Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:18 a.m., Monday, February 26, 2007

Tuckerman Ravine has MODERATE and LOW avalanche danger today. The Lip and Bowl have 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.

In Tuckerman Ravine, the Lip is the area that has us most concerned about human triggered avalanche potential. Our observations from the field on Saturday showed there were slabs of varying hardness and thickness with enough energy to be of concern. This was followed by a gorgeous day on the mountain yesterday. The Ravine received generous sunlight and warmth throughout the day. This wasn't enough to create a melt-freeze cycle as we might see in the spring when the temps are even warmer and the sun higher in the sky, but it definitely helped the snowpack settle down a bit. This settlement is very noticeable in the woods near Hermit Lake and at our snow study plots. Up in the Ravine, the effect is similar although not as pronounced. We are still in the Moderate range; however, we are at the lower end of the spectrum. The possibility for a person to trigger an avalanche does exist in the greater Lip area, including the Sluice and far right side of the Headwall. As one moves farther away from the Lip, this hazard gradually diminishes. Today we hope to get up into the Ravine to see firsthand what effect the past couple days has had on the slabs we're concerned with. Elsewhere in Tuckerman and Huntington, the dominant surface condition is hard windslab and old surface. Skiers yesterday lapped Right Gully, and reported good conditions for making turns. This fits with what we have found with Right Gully being slightly softer than in Hillman's Highway and Left Gully.

A look at the radar this morning shows a swath of precipitation down south of the mountains in the Seacoast and Massachussettes. Unfortunately, this isn't going to make it up here, and there isn't much more coming in the next few days. Possibly some good news is that the National Weather Service is beginning to hint at a system developing for the coming weekend which may bring us some precipitation. We'll be sure to keep our eyes on its development and let you know how it may affect the Ravines.

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 large 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.

Jeff Lane, 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.

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