Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:59 a.m., Saturday, January 19, 2008

Tuckerman Ravine has Considerable avalanche danger today. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain. The only exception to this is the Little Headwall which has 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 Considerable and Moderate avalanche danger today. Central Gully has Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain. All other areas have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steep terrain.

Yesterday's storm has come and gone, and this morning we're left with a good view of its effects on the ravines. Evidence of avalanche activity is visible this morning in both ravines, along with a good amount of additional loading that did not slide. Today's weather does not appear to be bringing with it much in the way of new snow or additional wind load, so our primary concerns are for human triggered avalanches on the existing slabs. The density of the slabs and the cold temperatures will work together to keep the elastic energy in these slabs, making them quite "snappy". It's interesting to take a look around Tuckerman Ravine this morning. There are some patches of hard old surface visible, as well as a few isolated areas where the wind has hammered the surface of the snow. Much of the rest of the ravine is covered in creamy white newly loaded windslab. It's these slabs that are what we're concerned with. Not only are they quite snappy, they are sitting on top of a hard, slick bed surface leftover from last weekend's January thaw. If you were to be traveling in avalanche terrain it is strongly advisable to stay on the hard old surface whenever possible. Given the patchy nature of the exposed old surface, this will be difficult to do without ever crossing over new slabs. Very careful routefinding and excellent safe travel techniques will be essential for staying safe today.

The conditions in Huntington are similar to those in Tuckerman, with a mix of exposed old surface and newly loaded windslab. Although many areas of Huntington are posted at Moderate, it's worth noting that Pinnacle, Odell, and South gullies are at the upper end of the Moderate rating. Also in Huntington today careful routefinding and staying on the old surface whenever possible will be critical for avoiding the most troublesome locations.

Remember it is a Saturday on a holiday weekend, so there is the potential for many people to be out and about on the mountain. Today is one of those days where you should be paying close attention not only to how your party is traveling in avalanche terrain, but also to what is going on above and around you.

Although the new snow is trying to cover it up, the hard old surface is poking through in places. Until it has vanished you will need crampons, an ice axe and solid self arrest skills to travel safely in steep terrain. This includes travel on the Lion Head Winter Route. The Sherburne Ski Trail is open with good coverage from top to bottom.

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 or 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.

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.

Échelle Canadienne de risque d’avalanche.

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