Daily Winter Weather Report
Date: Thursday - 05 January 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Snake River||27||-7||-4||0||34||-||Calm / Clear|
|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||Good||All oversnow vehicles|
|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||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 - drifts & ruts||All oversnow vehicles|
|Norris to Canyon||Open||Good||All oversnow vehicles|
|Norris to Madison||Open||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, WY
Today...Breezy. Partly cloudy. A 20 percent chance of snow in the afternoon. Highs 29°F to 35°F. Southwest winds 15 to 25 mph.
Tonight...Breezy. Mostly cloudy with a 40 percent chance of snow. Lows 6°F to 12°F. West winds 15 to 20 mph.
Friday...Mostly cloudy in the morning then becoming partly cloudy. A 20 percent chance of snow. Highs 21°F to 27°F. West winds around 15 mph late in the afternoon.
Friday Night...Partly cloudy with a 20 percent chance of snow. Lows 3°F to 9°F.
Saturday...Mostly cloudy with a 20 percent chance of snow. Highs 21°F to 27°F. West winds around 15 mph in the afternoon.
Saturday Night...Partly cloudy. Lows -1°F to 7°F.
Sunday...Partly cloudy. Highs 24°F to 30°F.
Sunday Night...Partly cloudy in the evening then clearing. Lows 8°F to 16°F.
Monday...Mostly sunny. Highs 27°F to 33°F.
Monday Night...Mostly clear in the evening then becoming partly cloudy. Lows 8°F to 14°F.
Tuesday...Mostly cloudy with a 20 percent chance of snow. Highs 23°F to 29°F.
Tuesday Night...Mostly cloudy with a 20 percent chance of snow. Lows 2°F to 8°F.
Wednesday...Partly cloudy. Highs 16°F to 22°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||44||Parker Peak||40|
|Blackwater||46||Snake River Station||28|
|Evening Star||45||Sylvan Road||24|
|Fisher Creek||51||Thumb Divide||25|
|Grassy Lake||40||Two Ocean Plateau||53|
|Lewis Lake Divide||38||West Yellowstone||19|
|Madison Plateau||30||Whiskey Creek||22|
from the Gallatin National Forest Avalanche Center - 05 January 2012 - 7:30 am - this report is by Mark Staples. This advisory does not apply to operating ski areas.
This morning temperatures were in the 30s Fahrenheit and winds were averaging 15-30 mph from the West and Southwest gusting 35-50 mph. This morning will remain warm and windy. Clouds will move over the area and by afternoon bring cooler air which will keep temperatures in the 30s Fahrenheit. Winds shouldn't ease until this evening, and some areas could receive a dusting or even an inch of snow by tomorrow morning.
* AVALANCHE INCIDENTS *
We have posted many photos and several videos from the two avalanche fatalities outside Cooke City. Full reports will be made public later this week.
GOOD NEWS: In the avalanche in Hayden Creek south of Cooke City, a dog (a Corgi) was caught and presumed to be buried and dead. However, yesterday afternoon this dog appeared at the Antlers Lodge outside the hotel room where the victim and his wife were staying. Residents of Cooke City helped reunite this dog with its family.
Snowpack and Avalanche Discussion:
The Bridger, Madison and Gallatin Ranges, the Lionhead area near West Yellowstone and the mountains around Cooke City:
Unstable conditions persist and recent warm weather has not changed the situation. The structure of the snowpack remains the same. A heavy slab of snow rests on a snowpack containing weak, faceted layers that will fracture and produce an avalanche. Evidence of this instability:
• Yesterday near Cooke City a skier experienced lots of collapsing, a clear sign that the snowpack remains unstable.
• On Lionhead near West Yellowstone, Karl Birkeland was studying fracture mechanics by filming his stability tests with a high speed camera. His test results showed unstable conditions. He also experienced collapsing and cracking. If the slope had been steeper than 30 degrees or connected to a steeper slope it would have avalanched.
• In the Bridger Range, the Bridger Bowl ski patrol continues to trigger avalanches in terrain that has very similar conditions to the backcountry.
• Near Big Sky in Beehive Basin yesterday, a skier found new snow resting on very weak, faceted, old snow. His stability test results mirrored Karl's on Lionhead. Even though he saw ski tracks on the slope, he did not ski it.
The problem now is that the snowpack might let a skier or rider take a chance and get lucky. A recent video near Jackson Hole is a good example. The first skier got very lucky and did not trigger an avalanche, but 10 minutes later a snowboarder easily triggered the entire face. For today, human triggered avalanches remain likely and the Avalanche Danger is rated CONSIDERABLE.
The northern Gallatin Range:
Stability is better in the northern Gallatin Range. Yesterday Eric and his partners were skiing in Hyalite where they found a good bond between this weekend's snow and the old snow surface. They also found obvious facets near the ground, but thought it would be difficult to trigger an avalanche on this layer unless you found an area with a thinner snowpack like steep rocky slopes. They also saw evidence of a large cornice that broke and hit the slope below, but it did not trigger an avalanche – a good sign. Some areas have a layer of surface hoar buried about a foot deep. I found it on Mount Ellis and did not ski steeper open areas under the burn based on the existence of this layer. Skiers near Lick Creek also found a buried surface hoar layer and opted for lower angle terrain. With buried surface hoar on some slopes and the existence of facets near the ground, human triggered avalanches are possible and the Avalanche Danger is MODERATE.
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.
EVENTS, EDUCATION, 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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