Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:12 a.m., Thursday, March 1, 2007

Tuckerman Ravine has MODERATE and LOW avalanche danger today. The Lip has Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain. All other forecast areas of Tuckerman Ravine have 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 LOW avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

Feast or famine strikes once again. We certainly have seen a number of interesting trends over the last few months. December and January were the upslope months with a little bit of snow just about every day. February followed with extended periods of drought punctuated with a few punches of precipitation including the Valentine's Day storm which mountain goers embraced like a long lost lover. After a beautiful week of enjoyable spring weather we are about to completely shift gears. Beginning tonight we will welcome a major storm as March comes in like a lion. The NWS has issued a WINTER STORM WARNING FOR THE ENTIRE FORECAST AREA FROM TONIGHT THROUGH FRIDAY. QPF water totals are ranging from 1.2 to 1.8" (3-4.5cm) which could deliver upwards of 24" (60cm) of low density snow. The main difference from Cupid's storm on Feb 14th is less expected wind and lower densities. However, we don't need to approach the sustained 100+ mph winds of the last major event to see the dramatic effects of windloading. SE winds will bring initial snow in on low velocities from 15 to 30mph (24-48kph) which should act nicely as the unconsolidated snow/soft slab weak layer for denser slab development on Friday. Winds are currently expected to remain out of the SE and increase towards 70mph (115kph) tomorrow which will load northerly aspects more than our typical snow events. With that said 1 to 2 feet of snow will generate natural avalanche activity on all aspects. At this point I would anticipate at least a "High" avalanche danger rating posted for tomorrow. Winds will eventually wrap and continue loading into the weekend. Expect numerous instability problems on Saturday and Sunday. Be sure to read the avalanche advisory Friday morning to get the latest info about the impending storm. Focusing on today for just a moment, most areas continued to benefit from solar gain over the past several days and slabs pose little threat of propagation. The only major concern is if the thicker and colder slabs under the solar affected surface slabs were to be disturbed enough to collapse the weak facet layers underneath. Although the Lip catches our attention due to the consistency of its slab layers and its terrain factors such as pitch and shape of the start zone, you could find facet layers in other locations such as the Headwall area.

The Lion Head Winter Route is open. This is a steep and challenging route. Crampons, an ice axe, and the ability to properly use this equipment are necessary for safe travel on this route. The Little Headwall has filled in with snow; however, it is quite a thrash to get into and out of the skiable terrain. The John Sherburne Ski Trail is open and has generally good coverage with some scoured sections.

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, the HMC Caretaker at the Harvard Cabin, and the AMC at Pinkham Notch Visitor Center or Hermit Lake Shelters. 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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