Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:00 a.m., Saturday, January 12, 2008

All forecast areas of Tuckerman and Huntington Ravine have Low avalanche danger today. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

The mountain picked up just a bit of what I would call snow yesterday morning which was mixed with ice pellets and some freezing rain. This wintry mix rapidly diminished in complexity turning into a light freezing rain for the day incasing the landscape in a thin veneer of ice. Generally speaking we have a stable snowpack across all elevations due to the lock up of saturated crystals from this week's rain and high temperatures. Of the hazards we typically discuss avalanches are taking a back seat to sliding falls, breakable crusts, and ice dams.

Surface conditions are slick and icy which make crampons, an ice axe, and the skill to use them effectively worth their weight in gold....actually make that diamonds. Although these items are a standard you should always have with you the current conditions make them imperative for survival in case of a fall on steep terrain. Immediate self arrest before any speed build up will be critical as the low friction coefficient between ice and Gore-Tex will put you at Mach 1 in seconds. Another topic worth noting is the temperature gradients causing faceting which in turn is weakening the ability for the surface crusts to hold your body weight in some locations. For the most part we have hard, strong, resilient surface conditions that can hold your body weight particularly in angled terrain. But in some locations especially with rocks, cliffs and trees above and below the surface you will find a weakening bridge of surface snow. This can cause a random surprise postholing to your thigh when you least expect it. If this occurs while you're descending a gully rapidly this could send you - - - over tea kettle pretty quickly down the slope. Expect this in thin treed gullies like the Escape Hatch.

The valley ice climbing conditions took a punishing this week which puts most ice opportunities up high so we are expecting some good traffic in the Ravines over the weekend. Think about all the other visitors around you. Watch out for climbers sending ice down the slope and conversely don’t send ice down on climbers below. Ice dams and their hydraulic force should weigh heavy on the mind with all the running water under snow and ice in the gullies. Protect ice sections well and bring rock gear that can deal with some verglass conditions in addition to ice screws.

Skiing and riding anywhere on the mountain would be extremely challenging and even the Sherburne ski trail will be survival skiing. I would be very surprised if anyone on boards will be smiling at any point during there visit except the uphill slog. If you do decide to give the ski trail a look hockey pads would be helpful as a fall on the Sherburne will make an ice rink feel tame.

THE LION HEAD WINTER ROUTE IS OPEN. This is a steep and challenging route for mountaineers. Crampons, an ice axe and the ability to properly use this equipment are recommended 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 or the AMC at Pinkham Notch Visitor Center or Hermit Lake Shelters or the HMC caretaker at the Harvard Cabin. This advisory will expire at midnight.

Christopher Joosen, 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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