Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:24 a.m., Saturday, January 27, 2007

Tuckerman Ravine has Moderate and Low avalanche danger today. The Headwall, Bowl, Lip, and Right Gully have Moderate danger. Natural avalanches are unlikely and human triggered avalanches are possible. Unstable slabs are possible in steep terrain. Use cautioun in steeper terrain. Left Gully and Hillman's Highways have Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised. The Lower Snowfields and Little Headwall are not posted due to a lack of snow in these areas.

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

Compared to earlier this week, today should be a pretty nice day to be out on the mountain. However, very cold temperatures, light snowfall, and continued loading that have taken place throughout the week have kept stabilization to a minimum. In Tuckerman Ravine, areas at Moderate are at the upper end of the definition, particularly near the Lip. Realize that just yesterday they were posted Considerable due to the probability of human triggered avalanche activity. On Thursday we saw the remains of avalanche activity in several areas of the ravine. Many of these fracture lines and start zones have been reloaded with new snow since then. These slabs will have a lot of snap (a.k.a. elastic energy) to them, which is what allows fractures to propagate. Cold slabs tend to hold on to this energy longer, so if you've been paying attention to the weather here you understand why stabilization has been kept to a minimum. As far as traveling through Tuckerman, areas around the Lip are our greatest concern, while areas with similar aspects such as the Sluice and the right side of the Headwall and the Chute could also be touchy. These areas not only have the greatest potential for avalanche activity, but they also tend to see the most human traffic. On busy days on the mountain, there is an increased chance that someone else might trigger something from up above you. Using safe travel techniques and avoiding spending time in runout zones will help mitigate this risk. On the other side of the coin, using your own skills to determine the stability of the snow you're looking at traveling through is just as important. If you have the opportunity, stay on the hard old surface.

Huntington Ravine has little snow to speak of. Most of the gullies have been scoured down by the winds, bringing a lot of the snow down low into the trees and into the approaches. You may see snow acting as slabs as you climb up to your route. As you climb you'll find old surface and possibly some isolated pockets to watch out for.

The Lion Head Summer Trail is still open. The Summer Trail crosses an avalanche prone slope that is still developing. We are keeping a close eye on this slope, but as always, safe travel techniques dictate traveling across this and other such slopes one at a time.

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.

Jeff Lane, 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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