Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 6:50 a.m., Friday, November 23, 2007

The Summit climbed above freezing on Wednesday afternoon, peaked with a high of 42F(5.5C) 24 hours later and has dropped to 0F(-18C) in the last 12 hours. Plummeting temperatures will lock together wet snow that survived the .8in (2cm) of rain from Wednesday and Thursday. Ice should build rapidly with lots of water on the move behind and on top of any newly formed ice. Keep this in your brain as snow showers combine with NW and W winds to transport snow onto slick surfaces with poor bonding ability. These small pockets that can serve as a means to link early season ice features may ruin your day if they decide to flush at the wrong time.

After today's snow showers and negative temperatures the Summit should start to rewarm like tasty Thanksgiving leftovers. The beginning of the weekend looks to provide some nice clear weather to work off the lingering turkey coma. Temperatures will rise going into the start of the week and some wet weather may provide an light hosing. We'll keep our fingers crossed. Keep an eye on the weather as things may, and usually do, change on a frequent basis! A change to a snow event could create new avalanche potential in the mountains. Watch the precipitation pattern closely over the next week.

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.

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.

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, 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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