Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:46 a.m., Saturday, February 14, 2004

Tuckerman Ravine has MODERATE and CONSIDERABLE avalanche danger. Hillman's Highway, Left Gully, Right Gully, Little Headwall and the Lower Snowfields 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. All other forecast areas in Tuckerman have Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Unstable slabs are probable in steep terrain. Be increasingly cautious in steeper terrain.

Huntington Ravine has 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 Summit received another 3cm (1.2") of snow over the past 24 hours with accompanying winds out of the west at 104-130kph (65-80mph). These conditions have mirrored those of the past week which have continually added to the snowpack of both ravines. Visibility has remained poor during the past few days and rarely have we been able to get a glimpse of the new loading. Muted fracture lines have been observed during these windows only to be covered up by the next clearing. The greatest direct loading has occurred on E, ESE and SE aspects while other aspects have picked up snow through crossloading. While some areas have formed windslab, others have been scoured and severely wind effected. Explorations into the ravines yesterday encountered thigh-deep snow in some places with some of the deepest drifts down low. More snow showers are expected today with accumulations forecasted for 2.5-5cm (1-2"). West winds will continue to transport snow into both ravines creating more instability. By later in the day we may see a rise in avalanche danger and some areas may be pushing toward the next higher rating.

Today is a good day to think about what each rating really means. Before entering avalanche terrain posted at Moderate focus on the key words in the definition. For natural activity we focus on the word "unlikely". It is important to remember that although "unlikely" is certainly on the lower end of avalanche occurance it does not mean that it can't happen. The biggest concern in those areas is the introduction of humans as potential triggers. The likelihood of a skier or climber tipping the balance between stress and strength is POSSIBLE in Moderate areas and increases to PROBABLE in areas posted at Considerable.

The John Sherburne ski trail has soft and drifted snow over water ice, rocks and hard pack snow. Though the surface looks good be prepared for these hidden hazards and sudden changes in the trail.

THE LION HEAD WINTER ROUTE IS OPEN. This is a steep and challenging route. Ice axe, crampons, and the skill to use them well are necessary for safe travel. Remember, it is always easier to go up than come down.

AS ALWAYS, THIS ADVISORY IS ONE MORE TOOL TO HELP YOU MAKE YOUR OWN DECISIONS IN AVALANCHE TERRAIN. It should be used along with your own snow stability assessments, knowledge of safe travel techniques, skill in reading mountain weather's effect on the snowpack, and avalanche rescue.

Please Remember:
•   ****Any new precipitation may increase the avalanche danger, this includes wind transported snow. ****Obtain the latest weather forecast before starting out. ****For more information, contact any of the following: U.S. Forest Service Snow Rangers, AMC at the Pinkham Notch Visitor Center, AMC at the Hermit Lake Shelters, HMC at the Harvard Cabin. ****This avalanche 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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