Daily Winter Weather Report
Date: Monday - 12 March 2012
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|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||CLOSED *||CLOSED *||CLOSED *|
|Canyon to Tower||CLOSED *||CLOSED *||CLOSED *|
|Firehole Canyon Drive||CLOSED||CLOSED||CLOSED|
|Grant to South Entrance||Open||Good||All oversnow vehicles|
|Junction to Chief Joseph Hwy||CLOSED *||CLOSED *||CLOSED *|
|Lake to East Entrance||CLOSED *||CLOSED *||CLOSED *|
|Lake to West Thumb||Open||Good||All oversnow vehicles|
|Madison to Old Faithful||Open||Good||All oversnow vehicles|
|Madison to West Yellowstone||Open||Good||All oversnow vehicles|
|Mammoth to Norris||CLOSED *||CLOSED *||CLOSED *|
|Norris to Canyon||CLOSED *||CLOSED *||CLOSED *|
|Norris to Madison||CLOSED *||CLOSED *||CLOSED *|
|Old Faithful to Grant||Open||Good||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 ********
* Boiling River Hours - 5:00 AM to 9:00 PM
* The Grand Loop Road from Mammoth to Norris Junction, Norris to Canyon, Canyon to Fishing Bridge, Norris to Madison and Lake Butte Drive to the East Entrance have closed for the season.
* The East Entrance Road from the East Entrance to Lake Butte has closed to public oversnow travel for the season (01 March 2012).
* The Grand Loop Road from Mammoth to Norris Junction closed for the season Sunday evening (04 March 2012).
* The road from Norris Junction to Madison, and Norris Junction to Canyon closes tonight at 9:00 PM (06 March 2012).
* The Mammoth Hotel, Dining Room, and Gift Shop close today (06 March 2012).
* The Old Faithful Snowlodge, cabins, and dining room closed for the season on Sunday (11 March 2012).
* The Geyser Grill and Old Faithful Visitor Center remain open through March 15.
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
Today: A 20% chance of snow showers before noon. Breezy, with a southwest wind between 22 and 24 mph, with gusts as high as 34 mph. Mostly cloudy, with a high near 39°F.
Tonight: Breezy, with a southwest wind between 20 and 23 mph, with gusts as high as 33 mph. Mostly cloudy, with a low around 24°F.
Tuesday: A slight chance of snow before noon, then a chance of rain. Breezy, with a southwest wind between 20 and 28 mph, with gusts as high as 39 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible. Cloudy, with a high near 42°F.
Tuesday Night: Snow likely, mainly after midnight. Breezy, with a southwest wind between 22 and 25 mph, with gusts as high as 36 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible. Mostly cloudy, with a low around 25°F.
Wednesday: Snow likely before noon, then rain likely. Breezy, with a southwest wind between 16 and 22 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible. Mostly cloudy, with a high near 42°F.
Wednesday Night: A 40% chance of snow. Southwest wind around 14 mph. Mostly cloudy, with a low around 25°F.
Thursday: A 30% chance of snow showers. Southwest wind between 11 and 14 mph, with gusts as high as 21 mph. Mostly cloudy, with a high near 42°F.
Thursday Night: A 40% chance of snow showers. Mostly cloudy, with a low around 25°F.
Friday: Snow showers likely. Chance of precipitation is 60%. Mostly cloudy and breezy, with a high near 40°F.
Friday Night: A 50% chance of snow showers. Mostly cloudy, with a low around 18°F.
Saturday: A chance of snow showers. Mostly cloudy, with a high near 33°F.
Saturday Night: A chance of snow showers. Mostly cloudy, with a low around 11°F.
Sunday: A chance of snow showers. Mostly cloudy, with a high near 32°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||101||Parker Peak||70|
|Blackwater||74||Snake River Station||61|
|Evening Star||85||Sylvan Road||42|
|Fisher Creek||90||Thumb Divide||50|
|Grassy Lake||94||Two Ocean Plateau||87|
|Lewis Lake Divide||88||West Yellowstone||41|
|Madison Plateau||66||Whiskey Creek||53|
from the Gallatin National Forest Avalanche Center - 12 March 2012 - 7:30 am - this report is by Eric Knoff. This advisory does not apply to operating ski areas.
Since early this morning a fast moving storm has dropped nine inches of snow in the Bridger Range, 2 to 3 inches in the northern Madison and Northern Gallatin Ranges and a trace to one inch elsewhere. Currently, mountain temperatures are in the teens Fahrenheit around Big Sky and low to mid-twenties Fahrenheit over the rest of our advisory area. Winds are blowing 15-30 mph out of the West-southwest with gusts reaching close to 40 mph. Today, temperatures will warm into the high 20s to low 30s Fahrenheit and winds will continue to blow 25-35 mph out of the West-southwest. Snow will end late this morning but skies will remain mostly cloudy through the day. A warm and dry pattern will settle in this afternoon and remain in place through tomorrow.
