Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:23 a.m., Thursday, January 26, 2006

Tuckerman Ravine has HIGH and CONSIDERABLE avalanche danger. The Lip has High avalanche danger. Natural and human triggered avalanches are likely. Unstable slabs are likely and travel in this area is not recommended. All other forecast areas in Tuckerman Ravine have Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steep terrain. We have temporarily stopped forecasting for the Little Headwall due to a lack of snow.

Huntington Ravine has CONSIDERABLE avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Unstable slabs are probable in steep terrain. Be increasingly cautious in steeper terrain.

Finally we have some snow to get excited about! Snow began falling on the Summit yesterday around 4 pm and is now starting to wind down. As of 7 am the Summit recorded 9" (23 cm) of new snow with a density of 7%. Hermit Lake received 5.5" (14 cm) of snow with a density of 5%. We expect a bit more snow this morning and then drier air this afternoon. What has our attention today is a good amount of light density snow sitting above treeling paired with a forecast for increasing winds through the day. Summits are forecasting N/NW winds 45 to 60 mph (72 to 96 kph) today and the winds are expected to increase more tonight and tomorrow. These will be the strongest winds that we have seen in a couple of days which means there is more snow available for transport than the snow we have received in the past 24 hours. Since Tuesday, the Summit recorded 2.6 " (6.5 cm) of snow and Hermit Lake recorded 3.4" (8.6 cm), all of which had densities lower than 10%. The bottom line is that winds have been and will continue to load the Ravines with snow creating wind slabs. There is a good chance that these slabs will be quite soft in the beginning, but touchy nonetheless. As the day progresses and winds continue to increase we expect many areas to be at the upper end of the Considerable rating and moving into the High rating late in the day and overnight tonight. The Lip is forecasted at High today due to it's ideal aspect and history of running frequently under these conditions. While we expect the Lip to reach High before other areas, I don't expect its neighbors to be far behind. It is worth noting that if we get natural avalanche activity, we could see these avalanches rip out older slabs that are sitting on our unforgiving ice pack underneath. This is a scenario we could see in a number of areas, but especially in the Lip, Bowl and Sluice. The Lower Snowfields have a Considerable rating due to the potential for the Duchess, which runs into the Lower Snowfields, to avalanche.

Due to the very light snow densities, I would bet you are going to encounter icy conditions in areas that aren't being loaded with new snow. Crampons, an ice axe and solid technique are a must in most areas. The older snow is more like alpine ice and self-arrest is very difficult to execute successfully. Use caution and be honest about your skills and mountaineering experience.

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 thin cover and varying conditions. New snow is covering long sections of water ice, deep waterbars and water channels that can grab a ski tip very quickly.

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 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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