Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 7:58 a.m., Sunday, February 11, 2007

Tuckerman Ravine has Low and Moderate avalanche danger. Hillman's Highway and Left Gully have Low danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. All other forecasted areas of Tuckerman have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Unstable slabs are possible in steep terrain. Use caution in steeper 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.

Field observations allowed us to verify yesterday's advisory and provide more detailed information today. A variety of slab hardnesses were detected in Tuckerman as you move from slope to slope. Some areas such as the center of the Bowl are dominated by dense windpacked snow that provides shallow boot penetration. Other areas in the mid to upper transition of Tucks have benefited greatly from the combination of W & WNW winds and small but consistent amounts of new snow. The narrows of the Chute have developed a softer slab that allows boot penetration up to knee deep. The same is likely to be the case in the Lip which continues to slowly build in size with small amounts of cross and direct loading. These conditions create the most concern for mountain-goers today and provide examples of the upper range of the Moderate avalanche danger rating where human triggered avalanches are the dominant concern. A number of areas are rated at Moderate today but as is often the case, the nature of the hazards varies from area to area. The harder slabs found in many spots are more difficult to trigger than the soft ones I described earlier but if they do fracture and fail we expect the results to be pretty impressive. The areas posted at Low today are dominated by scoured old surface or wind-hammered snow. With that said, some of these areas do have isolated pockets that demand your respect. Examples of these pockets can be found in the strong lee SE aspects of Left Gully and Hillman's Highway. Good routefinding skills will help you navigate through these areas and provide the best options for an ascent through Tucks.

Clouds are expected to develop as the day progresses and conditions should be similar to yesterday. Summit winds may be slightly lighter with sustained speeds up to 50mph(81kph) and we'll give another shot at having the temps finally climb above 0F(-18C) for the first time in more than a week. Keep your fingers crossed!

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.

Justin Preisendorfer, 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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