Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:51 a.m., Sunday, January 22, 2006

Tuckerman Ravine has both MODERATE and LOW avalanche danger. The Bowl, Headwall, Lip and over to the Sluice have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain. All other forecast areas in Tuckerman have Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely EXCEPT IN ISOLATED POCKETS. Normal caution is advised. We have temporarily stopped forecasting for the Little Headwall due to a lack of snow in that area.

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.

For the third time in the past week we have gone from above freezing with at least some rain to arctic conditions overnight. The temperature dropped almost 40 degrees F since yesterday afternoon due to the steamroller of cold air off of the Canadian plains. As the front slammed the mountain yesterday winds picked up very quickly giving us a maximum overnight of 119mph (193kph). Snow began with the arriving front giving us 2.4" (6cm) on the summit as of 6am this morning. It's not much I know, but once again intense wind velocities have transported enough snow to give us slabs of varying depth around the eastern side of the mountain. This is mostly in the form of isolated pockets falling under the "Low" rating. Some examples of this exist in the upper north (right) fork of Hillman's, in Left gully, and in the Chute. Of the two Ravines the E and SE aspects of the Lip and the areas stretching out 300-450ft (100-150m) in all directions from this location have picked up the most snow. Therefore I would consider the "greater Lip area" from the center of the Bowl over to the Sluice to have Moderate avalanche danger. Another major hazard to be conscience of is the extraordinarily hard old surface conditions. To call it bullet proof is truly an understatement. "Cruise missile proof" or "Howitzer proof" would be better for many locations. Crampons, an ice axe and solid technique are a must in most areas on the upper part of the mountain today. Our snowpack is better described as an "icepack" and self-arrest would be very difficult to execute successfully. Use caution and be honest about you skills and mountaineering experience. The freeze up has once again caused concern about "ice dams" that ice climbers may face in either Ravine. Be aware of hydraulic pressure behind the ice waiting to be released by a tool placement or crampon kick. Although ice dams can occur in numerous locations, the top of ice bulges have historically proven themselves to be the most frequent places for blowouts to occur.

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 very thin cover and varying conditions. Expect bare ground, long sections of water ice, deep waterbars and water channels that can grab a ski tip very quickly. If you consider survival skiing fun you might smile, but I doubt it. To survive the trip be sure you've got razor edges and a sharpening tool to rework them a few times on the way down.

Please Remember:
•   • 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. Anticipate changing avalanche danger when actual weather for the day differs from the NWS forecast.
 
•   • You should obtain the latest weather forecast and review archived avalanche advisories at www.tuckerman.org for snowpack history before heading into the mountains.
 
•   • It is impossible to accurately predict natural events, such as avalanches, in every instance.
 
•   • 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.

Christopher Joosen, 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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