Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:14 a.m., Wednesday, February 6, 2008

Tuckerman Ravine will have HIGH, CONSIDERABLE AND LOW avalanche danger today. The Bowl, Lip and Headwall will have High avalanche danger. Natural and human triggered avalanches are likely. Travel in avalanche terrain is not recommended. Right Gully, Left Gully, Hillman's Highway and the Lower Snowfields have Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steep terrain. The Little Headwall has Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution in advised.

Huntington Ravine will have Considerable avalanche danger today. Natural avalanches are possible and human triggered are probable. Unstable slabs are probable in avalanche terrain. Be increasingly cautious in steep terrain.

This is shaping up to be a very interesting week ahead of us. A few low pressure systems will bring snow to the mountains with relatively light winds until the weekend. Before we talk about the future, let's look back to yesterday. We had an impressive temperature spike on the mountain that gave us some freezing rain and encapsulated a lot of the snow I was thinking would be transported. As a result the 80+ mph winds didn't find much to move around and now we have a .4" (1 cm) freezing rain crust at Hermit Lake. Now new snow if falling at a steady rate on top of this new crust and has added up to 3" (7.6 cm) at Hermit Lake. This system is forecasted to give us 3 to 5" (7.6 to 12.7 cm) of snow today but it looks like we may squeak out 6+" (15 cm) based on what has already fallen and the bands of heavy precipitation that are still to come. Winds are not going to be very impressive today with forecasted speeds of 25 to 40 mph (40 to 65 kph) out of the WSW on the Summit. This is going to keep wind loading to a minimum but I do expect light transporting to create soft slab conditions, particularly in the start zones. Given the rate of snowfall expected today and the potential for some light transporting of the new snow, natural avalanches are a possibility in most locations. In addition to soft slab avalanches, loose snow avalanches (point release) are a potential issue today. As this system winds down, another one will replace it causing the winds to wrap all the way around the compass rose over the next 24 hours. This storms arrival will keep the pressure gradient down resulting in low wind speeds through Friday. This second system is forecasted to give us another 3 to 5" (7.6 to 12.7 cm) of new snow beginning around 1 am tomorrow morning. Yet another storm is brewing for Saturday with strong winds expected as it exits the region. A lot can happen between now and then but it seems as though we could be in for another impressive avalanche cycle this weekend. Stay tuned and enjoy the new snow.

Crampons, an ice axe and solid self arrest skills are recommended for travel in steep terrain. This includes the Lion Head Winter Route. The Sherburne Ski Trail is open with new snow and full coverage.

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 AMC at Pinkham Notch Visitor Center or Hermit Lake Shelters, or the HMC caretaker at the Harvard Cabin. This advisory will expire 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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