Daily Winter Weather Report
Date: Wednesday - March 09, 2011
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Canyon||26||4||16||1||48||OC||Calm / lite snow|
|Grant Village||30||-1||14||T||60||-||Calm / clear|
|Old Faithful||26||10||20||1.5||38||OC||NE@2-4mph / snowing|
|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||Fair||Oversnow|
|Firehole Canyon Drive||Open||-||Oversnow - Snowcoaches only in the morning|
|Grant to South Entrance||Open||Good||Oversnow|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||CLOSED *||CLOSED *||CLOSED *|
|Lake to West Thumb||Open||Fair||Oversnow|
|Madison to Old Faithful||Open||Good||Oversnow|
|Madison to West Yellowstone||Open||Good||Oversnow|
|Mammoth to Norris||CLOSED *||CLOSED *||CLOSED *|
|Norris to Canyon||Open||Fair||Oversnow|
|Norris to Madison||Open||Good||Oversnow|
|Old Faithful to Grant||Open||Good||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...cloudy. Slight chance of snow in the morning... Then chance of snow and rain in the afternoon. Highs 31°F to 37°F. Southwest winds 15 to 20 mph. Chance of precipitation 30 percent.
Tonight...Breezy. Chance of snow in the evening...then snow likely after midnight. Snow accumulation of 2 to 3 inches. Lows 19°F to 25°F. Southwest winds 15 to 25 mph. Chance of snow 60 percent.
Thursday...Breezy. Mostly cloudy. Chance of snow in the morning... Then chance of rain and snow in the afternoon. Highs 37°F to 43°F. Southwest winds 15 to 25 mph. Chance of precipitation 40 percent.
Thursday Night...Windy...snow. Snow accumulation of 2 to 4 inches. Lows 14°F to 20°F. Southwest winds 25 to 30 mph decreasing to 15 to 25 mph after midnight. Chance of snow 80 percent.
Friday...Breezy...colder...cloudy. Chance of snow in the morning... Then scattered snow showers in the afternoon. Highs 24°F to 30°F. West winds 15 to 20 mph. Chance of snow 50 percent.
Friday Night...Mostly cloudy with a 20 percent chance of snow. Lows 10°F to 16°F.
Saturday...Not as cold. Mostly cloudy with a 20 percent chance of snow. Highs 32°F to 38°F.
Saturday Night...Cloudy with a 30 percent chance of snow. Lows 14°F to 20°F.
Sunday...Mostly cloudy with a 20 percent chance of snow. Highs 32°F to 38°F.
Sunday Night...Partly cloudy with a 20 percent chance of snow. Lows 12°F to 18°F.
Monday...Mostly cloudy. Chance of snow in the morning...then chance of snow and rain in the afternoon. Highs 31°F to 37°F. Chance of precipitation 40 percent.
Monday Night...Mostly cloudy with a 40 percent chance of snow. Lows 14°F to 20°F.
Tuesday...Mostly cloudy with a 20 percent chance of snow. Highs 30°F to 36°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||111||Parker Peak||85|
|Blackwater||73||Snake River Station||46|
|Evening Star||87||Sylvan Road||48|
|Fisher Creek||106||Thumb Divide||58|
|Grassy Lake||107||Two Ocean Plateau||-|
|Lewis Lake Divide||102||West Yellowstone||47|
|Madison Plateau||75||Whiskey Creek||58|
from the Gallatin National Forest Avalanche Center - March 09, 2011 - this report is by Doug Chabot. This advisory does not apply to operating ski areas.
Lingering showers yesterday morning and a bit more last night accumulated five inches near Big Sky, and two to three inches everywhere else. West winds increased at the ridge tops and have averaged 25-30 mph with gusts to 40 mph. Temperatures are currently in the low teens after reaching the mid 20s Fahrenheit yesterday. Later today, mostly sunny skies will cloud over as mountain temperatures rise into the low 30s Fahrenheit and winds blow west to southwest at 25-35 mph. A trace to one inch of snow may fall in the southern mountains tonight, but a dry high pressure ridge is keeping significant snowfall at bay.
Snowpack and Avalanche Discussion:
The Bridger, Madison and Gallatin Ranges, and the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
Today's avalanche forecasting challenge is an easy one and can be summed up in two words: wind-loading. Yesterday were the first strong winds that blew since the weekend's snow. Low density powder covered the mountains from a depth of six inches up north to twenty inches around Cooke City. Yesterday, by early afternoon, soft slab avalanches were releasing naturally near the ridgelines. This was witnessed by the ski patrols around Lone Mountain as well as Mark and another party in the northern Bridger Range.
Mark toured above Fairy Lake and to the Great One on Sacajewea. The winds were moving impressive amounts of snow near the ridge top. Winds also swirled mid mountain and formed thin slabs that easily cracked on the lower density snow underlying it. Mark's snowpits confirmed that instabilities were limited to the new windblown snow. A skier the day before found feathery, weak crystals of surface hoar immediately north of Bridger Bowl (now buried under the new snow), but Mark did not find it. Small grains of faceted snow were also seen near Big Sky and Cooke City. None of these layers seem widespread, but they're worth knowing about since wind slabs will pop even easier on them. Eric and I investigated a slide on Sunday in the southern Madison Range with this recipe. Thick, hard, wind slabs avalanched on a thin layer of facets when a skier knocked a cornice off triggering the slope.
Within a few hours of the winds starting to blow yesterday, small natural avalanches were seen. Since then, the winds have continued blowing at a steady clip which has only increased the likelihood of avalanches. Cornices will be sensitive to breaking and wind slabs will be easily triggered.
For today, all wind-loaded slopes have a CONSIDERABLE Avalanche Danger. Slopes not affected by the wind will have great powder and a LOW Avalanche Danger.
PHOTOS, SNOWPITS, VIDEO and SURVEY RESULTS
3. The results from our survey are posted online. Thanks to all who participated. You can check out the results at http://bit.ly/fpLuSi.
In response to our survey we added a new page to the website with images of our snowpit profiles. This page is under the Resources/Other Info tab at http://fsavalanche.org/Encyclopedia/snowpit.htm
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
|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