Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 7:44 a.m., Wednesday, February 21, 2007

Tuckerman Ravine has LOW and MODERATE avalanche danger today. The Little Headwall and the Lower Snowfields have Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised. All other forecast areas in Tuckerman Ravine have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain.

Huntington Ravine LOW avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

Today's ratings and stability concerns are the same as yesterday's with a bit of new snow and wind loading to add into the fold as well. The Summit picked up .4" (1 cm) of new snow around midnight and it is currently snowing on the mountain. These upslope showers are expected to continue through the morning hours with minimal accumulation until drier air moves in this afternoon. Winds will be out of the WNW 45 to 60 mph (72 to 97 kph) and increase to 55 to 70 mph (88 to 113 kph) with higher gusts later today. As discussed in yesterday's advisory, stability concerns are focused on slabs that were formed on Monday as NW winds loaded snow into Tuckerman Ravine. Huntington was pretty well scoured with some scattered isolated pockets to look out for. The most recent slabs that formed in Tuckerman are somewhat inconsistent with the largest ones being in the Lip and Sluice. In other areas you will find some options for relatively safe travel routes if you know what to look for. Despite the small amount of new snow we have received since Monday, I would also be thinking about wind loading increasing the size of these slabs, particularly this afternoon when the winds pick up. A secondary stability concern has been hard slabs that are lingering from last week. I feel that these are generally going to be difficult to trigger but I have some concern about an avalanche from the more recent snow stepping down into the older hard slab resulting in a larger avalanche. The Lip area has the most potential for this to happen. Keep this in the front of your mind if you opt to travel in that area.

Another system will pass through the our area tomorrow bringing the chance of snow showers in the mountains in the afternoon. At this time, it looks like areas south of us will benefit from this more than we will. After tomorrow, the next hope for a storm comes Monday. That is all I will say about that as it is far enough out for the forecast to change several times before then.

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 is forecasted as it 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 good coverage. Expect variable conditions including scoured sections and large drifts.

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.

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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