Daily Winter Weather Report
Date: Thursday - 22 December 2011
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Canyon||18||-22||-20||.5||18||OC||Calm / Foggy|
|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||CLOSED||CLOSED||CLOSED|
|Firehole Canyon Drive||CLOSED||CLOSED||CLOSED|
|Grant to South Entrance||Open||All oversnow vehicles|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||CLOSED||CLOSED||CLOSED|
|Lake to West Thumb||CLOSED||CLOSED||CLOSED|
|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||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 ********
Canyon North and South Rim Drives are open for rubber tracked vehicle only.
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, WY
Today: Mostly sunny, with a high near 14°F and a low around -17°F. Wind chill values as low as -30°F.
Friday: Mostly sunny, with a high near 17°F and a low around -8°F. Wind chill values as low as -35°F. Southwest wind around 8 mph.
Saturday: Mostly sunny, with a high near 21°F and a low around 4°F. South southwest wind between 8 and 10 mph.
Sunday / Christmas Day: Mostly sunny, with a high near 27°F and a low around 6°F. South southwest wind between 7 and 13 mph, with gusts as high as 20 mph.
Monday: A 20 percent chance of snow. Mostly sunny, with a high near 22°F and a low around 3°F.
Tuesday and Wednesday: A chance of snow. Partly sunny, with highs near 22°F and lows around 7°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||42||Parker Peak||36|
|Blackwater||41||Snake River Station||23|
|Evening Star||36||Sylvan Road||19|
|Fisher Creek||41||Thumb Divide||20|
|Grassy Lake||35||Two Ocean Plateau||45|
|Lewis Lake Divide||32||West Yellowstone||17|
|Madison Plateau||28||Whiskey Creek||22|
from the Gallatin National Forest Avalanche Center - December 22, 2011 - this report is by Doug Chabot. This advisory does not apply to operating ski areas.
Since yesterday morning an additional 6 to 10 inches of snow fell in the Gallatin and Madison Ranges while the Bridger Range and Cooke City got an inch at most. Temperatures this morning were in single digits Fahrenheit and northerly winds calmed to 5-10 mph with some gusts of 15 mph. During the storm yesterday winds blew stronger at 15-30 mph sometimes from the East. Skies began clearing overnight and today will be mostly sunny with temperatures rising into the low teens Fahrenheit. Winds will remain northerly at 5-10 mph with some gust up to 20 mph.
Snowpack and Avalanche Discussion:
The Madison and Gallatin Ranges, and the Lionhead area near West Yellowstone:
Sometimes avalanche forecasting is easy and today is one of those times. Yesterday's snow combined with a weak snowpack will produce avalanches. Total snowfall for the storm was:
• 15 inches in Hyalite Canyon (0.8 inch SWE)
• 10 to 12 inches on Lone Mountain at Big Sky (0.4-0.8 inch SWE)
• 10 inches near the Taylor Fork drainage (0.5 inch SWE)
• 6 to 7 inches near West Yellowstone (0.3-0.4 inch SWE)
Most areas have weak, faceted snow crystals throughout the snowpack which will not support the load of yesterday's snowfall. Some slopes produced avalanches on their own and many others are waiting for skier or rider to trigger an avalanche. The most sensitive slopes will be ones with wind deposited snow. Some strong easterly winds yesterday loaded slopes that often do not receive wind-blown snow. Even though winds have calmed this morning, it did not take very strong winds to transport yesterday's low density snow.
The snowpack in and near Hyalite Canyon is generally stronger but this area received the most snow; therefore, this snowpack has the most stress. During the storm yesterday, skiers near Hyalite Lake found 2 natural avalanches and experienced collapsing of the snowpack, both signs of unstable snow.
For today, a HIGH Avalanche Danger exists on all wind loaded slopes where both natural and human triggered avalanches are likely. A CONSIDERABLE Avalanche Danger exists on all other slopes.
The Bridger Range and the mountains around Cooke City:
The Bridger Range and the mountains near Cooke City only received 2 to 3 inches of snow. With less new snow there will be fewer avalanches. The snowpack in the Bridger Range is incredibly weak and completely faceted. Near Cooke City the snowpack is much deeper and generally stronger but near the snow surface it has some facets that can produce avalanches. In both these areas watch for recently wind loaded slopes. These slopes may not produce very large avalanches but will easily break if you ski or ride on them. Today a CONSIDERABLE Avalanche Danger exists on all wind loaded slopes. All other slopes have a MODERATE Avalanche Danger.
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
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.
Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center
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