Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:41 a.m., Saturday, February 10, 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. Unstable slabs are possible in steep terrain. Natural avalanches are unlikely and human triggered avalanches are possible. 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.

The ravines are out of the clouds for the first time in several days this morning. Over in Huntington we saw the scouring effect that the wind had on the gullies there. All areas are at Low based on the wind cleaning the snow out of the gullies and bringing it down into the trees lower on the mountain. There may be isolated pockets in strong lee areas, and though finding them may be difficult, you should always keep aware for changing snow conditions underfoot.

In Tuckerman, the winds do less to scour out the snow and more to load it into new, cold slabs. The areas of greatest concern are those on the northern side of the ravine, particularly the Lip and Sluice. These leeward slopes tend to pick up more snow loading when winds come from the NW, and this certainly was the case with the past couple days of weather. The Lip and the Sluice are at the upper end of their forecast definition. While we are not very concerned about natural activity today, the possibility for a human to trigger an avalanche in these areas does exist. As you move away from the strong lee areas, into the Headwall and Right Gully, you'll find more wind effect on the snow and slightly less sensitive slab. However realize these locations are also posted at Moderate. Over in Left Gully and Hillman's, you may find isolated pockets in the strong lee SE aspects. In both these gullies, they are mostly found up high on the climber's right side, but are not exclusive to these locales. On the whole, when you can stay on scoured old surface you'll be better off than if you find yourself in softer slabs.

Some afternoon snow showers are forecasted for later today. They are not anticipated to bring much in the way of accumulation, but keep an eye on amounts as the day progresses. With moderate wind velocities today you should watch the potential of new loading later today.

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.

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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