Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:13 a.m., Sunday, March 4, 2007

Tuckerman Ravine has MODERATE and HIGH avalanche danger today. The Little Headwall 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 High avalanche danger. Natural and human triggered avalanches are likely on a variety of slope angles and aspects. Travel in avalanche terrain is not recommended.

Huntington Ravine has CONSIDERABLE and HIGH avalanche danger today. The Escape Hatch has Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain. All other forecast areas of Huntington Ravine have High avalanche danger. Natural and human triggered avalanches are likely on a variety of slope angles and aspects. Travel in avalanche terrain is not recommended.

The mountain did well with 2.4"(6.1cm) of new snow at the Summit over the past 24 hours and about twice as much near the base of both Ravines. Some areas got substantially more and we measured 9.4"(24cm) of new snow at the entrance to Huntington this morning. Snow showers will continue through the next 36 hours and we will likely see another 2-3"(5-7.5cm) of snow today. Winds will blow out of the NW with moderate speeds that are ideal for both wind transport and whiteout conditions. The wind is currently out of the W at 55mph(89kph). New snow will continue to be light and fluffy with current densities around 5-6%. The combination of these conditions will create soft windslab in the start zones that will react enthusiastically to human triggers. An added concern is the presence of a light to medium density underlying slab that was created on Friday and capped by a thin breakable raincrust. This crust may act as a bed surface for today's avalanche activity with loose unconsolidated snow and new windslab completing the layers above. There is also the potential for today's slides to step down below the crust and pull out the deeper slab. We found evidence of avalanche activity in this layer yesterday morning including a potentially human triggered slide in the Lip. Though we don't know too much about the circumstances it appears it was triggered by snowshoers descending the Lip under the cover of darkness. A self rescue likely ensued as evidenced by an excavation hole and it appears that no one suffered any substantial injuries.

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 John Sherburne Ski Trail is open and has generally good coverage with new snow covering most of the trail.

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.

Back to the Tuckerman Ravine Home Page

!Éit !Ê