Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:34 a.m., Tuesday, January 10, 2006

Tuckerman and Huntington Ravines have MODERATE avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain. The only exception to this is the Little Headwall and the Lower Snowfields in Tuckerman which have Low avalanche danger. In these areas natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

The Summit picked up 3"(7.6cm) of new snow from this last quick moving storm with the period of highest intensity occurring yesterday midmorning. As winds were making their shift from S to W during the same period I observed a wild variety of crystal types including some heavily rimed needles. This type of crystal is able to pack very tightly and create a stiffer slab than you might see from spatial dendrites or stellars falling under similar conditions. By noon yesterday winds had made their shift to the W and began the ramp up to the higher speeds that they have maintained through this morning. Most of the Summit observations have been between 60-80mph(97-129kph) with higher gusts common. Blowing snow has been included in all of the last 24 hourly observations but we expect transport to fizzle out as winds die down a bit later today. Because of this, the potential for natural avalanche activity has been declining and is now unlikely in all forecasted areas. Human triggered avalanches are a different story however. It is possible that a climber or skier will trigger a slide today in either Ravine. If you're recreating on NE, E or SE aspects you will also increase the probability of doing so. Winds loaded these aspects most heavily and new windslab now overlies the layer that proved to be very energetic over the weekend. Any avalanches that do occur may generate enough force to step down to this lower level and create more dramatic results.

The next week of weather has the potential to be our friend though it currently looks more like an enemy. Starting tomorrow we may see a couple of systems move through that start as liquid before moving over to snow. At least its not the other way around but stay tuned in for how this will effect our snow stability.

THE LION HEAD WINTER ROUTE IS OPEN. Mountaineering skills and equipment are required for safe travel on this route.

The Sherburne Ski Trail is open with varying conditions. Expect new snow, old crust, deep waterbars and typical New England goodness.

As always, this advisory is one more tool to help you make your own decisions in avalanche terrain. It should be used along with your own snow stability assessments, knowledge of safe travel techniques, skill in reading mountain weather's effect on the snowpack, and avalanche rescue. To improve these skills take an avalanche course. We have all the avalanche courses offered in and around the Mt. Washington Valley this winter on our website, tuckerman.org.

Please Remember:
•   • Any new precipitation may increase the avalanche danger, this includes wind transported snow.
 
•   • Obtain the latest weather forecast and review archived avalanche advisories at www.tuckerman.org for snowpack history before heading into the mountains.
 
•   • 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.

Back to the Tuckerman Ravine Home Page