Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 7:07 a.m., Tuesday, December 19, 2006

This is an early season GENERAL AVALANCHE ADVISORY. Use of the 5-scale danger rating system will begin when conditions warrant. Until then new advisories will be issued as needed. A General Advisory is issued when instabilities are isolated within the entire forecast area. However it's important to realize that avalanche activity may occur within these locations before the issuance of a 5-scale forecast. This is a critical fact to remember. Under a General Advisory you need to make your own avalanche stability assessments before venturing into any open slopes. Realize that snowfields may be developing on existing summer trails. Always check the latest avalanche advisory before heading into avalanche terrain.

Some favorable upslope energy has developed and will bring snow to higher terrain on Tuesday and into Tuesday night. The higher summits forecast indicates that a few inches are possible. Winds will be out of the NW between 40 and 60 mph (64 to 96 kph) with higher gusts. While this isn't a major winter storm, the details have my attention focused on the potential for unstable snow in the Ravines. The wind speeds and direction are ideal for blowing any new snow into the Ravines and the amount of new snow forecasted is enough to cause stability issues. Expect the period of highest instability to be during the day Tuesday and into Wednesday morning provided the weather forecast doesn't change over the next couple of days. The largest snowfields that currently exist are in Left Gully and above the southern part of the Headwall. These are the areas that offer the largest bed surfaces for slabs to develop on. Smaller pockets are scattered around other parts of Tuckerman as well including in the Lip. While Huntington has less snow than Tuckerman, stability issues could arise as new pockets form on top of ice in the gullies. It only takes a small area underfoot to give way to cause some dire results. Don't focus all your attention on the size of an avalanche, but on the consequences of what will happen to you. If you plan on doing some ice climbing realize ice is still thin in many areas. If you do intend to climb leave the pickets at home and bring rock gear with a focus on small protection.

Don't plan on being able to follow summer trails safely without the right equipment. Be ready for the conditions you'll face with appropriate winter gear including winter clothes, ice axe, crampons, avalanche beacons, shovels, and probes. Don't wait any longer to refresh your avalanche skills. Pull out your beacon, install some fresh high quality alkaline batteries, and practice. Review your safe travel rules, techniques for assessing snow stability, and sign up for an avalanche course.

Avalanche courses offered in the valley this winter are now on our website, tuckerman.org.

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.

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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