Daily Winter Weather Report
Date: Sunday - February 20, 2011
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Canyon||32||0||1||4||48||OC||Calm / lite snow|
|East Entrance||33||3||3||4||40||OC||E@3mph / moderate snow|
|Lake||34||9||11||3.5||48||OC||Calm / snowing|
|Mammoth||27||-2||0||1.5||19||OC||SE@0-2mph / lite snow|
|Old Faithful||30||6||9||3||40||OC||Calm / lite snow|
|Snake River||30||0||19||5.5||54||OC||Calm / moderate snow|
|Tower||27||-1||-1||T||28||OC||NNW@6mph / gust 8mph|
|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||Poor||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||Open||Fair||Oversnow|
|Norris to Canyon||Open||Fair||Oversnow|
|Norris to Madison||Open||Good||Oversnow|
|Old Faithful to Grant||Open||Poor||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...Snow. Snow accumulation of 2 to 3 inches. Total snow accumulation 2 to 4 inches. Highs 21°F to 27°F. East winds around 15 mph shifting to the southwest early in the afternoon...then shifting to the west late in the afternoon. Chance of snow 90 percent.
Tonight...Cloudy with a 50 percent chance of snow. Lows 3°F to 9°F. West winds around 15 mph early in the evening becoming southwest around 15 mph after midnight.
Presidents' Day / Monday...Breezy. Mostly cloudy. Slight chance of snow in the morning...then chance of snow in the afternoon. Areas of blowing snow in the afternoon. Highs 17°F to 23°F. Southwest winds 15 to 20 mph. Chance of snow 40 percent.
Presidents' Day / Monday Night...Breezy. Mostly cloudy with a 30 percent chance of snow. Areas of blowing snow. Lows 3°F to 9°F. Southwest winds 15 to 20 mph.
Tuesday...Breezy...cloudy. Chance of snow in the morning...then snow likely in the afternoon. Snow accumulation of 1 to 2 inches. Highs 20°F to 26°F. Southwest winds 15 to 25 mph. Chance of snow 60 percent.
Tuesday Night...Breezy. Mostly cloudy with a 50 percent chance of snow. Lows 1°F to 7°F. Wind chill readings -13°F to -23°F.
Wednesday...Mostly cloudy with a 50 percent chance of snow. Highs 13°F to 19°F.
Wednesday Night...Colder. Mostly cloudy with a 40 percent chance of snow. Lows -2°F to -8°F.
Thursday...Mostly cloudy with a 50 percent chance of snow. Highs 5°F to 11°F.
Thursday Night...Partly cloudy with a 50 percent chance of snow. Lows -7°F to -13°F.
Friday...Mostly cloudy with a 50 percent chance of snow. Highs 10°F to 16°F.
Friday Night...Mostly cloudy with a 50 percent chance of snow. Lows -1°F to -9°F.
Saturday...Mostly cloudy with a 30 percent chance of snow. Highs 12°F to 18°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||99||Parker Peak||78|
|Blackwater||59||Snake River Station||-|
|Evening Star||76||Sylvan Road||42|
|Fisher Creek||94||Thumb Divide||53|
|Grassy Lake||80||Two Ocean Plateau||73|
|Lewis Lake Divide||79||West Yellowstone||45|
|Madison Plateau||68||Whiskey Creek||56|
from the Gallatin National Forest Avalanche Center - February 20, 2011 - this report is by Eric Knoff
A closed Low over Wyoming has produced east winds throughout our advisory area limiting snow accumulations. Over the past 24 hours, 3-4 inches of low density snow has fallen in the southern ranges while a trace to 1 inch has fallen in the north. Temperatures are much colder in the mountains around Bozeman with Bridger Bowl recording the lowest temperature of -7 Fahrenheit. Conditions warm steadily farther south. West Yellowstone is the warm spot at 21 Fahrenheit while the mountains around Big Sky and Cooke City are recording temps around 10 Fahrenheit. Currently, winds are blowing out of the South-South-Eeast at 5-15 mph and should gradually switch to more westerly flow by this afternoon. Today, temperatures will struggle into the single digits in the north and low 20s in the south. Another 2-3 inches will fall in the mountains around West Yellowstone and Cooke City while the north will pick up an inch or two.
Snowpack and Avalanche Discussion:
The Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
The primary issue today will be wind slabs that have been formed by strong winds over the past few days. Prior to this latest storm the dominating wind direction has been from the WSW, which loaded north and east facing slopes. Over the past 24 hours the winds have switched and are now blowing out of the South-south-east, loading slopes that were previously scoured. This will add a twist to snowpack and terrain assessment.
Soft slab avalanches near the ridgelines will be today's primary avalanche concern. Without a widespread weak layer these slabs should not propagate far and will likely stay confined to the new snow. They will mainly be a problem in terrain where small slides have the potential to sweep a skier or rider over rocks, into trees, or into confined gullies amplifying the consequences of a small slide.
A secondary concern is that fresh wind slabs may be resting on older hard slabs that formed during very high winds a few weeks ago. Triggering a hard slab avalanche will be difficult, but the consequences will likely be severe. Detecting and avoiding large wind rolls and high probability trigger points such as mid-slope rock bands and steep, convex rolls will limit the chances of triggering a hard slab.
Today, fresh snow and wind will make human triggered avalanches likely on all wind loaded slopes and slopes steeper than 35 degrees where the Avalanche Danger is rated CONSIDERABLE. Slopes less than 35 degrees that have not received a wind load have a MODERATE Avalanche Danger.
The Bridger Range:
Without a widespread weak layer the main stability issue for the Bridger Range will be wind loaded slopes. With very little snow over the past few days new snow avalanches will likely be manageable in size. The biggest concern will be triggering an older hard slab, which will be possible on north and east facing slopes. A hard slab avalanche was responsible for a fatality on the west side of the Bridgers last Monday. Steer clear of large pillow like drifts, especially if the snow feels hollow or sounds like a drum. Above all, use good backcountry procedures and always think about the consequences of triggering an avalanche.
Today, human triggered avalanches are possible and the Avalanche Danger is rated MODERATE.
Truman Avalanche Report:
The report on the avalanche fatality from February 14th in Truman's Gulch on the west side of the Bridger Range is posted online. You can read it here: http://www.mtavalanche.com/accident/11/02/18.
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.
3rd Annual Montana Ale Works Fundraiser
When & Where: March 1, Tuesday at 6:00 p.m. in the Railcar.
Cost: $20 to benefit the Friends of the Avalanche Center
Details: Chef Roth at Montana Ale Works is creating tapas style servings that will be paired with select beer from Lone Peak Brewery. More information HERE.
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
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