Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:59 a.m., Tuesday, February 22, 2005

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 which has Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

Huntington Ravine has MODERATE avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain.

This morning we're lucky enough to find a fresh blanket of 4-5% snow around the mountain. Both Hermit Lake and Harvard Cabin picked up about 20cm(8in) of fluff while the summit got about half of that. The wind has died down from yesterday's 75kph(47mph) peak gust out of the SE. Currently the summit windspeed is 23kph(14mph) out of the W and the forecast is for W winds about the same speed until a slight increase occurs this afternoon. These winds have had little trouble transporting the new snow and we expect windslab near the Ravine rims on slopes with N through E aspects. The slabs created in these areas are likely to be very soft and easily overlooked if you're not keeping your avalanche eyes open. Soft slabs are generally easier to trigger than hard slabs due to their decreased ability to spread out the stress. They also tend not to propogate as far as a stiff slab though their mass and generated momentum may surely be enough to send you on a ride for which you never wanted a ticket. Besides the snow underfoot pay close attention to what's going on in the sky and especially at the tops of any avalanche slope. Can you see snow blowing around? In what direction? Do the winds look to be increasing? Use all your avalanche skills today and you may be rewarded with some spectacular skiing or riding. Let your guard down and it may be the worst day of your backcountry career. We are currently at Moderate in all areas but will be pushing towards Considerable on slopes in the lee of W winds by late in the day, especially if the winds pick up in speed before noon. Have fun but pay close attention to the weather. There's pleanty of terrain to enjoy without going into the most suspicious areas! Light snow is expected off and on today with more coming in tonight. Keep doing your snow dance before bed everyone!

THE LION HEAD WINTER ROUTE IS OPEN. Mountaineering skills and equipment are required on this route. Crampons and an ice axe are a must for safe travel on Mount Washington. With this past week's snow and more coming snowshoes are recommended for all areas except trails known to be packed. The John Sherburne Ski Trail has good coverage.

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.

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 the Pinkham Notch Visitor Center or Hermit Lake Shelters or the HMC Caretaker at Harvard Cabin.
 
•   This advisory will expire 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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