Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 7:21 a.m., Saturday, March 17, 2007

Tuckerman Ravine currently has HIGH avalanche danger. Natural and human triggered avalanches are likely on a variety of slope angles and aspects. Travel in avalanche terrain is not recommended. The only exception to the High rating is the Little Headwall which has open water and Moderate avalanche danger. In this area natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain.

Huntington Ravine has HIGH and CONSIDERABLE avalanche danger. Escape Hatch, South, ODell, Pinnacle and Central Gullies have High avalanche danger. Natural and human triggered avalanches are likely on a variety of slope angles and aspects. Travel in avalanche terrain is not recommended. Yale, Damnation and North Gullies have Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain.

Sweet, sweet New England! There's never a dull moment in this part of the world especially if you're willing to enjoy the weather for what it's worth. This morning our weather data is limited and fairly ambiguous. So here's what we know...At Hermit Lake we've picked up about 10"(25cm) of new snow with the top 2"(5cm) being composed of ice pellets. The Summit is currently recording sleet and freezing rain but they do not have any snowfall totals to offer. Before we even begin to talk about any other factors you should have already sensed a major red flag when I mentioned the 2" of heavy stuff that has been laid down over the snow. This is a classic inverted snowpack that tends to show pronounced signs of instability. Precipitation is expected throughout the day but in what form is the million dollar question. Many sources are saying snow but it seems that mixed precip is more likely. Up to .5"(1.2cm) of water is on deck in the atmosphere but the temperatures look like they may increase a few degrees before the low passes by this evening and temperatures drop. When this occurs we will see a shift of the winds to the NW from their current trajectory out of the SE. We expect most areas to have already seen avalanche activity before the switch when wind transport will begin in earnest. Upslope snow is likely after the passage of the low and should continue through a good part of tomorrow. Whether we get snow, mixed precip or straight out rain today, you should expect to see more stress added to a snowpack that has been put together incorrectly if stability is the goal. Unlike the majority of our days, the wind factor is playing second fiddle today to the influence of precipitation type. The blanket of ice pellets can be found on all aspects at all elevations and avalanche activity is expected in most areas. Be smart and play it safe today!

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 is open with a fresh covering of snow to hide the bare spots and rocks that melted out last week. Keep those tips out from under the junk!

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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