Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:12 a.m., Monday, December 24, 2007

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.

'Twas the day before Christmas when all through the Ravines not a slab was stirring, not even a pocket.

We have endured the first winter rain on our snowpack and I must say that I am quite pleased. Over the past 24 hours, the Summit recorded .69" (1.7 cm) of rain and Hermit Lake picked up 1.3" (3.5 cm) of rain. Most of the drainages opened up below the Ravines, but generally the Ravines themselves look no worse for the ware. The rain did trigger some relatively small slab avalanches in both Tuckerman and Huntington but there were no impressive slides to report. I observed new activity in South, Pinnacle, the Fan and Damnation in Huntington and, so far, only in Dead End Gully (AKA Empress), Gully #3 and the Sluice in Tuckerman. Overnight the temperatures dove from above freezing to the single digits F. As a result, the snowpack is in the process of setting up into a concrete like mass as all of the free water in the snow freezes solid. Until it fully sets up, expect horrendous travel conditions around the mountain, particularly if you go off the beaten path. Conditions are ideal for post-holing, especially on the lower part of the mountain. If you plan on climbing ice in Huntington be aware of the potential for ice dams. With lots of free water running yesterday followed by a rapid freeze I would expect to find ice dams in most gullies.

As far as stability issues go today, there isn't much to talk about. After temperatures fell below freezing, the precipitation changed to snow and the Summit recorded .5" (1.3 cm) of new snow. High winds have blown this snow into the Ravines and the Lip currently has a thin veneer of new snow in it that may harbor an isolated pocket to be wary of. The one thing that stands out to me that warrants watching is the potential for upslope snow today. Moisture seems limited so I am not expecting much but if you notice it is snowing and accumulating, heads up! Strong W and WNW winds will be ideal for loading any new snow into the Ravines and just a couple of inches of new snow can be enough to create unstable slabs.

The John Sherburne Ski Trail is open with continuous snow from top to bottom. You may need to visit your dentist after skiing or riding it due to the freeze up. THE LION HEAD WINTER ROUTE IS NOW 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.

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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