Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:50 a.m., Friday, February 2, 2007

Tuckerman Ravine has Low and Moderate avalanche danger today. Hillman's Highway has Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised. All other forecasted areas have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Unstable slabs are possible in steep terrain. Use caution in steeper terrain. The Lower Snowfields and Little Headwall are not posted due to a lack of snow in these areas.

All forecasted areas of Huntington Ravine have Low avalanche danger today. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.

Light snow fell yesterday during the morning hours before shutting down around 11am. This gave us just a bit of new loading with SW winds effecting some NE facing aspects. Huntington remains at Low today due to it remaining unchanged over the past 24 hours. Tuckerman offers a more inconsistent yet interesting snowpack. Although it is posted at Moderate there are stable areas peppered throughout the Ravine. The newly formed slabs are just enough in most places to be more than "isolated" within the Low definition. For instance, most of the lower 2/3's of Left gully has Low avalanche danger. But the entire center and south side of the start zone has new slab. The same concept is true in some of the Chute, across the Headwall and under the Lip. Needless to say spatial variability is the topic of the day once again. New soft slab, hard-as-steel slab with good tensile strength, and large deep isolated wind ribs deposited by Wednesday night's high winds can all be found in close proximity.

An approaching low pressure bringing moisture to the mountains late this afternoon will complicate this variability. Snow is expected through the night wrapping up during the mid-morning tomorrow. Modest amounts are still anticipated with 2-4" (5-10cm) projected. Snow should load from W winds tonight before shifting out of the NW and increasing to 90mph on Saturday. Expect and elevated avalanche danger tomorrow with temperature falling to around -10F (-23C) at higher elevations. Cold air will continue to filter in overnight into Sunday bringing temperatures to -20F (-29C).

Be sure to check out our website's "Weekend Update" feature this evening for updated information about tomorrow's weather.

The Lion Head Summer Trail is still open. The Summer Trail crosses an avalanche prone slope that is still developing. We are keeping a close eye on this slope, but as always, safe travel techniques dictate traveling across this and other such slopes one at a time.

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.

Christopher Joosen, 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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