Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:03 a.m., Wednesday, February 7, 2007

Tuckerman Ravine has Considerable and Moderate avalanche danger. The Lip has Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Unstable slabs are probable in steeper terrain. Be increasingly cautious in steeper terrain. All other forecast areas in Tuckerman Ravine have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steep terrain. The Lower Snowfields and Little Headwall are not posted due to a lack of snow in these areas.

Huntington Ravine has Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

Today's stability issues are basically the same as yesterday's with the addition of upslope snow to keep an eye on. Cold temperatures are slowing down the sintering process keeping the elastic energy in recently deposited slabs. These slabs vary quite a bit in density depending on where you are. Expect some of them to be hard to kick a boot into while others in very sheltered areas will be softer. The relatively softer slabs will be more prone to human triggers than the ones that make you want your crampons on your feet. The Lip remains the area of most concern due to the amount of new slab that has been deposited there. The past two days have provided us with winds well over 100 mph (161 kph). These winds have scoured snow from some areas and deposited it in locations that you may not think to be looking for avalanche problems. These areas include the approaches to some climbs in Huntington Ravine. The recent persistent and strong winds have also exhausted the supply of transportable snow above treeline for the wind speeds we expect today. Today's summit winds are forecasted to be out of the WNW at 30 to 50 mph (48 to 80 kph) and increase to 50 to 70 mph (80 to 112 kph) with higher gusts this afternoon. While there may not be any older snow to move around at these speeds, new snow will have no trouble being blown into the ravines on these winds. This brings us to the second stability factor for today and the rest of the week. Snow showers are in the forecast today, tonight and tomorrow. There isn't a lot of moisture in the air, however, I am always on my toes anytime there is upslope snow in the forecast and the temperatures are particularly cold. This allows for lighter density snow and often higher accumulations than we would see otherwise. This type of snow is difficult to pin down and occasionally gives us unexpected accumulation. A couple of inches will change our stability situation given today's increasing winds. If you are in avalanche terrain today keep your eye on the changing surface conditions and new snow amounts.

THE LION HEAD WINTER ROUTE IS OPEN. This is a steep and challenging route. Crampons, an ice axe, and the ability to properly use this equipment are necessary for safe travel on this route.

Please Remember:
•   It is impossible to accurately predict natural events, such as avalanches, in every instance. This Advisory is one tool to help you make your own decisions in avalanche terrain. It should be used along with safe travel techniques, snow stability assessments, an understanding of weather's effect on the snowpack, and proficiency in avalanche rescue.
 
•   You should obtain the latest weather forecast before heading into the mountains. Anticipate a changing avalanche danger when actual weather differs from the National Weather Service forecast.
 
•   For more information, contact the U.S. Forest Service Snow Rangers, the HMC Caretaker at the Harvard Cabin, and the AMC at Pinkham Notch Visitor Center or Hermit Lake Shelters. This advisory will expire at midnight.

Brian Johnston, Snow Ranger
USDA Forest Service
White Mountain National Forest
(603) 466-2713 TTY (603) 466-2856
 
This is the Official Tuckerman Ravine website.  Occasionally the remoteness of Tuckerman Ravine, weather, or communication problems prevent the website from being updated immediately.  Check the date, and if it is not the most recent, you can also call the National Forest Service's 24 hour avalanche hotline at (603) 466-2713 (ext. 4)

Avalanche Advisory Archives.

United States Avalanche Danger Descriptions.

Échelle Canadienne de risque d’avalanche.

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