Snowpack and Avalanche Discussion:
The Bridger Range:
The primary concern for the Bridger Range will be wind slabs. Nine inches of new snow combined with strong upper elevation winds will make slab development most prominent below the ridgelines. West-southwest winds will make slopes on the east half of the compass most susceptible to wind loading. Slabs triggered high on the slope have the ability to entrain large volumes of snow and run long distances.
A secondary concern will be avalanches breaking on deeper layers in the snowpack. Slides initiated within the storm snow have the potential to step down to faceted layers buried 2 to 3 feet deep. Steep, rocky terrain will be the most likely to produce deeper avalanches.
Today, human triggered avalanches are likely on wind loaded slopes which have a CONSIDERABLE Avalanche Danger. Non-wind loaded slopes have a MODERATE Avalanche Danger.
The northern Madison Range:
The northern Madison Range has the weakest snow in our forecast zone. Over the past week multiple natural and human triggered avalanches have been reported in this area (photo, photo). Yesterday, Doug and I went on the hunt for weak snow in the mountains around Big Sky. Doug and his partners explored the Big Sky sidecountry while my partner and I assessed conditions on Yellow Mountain (video). Although we were miles apart, we found very similar conditions with the weakest snow being on east and south facing slopes. We both got columns to propagate with medium force on the facet layer buried two feet deep and Doug also got a column to propagate on the depth hoar near the ground.
Although the northern Madison Range only received three inches of new snow, strong winds out of the west-southwest will be loading leeward slopes. Fresh wind slabs will likely be forming over a firm ice crust, which will provide a smooth surface for slides to run. Avalanches initiated in the new snow could step down to faceted layers buried deeper in the snowpack.
Today, new snow and strong winds will make human triggered avalanches likely on wind loaded slopes steeper than 35 degrees which have a CONSIDERABLE Avalanche Danger. All other slopes have a MODERATE Avalanche Danger.
The Southern Madison and Gallatin Ranges, the mountains around Cooke City and the Lionhead area near West Yellowstone:
Dust on crust, lipstick on a pig – however you look at it riding conditions will be highly variable today. As cloudy conditions and cooler temps replace the warm-dry weather of the past five days, our primary concern will continue to be the weak, faceted layer buried 2 to 3 feet deep.
On Saturday Mark and I rode in the Taylor Fork and found this layer to be reactive in stability tests (video). Although it was taking hard force to get this layer to fail, it continuously demonstrated its ability to propagate. We also know this layer exists in the Gallatin Range (photo), mountains around Cooke City (photo) and Lionhead area near West Yellowstone.
The most likely areas to trigger a slide today will be on unsupported terrain features such as steep rollovers or in steep rocky terrain where the snowpack is shallow.
Buried persistent weak layers will continue to make human triggered avalanches possible and the Avalanche Danger is rated MODERATE.
Recent avalanche in Utah
A snowmobiler was caught and buried in an avalanche in Utah on Sunday. He was not wearing a beacon and was buried for about 20 minutes. He was incredibly lucky. Few people buried this long survive. Also, notice a recent avalanche on the adjacent slope. Recent avalanches are clear signs of unstable conditions: http://vimeo.com/38078462.
* * Accident Report * *
The accident reports for the avalanche fatality near Cooke City and the slide on Saddle Peak are now available. See this link.
* * * Last Saturday Francis Skierka from Cut Bank, Montana died in an avalanche in northwestern Montana near Marias Pass. Sadly his wife, Andrea, is pregnant and due in two months. A memorial fund to help Andrea and her baby has been established: The Francis Skierka Family Memorial, Stockman Bank, 125 West Main, Cut Bank MT 59427, 406-873-9400. * * *
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.
For Audio, Photos, Videos, and More Detailed Information related to this report, Please Visit the Gallatin National Forest Avalanche Center.
~ EVENT ~
Come to Bridger Bowl on Saturday, March 17th (Saint Patrick's Day) with telemark skis, AT skis, alpine skis, snowboards, split boards, or even snow blades. The theme is Snowpocalypse based on the wildly popular Mayan 2012 apocalypse. $30 gets you into the races, a pint glass, t-shirt, a good time, a raffle ticket, and food by Cafe Fresco. Pre-register at Mystery Ranch or Grizzly Ridge: March 11-16. Visit http://pinheadclassic.com/ or the Pinhead Facebook Page for more info.
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 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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