Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:16 a.m., Wednesday, January 11, 2006

Tuckerman Ravine has 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.

Huntington Ravine has MODERATE and LOW avalanche danger. Central Gully has Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain. All other forecast areas in Huntington Ravine have Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

Unseasonably warm temperatures are invading Mt. Washington. It is currently 39 F (4C) at Hermit Lake and raining lightly. A dynamic weather pattern will dominate the weather today which has us focused on minute details. Here is the data we are going on for today. Light rain this morning will add between .01 and .1" of liquid into our snowpack. A drier slot of air will keep shower activity light for most of the day and then rain will pick up a bit more between 7 pm and 12 am. This shot of moisture is expected to add up to .1" more of liquid to the snowpack. The heaviest precipitation is expected to fall between 1 am and 7 am tomorrow morning and the GFS model is suggestion .25" to .5" of liquid falling in the form of snow. Our focus today is on the rain amounts and intensities. The rain paired with warm weather causing snow melt has us concerned about slab strength deteriorating while they are sitting over loose unconsolidated snow below. With the current forecast, expect slabs to be approaching the Considerable rating late in the day. If liquid equivalents or intensities exceed the forecasted ratings, expect many areas to enter the Considerable rating with natural avalanches being possible. Many areas posted at Low in Huntington were scoured by high winds yesterday. Be weary of isolated pockets of instability in all areas posted at Low. Check tomorrow's advisory before heading out. We could be dealing with new snow and wind loading. Nary a dull moment up here.

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.

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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