Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:06 a.m., Thursday, March 8, 2007

Tuckerman Ravine has CONSIDERABLE, MODERATE and LOW avalanche danger today. The Lip has Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain. Right Gully, the Bowl, and the Headwall have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steep terrain. Left Gully, Hillman's Highway, the Lower Snowfields, and the Little Headwall 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.

We're back in the clouds again this morning and a few scattered flurries are expected through noontime. Temperatures are on the slide and the cold front will keep the Summit high to about -20F(-29C) today. These arctic conditions are making it quite punishing to be outside and they're also preserving the snap in the windslabs that were created over the past few days. Yesterday's field observations allowed us to observe evidence of avalanche activity in most areas around Tuckerman Ravine. We also spent a portion of the day poking around on the slopes to get a feel for the new slab layers. Spatial variability is the key concept for the day as is often the case here. The Lip and Sluice provide the most concern today with a creamy surface texture that tries to lure visiting skiers and riders out into the mouth of the dragon. Areas posted at Moderate today contain the most variability and will require strong routefinding and snowpack assessment skills. Right Gully is a good example where an avalanche cleared out new snow in the bottom portion of the gully but "hangfire" remains in the area above the fracture. The Headwall also has pronounced variability but in this area the wind's effect on slab hardness and depth plays a more prominent role than recent avalanche activity. In Tucks' sister ravine, Huntington, the high winds of Monday and Tuesday judiciously removed just about all new snow from the gullies. Old surface dominates and this leads to a Low rating for all forecast areas in Huntington today. Keep in mind that even in areas rated Low, instability will linger in pockets of windslab until we see a significant rise in temps.

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 will have large scoured sections, drifting and scattered debris from the strong winds.

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.

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