Daily Winter Weather Report
Date: Monday - February 28, 2011
|Station||Max Temp||Min Temp||Pres Temp||New Snow||Depth||Sky||Present Conditions|
|Canyon||17||-8||10||T||47||OC||Calm / lite snow|
|Old Faithful||18||5||15||0||39||OC||S@15-20mph / snowing|
|West Entrance||20||0||15||1||50||OC||Calm / lite snow|
|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||Open||Fair||Oversnow|
|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||Good||Oversnow|
|Norris to Canyon||Open||Good||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...Windy. Cloudy with a 50 percent chance of snow. Areas of blowing snow. Highs 23°F to 29°F. Southwest winds 20 to 30 mph with gusts to around 45 mph increasing to 30 to 35 mph with gusts to around 50 mph in the afternoon.
Tonight...Windy. Cloudy with a 50 percent chance of snow. Areas of blowing snow. Lows 12°F to 18°F. Southwest winds 25 to 35 mph.
Tuesday...Windy...cloudy. Snow likely in the morning...then chance of snow in the afternoon. Areas of blowing snow through the day. Snow accumulation around 1 inch. Highs 27°F to 33°F. Southwest winds 25 to 30 mph decreasing to 15 to 25 mph in the late morning and afternoon. Chance of snow 70 percent.
Tuesday Night...Breezy. Mostly cloudy with a 20 percent chance of snow. Lows 10°F to 16°F. Southwest winds 15 to 20 mph.
Wednesday...Breezy. Mostly cloudy. Slight chance of snow in the morning...then chance of snow in the afternoon. Highs 30°F to 36°F. South winds 15 to 20 mph. Chance of snow 30 percent.
Wednesday Night...Breezy. Cloudy with a 50 percent chance of snow. Lows 16°F to 22°F.
Thursday...Cloudy with a 50 percent chance of snow. Highs 28°F to 34°F.
Thursday Night...Cloudy with a 50 percent chance of snow. Lows 10°F to 16°F.
Friday...Mostly cloudy with a 50 percent chance of snow. Highs 22°F to 28°F.
Friday Night...Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of snow. Lows 4°F to 10°F.
Saturday...Mostly cloudy with a 30 percent chance of snow. Highs 25°F to 31°F.
Saturday Night...Cloudy with a 50 percent chance of snow. Lows 9°F to 15°F.
Sunday...Cloudy with a 50 percent chance of snow. Highs 26°F to 32°F.
|* * * Snow Depth Totals as reported at SNOTELs * * *|
|Station||Depth (inches)||Station||Depth (inches)|
|Black Bear||114||Parker Peak||83|
|Blackwater||65||Snake River Station||-|
|Evening Star||80||Sylvan Road||49|
|Fisher Creek||97||Thumb Divide||58|
|Grassy Lake||97||Two Ocean Plateau||-|
|Lewis Lake Divide||89||West Yellowstone||47|
|Madison Plateau||76||Whiskey Creek||59|
from the Gallatin National Forest Avalanche Center - February 28, 2011 - this report is by Eric Knoff. This advisory does not apply to operating ski areas.
Over the past 24 hours 1 to 2 inches of new snow fell in most areas. Mountain temperatures are on the cool side ranging from the single digits to low teens Fahrenheit. Winds have started to pick up - blowing out of the West-Southwest at 15-30 mph with gusts in Hyalite and Big Sky reaching into the 40's mph. Winds will continue to increase throughout the day with gusts reaching upwards of 60 mph by this afternoon. Temperatures will climb into the 20's under mostly cloudy skies. A cold front will arrive this evening bringing with it cooler temps and light precipitation. 1 to 3 inches will accumulate in the mountains by tomorrow morning.
Snowpack and Avalanche Discussion:
The Bridger, Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
Hold on to your hats skier and riders, today could get a little wild. After a superb day yesterday, the weather is turning once again. Winds in the range of 50-60 mph are expected in the upper elevations today and light snow will likely be part of the equation. The good news is - the mild weather yesterday helped stabilize recently formed wind slabs and assisted in reducing snow available for transport. The bad news is - our snowpack could once again be heading down the slippery slope that new snow and strong winds can create.
Despite a brief setback from yesterdays calming effects, I don't expect this latest storm to cause any long term problems. The snowpack throughout our advisory area is relatively strong and is fortunate to have very little in the way of buried weak layers. Yesterday, Mark did a long tour in the northern Madison Range and did not observe any recent avalanche activity, nor did he experience any signs of instability such as cracking or collapsing. Mark did mention most slopes had been affected by the wind, but he felt comfortable skiing in steep terrain. One potential problem he did notice was a layer of facets forming on the surface of south aspects. This layer will only be a problem if it receives a heavy load.
Doug also found stable conditions in Cooke City. He did observe a few small slides - one likely triggered by a skier and the other by a cornice drop; but he felt these events were isolated and did not represent the overall snowpack. I was in Hyalite yesterday and also felt comfortable in steep terrain. I observed climbers on nearly all the major ice climbs and talked with a few skiers who ventured up high. One skier did mention he saw a small slab avalanche near Hyalite Peak, but that was the extent of natural activity.
Today, the primary avalanche concern will be wind loaded slopes - specifically near ridgelines or in steep, rocky terrain. If the winds crank like they are forecasted to, conditions may change rapidly. As always, pay attention to your surroundings and consistently ask yourself "Is the weather contributing to instability?" If conditions do start to change never be afraid to alter your plans.
For today, the Avalanche Danger is rated MODERATE on all wind loaded slopes and MODERATE on all slopes steeper than 35 degrees. On less steep slopes unaffected by the wind, the Avalanche Danger is rated LOW.
New Snowpits Page
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.
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.
Backcountry Skier Survey – Researchers at Alaska Pacific University are studying decision making in backcountry skiers and would like to get information from you. If interested in this 10-15 minute survey, go to this website: https://www.surveymonkey.com/s/SE_AK_Backcountry_Skiing_Research.
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.
The 30th Annual Pinhead Classic on is Saturday, March 5th. "Gangsters and Flappers" is this year's costume theme, so come dressed up to race, socialize and wind great prizes. Registration is $30 but get you all sorts of cool stuff. All proceeds benefit the Friends of the Avalanche Center. Check out the website http://pinheadclassic.com for details.
Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center
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