Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:58 a.m., Friday, January 12, 2007

Tuckerman Ravine has MODERATE and LOW avalanche danger today. The Bowl, the Headwall, and the Lip have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain. Left Gully has Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised. Hillman's Highway, the Lower Snowfields, the Little Headwall and Right Gully have little to no snow in them so the 5-Scale danger rating does not pertain to these areas. Forecasts for these locations will begin when needed.

Huntington Ravine is still under a General Avalanche Advisory. A General Advisory is issued when instabilities are isolated within the entire forecast area. However it's important to realize that avalanche activity may occur within these locations before the issuance of a 5-scale forecast. This is a critical fact to remember. Under a General Advisory you need to make your own avalanche stability assessments before venturing into any open slopes.

Tuckerman Ravine continues to recover from last weekend's watery state, to the point where the Little Headwall only has one very small section of exposed water remaining. Overnight the winds picked up hitting a peak gust of 91mph (146kph) from the northwest, which helped to scour the snow out of the top of Left Gully and bring it down from a Moderate rating to Low. Other areas of Tuckerman Ravine didn't see such scouring, and will remain at Moderate for today. In particular, protected lee areas such as the Lip, Sluice and pockets under the Headwall ice have the greatest potential for unstable slabs to exist. In the past 24 hours, the summit has seen quite a warming shift, rising 46 degrees F (26C) since last night's minimum of -15F (-26C). This will help contribute to stability of any slabs lingering in the bowl.

Although the trend is toward stability, there is some moisture coming our way which may reverse the trend, of course it's not as much as we'd like to see. Models are suggesting around an inch which won't affect stability to a great degree, but prepare for new slabs if we exceed forecast expectations. Tomorrow we have good upslope snow potential with little guidance to amounts as of this morning. The big news continues to be Sunday evening's and Monday's weather event which is predicting 6" to 8" (15-20cm). Even a small amount of new snow brought in on the wind can accumulate quickly, so keep your avalanche eyes open.

Huntington continues to rebound from last week's devastating rain, but coverage is still scant. This still causes the "General Advisory" to be issued even though we are almost half way into January. The northern gullies have the thinnest lines compared to Central, Pinnacle, and over to O'Dells. Currently the first snowfields of concern will likely be at the bottom and middle of Central and the exit gullies of O'Dells. I mention them because they offer some of the largest bed surfaces in Huntington, but they are still isolated concerns within their entire forecast area. Remember climbs are thin in places and anticipate unusual conditions including thin ice over rock in the typically straightforward Central gully.

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.

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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