Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 7:36 a.m., Saturday, November 17, 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.

Winter has come to town and it wants to shake your hand and kiss your baby! Not wanting to be outdone by the slew of other celebs visiting the Granite State it decided to make a pretty showy entrance. Thursday provided the Summit with just under 2"(5cm) of rain, which was more than enough to hit the reset button. Snow accumulation to that point had been pretty meager and few snowfields of any size were able to hang on through the deluge. As the rain moved out of the area temps began their downward slide and after a four hour break the snowflakes began. The Summit picked up a total of 9.4"(24cm) with very strong winds out of the W and NW. The peak gust was out of the NW at 110mph(176kph) and the average wind speed on Friday was 64.7mph(104kph). This combination of hefty winds and sizeable snowfall should be waving big red flags in your early season brain. Were we in the middle of the season these conditions would likely be pushing ratings into the upper part of the 5 scale system. The reason we're not there now relates to the state of the ravines prior to the arrival of our white friend. With no good bed surfaces on which to lie the snow has resigned itself to falling largely on vegetation and rock. The associated surface roughness will help lend a hand with stability at the interface. Avalanche activity is still possible but it would be most likely to occur within the new snow where there are slight changes in density. That being said, we have now set the stage for upcoming snow events to create a bigger stir in the mountains. Keep a close eye on the weather as the next few days look to be pretty dry but we all know how quickly things can change!

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 a climber picks 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.

Be aware of falling ice if we get into thaw periods before the real deep winter freeze. Many folks have been injured and killed by falling ice so pay attention to where you are, and don't linger when under ice. Have a plan in mind about what you will do and where you will go if ice comes down. Station yourself near a large rock to duck behind in the event of ice fall.

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. 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. A new General Advisory will be issued when conditions warrant.

Justin Preisendorfer
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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