Daily Winter Weather Report
Date: Tuesday - February 15, 2011
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Madison||42||19||24||0||30||SC||Calm / Clear|
|Mammoth||45||34||45||0||18||SC||S@11mph / gust 17mph|
|Old Faithful||44||14||33||0||28||SC||Calm / Clear|
|West Entrance||44||20||30||0||36||SC||Windy / 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||Fair||STR|
|Beartooth Highway||CLOSED *||CLOSED *||CLOSED *|
|Canyon to Lake||Open||Poor||Oversnow|
|Firehole Canyon Drive||Open||-||Oversnow - Snowcoaches only in the morning|
|Grant to South Entrance||Open||-||Oversnow|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||Open||Good||Oversnow|
|Lake to West Thumb||Open||-||Oversnow|
|Madison to Old Faithful||Open||Good||Oversnow|
|Madison to West Yellowstone||Open||-||Oversnow|
|Mammoth to Norris||Open||Good||Oversnow|
|Norris to Canyon||Open||Good||Oversnow|
|Norris to Madison||Open||Good||Oversnow|
|Old Faithful to Grant||Open||-||Oversnow|
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 ********
by the National Weather Service Riverton, WY
Today...Breezy. Mostly cloudy. Slight chance of snow in the morning...then slight chance of rain and snow in the afternoon. Highs 33°F to 39°F. Southwest winds 15 to 25 mph. Chance of precipitation 20 percent.
Tonight...Breezy. Mostly cloudy with a 40 percent chance of snow. Lows 19°F to 25°F. Southwest winds 15 to 20 mph.
Wednesday...Breezy. Chance of snow in the morning...then snow likely in the afternoon. Snow accumulation of 2 to 3 inches. Highs 30°F to 36°F. Southwest winds 15 to 20 mph. Chance of snow 60 percent.
Wednesday Night...Snow. Snow accumulation of 4 to 6 inches. Lows 14°F to 20°F. Southwest winds around 15 mph. Chance of snow 80 percent.
Thursday...Snow likely. Snow accumulation of 2 to 3 inches. Total snow accumulation 8 to 12 inches. Highs 19°F to 25°F. West winds around 15 mph. Chance of snow 70 percent.
Thursday Night...Colder. Mostly cloudy with a 40 percent chance of snow. Lows 0°F to 6°F.
Friday...Mostly cloudy with a 20 percent chance of snow. Highs 20°F to 26°F. Lowest wind chill readings -11°F to -21°F in the morning.
Friday Night...Mostly cloudy with a 20 percent chance of snow. Lows 5°F to 11°F.
Saturday...Mostly cloudy with a 30 percent chance of snow. Highs 24°F to 30°F.
Saturday Night...Mostly cloudy with a 30 percent chance of snow. Lows 8°F to 14°F.
Sunday...Mostly cloudy in the morning then becoming partly cloudy. A 20 percent chance of snow. Highs 22°F to 28°F.
Sunday Night...Cloudy with a 30 percent chance of snow. Lows 4°F to 10°F.
Presidents' Day / Monday...Mostly cloudy with a 20 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||89||Parker Peak||76|
|Blackwater||59||Snake River Station||-|
|Evening Star||72||Sylvan Road||41|
|Fisher Creek||89||Thumb Divide||47|
|Grassy Lake||76||Two Ocean Plateau||69|
|Lewis Lake Divide||72||West Yellowstone||37|
|Madison Plateau||59||Whiskey Creek||47|
from the Gallatin National Forest Avalanche Center - February 15, 2011 - this report is by Doug Chabot
Yesterday was gorgeous with sunny skies, mountain temperatures in the mid thirties and westerly winds at 20-30 mph. Today will start out sunny, but clouds will roll in late this afternoon. Mountain temperatures will reach 40 Fahrenheit in the mountains from the high 20s Fahrenheit this morning. Winds increased overnight and are currently blowing west to southwest at 30 mph with gusts reaching 50 mph. Wind, warmth and sun will hopefully give way to cold, clouds and snow sometime tomorrow. The mountains could use a facelift.
Snowpack and Avalanche Discussion:
The Bridger Range, The Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
I am sad to report that a 22 year old male snowboarder died in an avalanche yesterday. He and his partner ascended Truman Gulch on the west side of the Bridger Range. They stopped about 200 feet from the ridgetop, dug two snowpits and decided to stay on the northern edge of the large avalanche path at the head of the drainage since this side was not wind-loaded. The partner descended first. The victim came second and skied toward an adjacent gully to the north where he triggered a hard wind slab. The avalanche reportedly broke 2-3 feet deep, 40-50 feet wide and ran at least 700 feet down the steep gulley. The victim was located and probed by his partner. Bridger Bowl Ski Patrol assisted digging him out, but he did not survive. We will be investigating the avalanche site today and post a detailed accident investigation later in the week.
