Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 7:46 a.m., Friday, November 30, 2007

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 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 onto any open slopes. Realize that snowfields may be developing on existing summer trails. Check tuckerman.org frequently as we move through the end of the month and into December. Always check the latest avalanche advisory before heading into avalanche terrain.

It looks like this weekend's weather is going to help break all of us in for winter. Falling temperatures will result in the Summit staying below 0 F for the day on Saturday and steady westerly winds will accompany the cold temperatures which will make us all snuggle into our parkas and embrace the season. This past week brought scattered snow showers to the mountains with limited accumulation. Winds have been able to blow what snow there is into the Ravines but bed surfaces are still very limited. In Huntington some small thin ribbons exist primarily in O'Dells and Central which will offer a bed surface for new loading, but will be quite isolated in nature. Tuckerman also has limited snowfields. As is the usual early season scenario, Left Gully contains the largest bed surfaces and is the most likely candidate for avalanche activity. The Chute is a slight runner up and is worthy of watching as well. Other isolated small pockets currently exist in both Ravines. In addition to the issues already discussed, another factor to watch is snow being deposited on developing water ice. This is a normal early season concern. Ice is forming rapidly and provides an ideal bed surface for future avalanches. Keep reading for more information and don't let small pockets of snow lull you into complacency. The next sizeable snow event appears to be Sunday night into Monday. We'll keep an eye on it and let you know how it develops.

GENERAL EARLY SEASON CONCERNS- We are in early winter in the high mountains so don't plan on being able to follow summer trails safely. Trails going through ravines and gulfs require winter gear and equipment. Be aware that a small slab or sluff can be dangerous. This is particularly true in the steep gullies and slopes of Tuckerman and Huntington Ravines for early season ice climbers. As climbers pick their way through a route they will usually cross small pockets of snow. Often this snow has been deposited over blue ice, making for a poor bond at the interface. Consider this ahead of time and place protection before crossing suspect slopes. It doesn't take much snow to knock you off your feet and depending how high you are this could be a significant problem. Remember if a snowfield is big enough to recreate on, it's big enough to avalanche.

It is time 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. We now have all the avalanche courses offered in the valley this winter 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 or the AMC at Pinkham Notch Visitor Center or Hermit Lake Shelters or the HMC caretaker at the Harvard Cabin. A new General Advisory will be issued when conditions warrant.

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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