Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:54 a.m., Saturday, December 10, 2005

Tuckerman and Huntington Ravines have Considerable avalanche danger today. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain. Many of the forecast areas are pushing toward the High rating this morning. As the winds slow down and transport is curbed we will see things move toward a traditional Considerable rating. We are currently not forecasting for The Lower Snowfields, the Little Headwall, and Right Gully in Tuckerman and the Escape Hatch in Huntington Ravine due to lack of snow.

Although the southern and coastal parts of the state got considerably more snowfall than the mountains we're not going to complain. The Summit recorded more than 6"(16cm) by this morning and we may see light snow showers for a few more hours. So far what we've been getting is in the 10-11% density range and is collecting in some impressive drifts. They're calling for a little bit of clearing later in the day and we're hoping we can get a look at the Ravines. Winds are expected to soften to 40-60mph(65-97kph) later today as they shift back to the SW. This wind shift will likely be putting the icing on the cake in terms of windloading. When snow first began yesterday morning the winds were out of the SSW but they soon made a steady wrap through the W and NW. This allowed all areas in the Ravines to be loaded and crossloaded from a variety of angles. Today's shifting winds and seemingly minor snow showers may be just the thing to tip the balance of stress and strength. New windslab currently overlies a bulletproof layer of rainhardened snow that refroze with a high liquid content approximately two weeks ago. The interface between this slick layer and the new windslab may also be compromised by a thin layer of unconsolidated snow that fell before winds picked up yesterday morning. This stratification has the potential to be very touchy and could use a little time to adjust to the new setting. As the clouds lift this morning try not to get too excited about the mountain's new coat. Human triggered avalanches are probable today regardless of the weather!

In some areas the wind may have scoured the snow down to the hard old surface. It may be more stable than the fresh new snow but it should also be recognized as a potential hazard for travelers on the mountain. Most slopes are very icy so as always crampons and an ice axe are essential for travel on open terrain of any steepness. Self arrest will only be effective if executed immediately after a slip otherwise speed and the snow density may make attempts futile. Also remember that many summer trails go through avalanche terrain. Summer trails are for summer! Use safe travel practices.

Don't wait any longer to refresh your avalanche skills. Pull out your beacon, practice, and spend a couple bucks on a fresh set of high quality batteries. Review your safe travel rules, techniques for assessing snow stability, and sign up for an avalanche course. We have all the avalanche courses offered in the Valley this winter on our website, tuckerman.org. Christmas is coming soon so sign yourself or a loved one up now!

Please Remember:
•   • Any new precipitation may increase the avalanche danger, this includes wind transported snow.
 
•   • Obtain the latest weather forecast before starting out.
 
•   • For more information, contact the U.S. Forest Service Snow Rangers, the AMC at Pinkham Notch Visitor Center or Hermit Lake Shelters or the HMC caretaker at the Harvard Cabin.
 
•   • This avalanche advisory expires at midnight.

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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