Hard slabs of wind deposited snow formed during the hurricane force winds on Saturday through Sunday morning. There were many natural avalanches during this wind storm with many north to east aspects getting loaded at all elevations. These slabs of dense, chalky snow are on many slopes, but they are bonded and unmovable on a great percentage of these--but not all. Eric only found thin wind slab avalanches releasing in Lionhead, which was similar to what a skier saw outside Cooke City. It's imperative to test the exact slope you intend to descend. A hard slab in one gully may be stuck in place while an adjacent one will avalanche. With the slabs getting harder to trigger, the avalanche danger is decreasing. We are happy to see this, but without obvious signs of instability analyzing the slope is important.
Although wind-loading is our paramount concern, there are two lesser ones to keep in mind too. A layer of facets one to two feet under the surface is visible to the naked eye. This layer has strengthened and has not propagated a fracture in our stability tests lately, but it could still surprise us. The other concern is on thin snows less than four feet deep where the lower half of the pack is nothing but unbonded, sugary facets. Sinking to the ground with a simple step is a big clue to head elsewhere. I found this in one of my three pits near Taylor Fork in the southern Madison on Sunday. Skiers touring in the southern Gallatin Range on Sunday experienced collapses on a thin snowpack too.
Wind-loaded slopes should be approached with caution since hard slab avalanches are a nasty beast. It's still possible to trigger slides and the Avalanche Danger is rated MODERATE.
Wet Avalanche Danger
Mountain temperatures are expected to reach 40+ Fahrenheit degrees today. The snow on sunny, south facing slopes will get moist at the surface. I expect wet point release avalanches on slopes getting direct, intense solar radiation today. Rock outcroppings absorb the heat and are prone to moisten the snow around them at a fast clip.
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.
West Yellowstone: Beacon Park Operational
Skiing or riding near West Yellowstone? Test your beacon skills at a beacon park near the old airport where you can search for pre-placed beacons switched on/off by a control panel. Look for it by orange snow fence and signage just south of the snow cross track.
Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center
|I n d e x|
|Adult Programs||Entrances||Old Faithful Live WebCam||Visitor Stats|
|Amphibians||Entrance Fees||Pets||Volcano Observatory|
|Animals||Fall Closure||Phone Numbers||Waterfalls|
|Bear Management||Fishing Fees||Ranger Led Activities||WebCams|
|Bear Sightings||Fishing Regulations||Reptiles||Wildflowers|
|Biking||Getting Here||Reunions||Winter Closing|
|Boating||Hiking||Rivers, Creeks & Streams||Winter Opening|
|Books||History||Roads||Winter Weather Reports|
|Butterflies||Junior Ranger Program||Schedule||Wolf Project|
|Camping||Lakes||Search Page||Wolf Sightings|
|Campground Maps||Location||Spring Opening||Wolverine Help|
|Challenges||Lodging||Star Talks||Yellowstone ~ the Name|
|Chat Page||Lynx Help||Trip Planner pdf||Young Scientist|
|Clinics / Medical||Mammal List||Trip Reports||Youth Conservation Corps|
|Yellowstone National Park WebCams|
|Old Faithful Live||All Old Faithful||Old Faithful Static||Old Faithful VC||North Entrance||Mt Washburn||Mammoth||YVO WebCam|
|Yellowstone Area Highway WebCams|
|Alpine Junction Hwy 89 (South)||Monida Pass I-15 (North)|
|Bozeman Pass I-90 (North)||Osborne Bridge Hwy 20 (West)|
|Henry's Lake North Hwy 20 (West)||Raynolds Pass MT 87 (North or West)|
|Henry's Lake South Hwy 20 (West)||Teton Pass WY 22 (South)|
|State Road Reports|
|Gardiner, Montana||Silver Gate, Montana||West Yellowstone, Montana||Cooke City, Montana|
|Livingston, Montana||Cody, Wyoming||Jackson Hole, Wyoming||Yellowstone National Park|
|The Great Outdoors Net||Great Outdoor Recreational Places|
|Gardiner, Montana||World Humanity|
by John William Uhler
Back to: Yellowstone Up Close and Personal