snow Tires Required|
|Tower to NE Entrance||YR||Intermittent Snow pack & Ice||Snow Tires Required|
|Beartooth Highway||CLOSED *||CLOSED *||CLOSED *|
|Canyon to Lake||Open||Good to Fair||All oversnow vehicles|
|Canyon to Tower||CLOSED *||CLOSED *||CLOSED *|
|Firehole Canyon Drive||CLOSED||CLOSED||CLOSED|
|Grant to South Entrance||Open||Good to Fair||All oversnow vehicles|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||Open||Good to Fair||All oversnow vehicles|
|Lake to West Thumb||Open||Good to Fair||All oversnow vehicles|
|Madison to Old Faithful||Open||Good to Fair||All oversnow vehicles|
|Madison to West Yellowstone||Open||Good to Fair||All oversnow vehicles|
|Mammoth to Norris||Open||Good to Fair||All oversnow vehicles|
|Norris to Canyon||Open||Good to Fair||All oversnow vehicles|
|Norris to Madison||Open||Good to Fair||All oversnow vehicles|
|Old Faithful to Grant||Open||Good to Fair||All oversnow vehicles|
YR = Open Year Round / NR = No Restrictions
* NOTE: CLOSED FOR THE WINTER 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 (some of the temperatures below DO NOT have the Wind Chill factored in). See NWS Weather Forecast below for detailed information. * *
by the National Weather Service Riverton, Wyoming
Rest Of Today...Snow likely. New snow accumulation of 1 to 2 inches. Total snow accumulation 1 to 4 inches. Highs 23°F to 29°F. West winds around 15 mph late in the afternoon. Chance of snow 70 percent.
Tonight...Cloudy with a 40 percent chance of snow. Lows 3°F to 11°F. West winds around 15 mph early in the evening.
Wednesday...Partly cloudy with a 20 percent chance of snow. Highs 21°F to 27°F.
Wednesday Night...Partly cloudy with slight chance of snow in the evening...then mostly cloudy with occasional flurries after midnight. Patchy fog after midnight. Lows 2°F to 8°F. Chance of snow 20 percent.
Thursday...Partly cloudy. Patchy fog in the morning. Occasional flurries in the afternoon. Highs 22°F to 28°F.
Thursday Night...Partly cloudy in the evening then becoming mostly cloudy. A 20 percent chance of snow. Lows 7°F to 13°F.
Friday...Mostly cloudy with a 20 percent chance of snow. Highs 26°F to 32°F.
Friday Night...Partly cloudy with a 20 percent chance of snow. Lows 8°F to 14°F.
Saturday...Partly cloudy with a 20 percent chance of snow. Highs 26°F to 32°F.
Saturday Night...Mostly cloudy. Slight chance of snow in the evening...then chance of snow after midnight. Lows 6°F to 12°F. Chance of snow 40 percent.
Sunday...Partly cloudy with a 40 percent chance of snow. Highs 21°F to 27°F.
Sunday Night...Mostly cloudy in the evening then becoming partly cloudy. A 30 percent chance of snow. Lows 3°F to 9°F.
Monday ~ Washingtons Birthday...Mostly 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||80||Parker Peak||61|
|Blackwater||65||Snake River Station||50|
|Evening Star||72||Sylvan Road||39|
|Fisher Creek||81||Thumb Divide||43|
|Grassy Lake||76||Two Ocean Plateau||80|
|Lewis Lake Divide||70||West Yellowstone||31|
|Madison Plateau||50||Whiskey Creek||39|
from the Gallatin National Forest Avalanche Center - 14 February 2012 - 7:30 am - this report is by Doug Chabot. This advisory does not apply to operating ski areas.
This morning 3 to 4 inches fell in the northern mountains and 2 to 3 inches down south with light westerly winds averaging 10-15 mph. Temperatures are in the teens Fahrenheit under cloudy skies. Scattered snow showers will drop another inch or two this morning. Under mostly cloudy skies mountain temperatures will rise into the 20s Fahrenheit with winds remaining light out of the west.
Snowpack and Avalanche Discussion:
The mountains around Cooke City:
Cooke City remains our problem child of the mountains. The couple inches of snow last night and a few more today will keep the slopes unstable. Some slopes have large grains of depth hoar underlying the entire snowpack. A fracture on this layer would produce large, deep, and destructive avalanches. Buried one to two feet deep on most slopes is another weak layer: small-grained facets that are not obvious. As you ski or snowmobile around today, remember these two things:
1. Remote Trigger. Two days ago skiers triggered an avalanche from far away. This is a sign of dangerous conditions since it tells us the weak layer is one continuous blanket connecting slopes together.
2. Repeat Offenders. Slopes are sliding for a second time on the foot thick layer of depth hoar. Previous avalanches shave a few inches off the weak layer leaving the bulk of facets to avalanche again. The steep and wide south face of Mount Abundance had a large natural avalanche a few days ago; eleven days after Eric triggered it. Similar aspects and elevations have similar snowpacks, so be extra careful around the south face and chutes of Scotch Bonnet too.
For today, the Avalanche Danger is rated CONSIDERABLE.
The Madison Range, southern Gallatin Range and the Lionhead area near West Yellowstone:
Faceted snow can be found on almost all slopes in the Madison and southern Gallatin Ranges and Lionhead area. To find it, you don't need a hand lens, just a shovel. The facets will crumble out of the pit wall as you dig. Although this snow structure is weak, without a rapid load of new snow the stability is good. Last night's three to four inches of fluff (.2 inches SWE) should not create natural avalanche activity. However, large facets on the ground along with layers of surface hoar and other small-grained facets in the upper two feet of the snowpack cannot be fully trusted. For today, it's still possible to trigger an avalanche and the Avalanche Danger is rated MODERATE.
The northern Gallatin Range and the Bridger Range:
The Bridger and northern Gallatin Ranges share a similar avalanche danger rating, but little else. The Bridgers are thin and weak. These mountains are not ready for the large dumps that must come someday. The northern Gallatins on the other hand, especially in the Hyalite area, are well nourished and fit. But its Achilles' heel is steep slopes, especially ones thin and rocky. On Saturday, a skier up Flanders drainage in Hyalite triggered a small slide when he jumped off a 3 to 4 foot rock band. He was caught, but not buried or injured. For today the Avalanche Danger remains MODERATE on slopes steeper than 35 degrees and a LOW Avalanche Danger on all other terrain.
NRCS Snowpack Summary Graphs:
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.
The Friends of the Avalanche Center installed a Beacon Training Park outside West Yellowstone. It's located south of town on the main snowmobile trail. Stop by and do a quick practice before heading off into the mountains!
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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