Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 10:46 a.m., Tuesday, December 16, 2003

Tuckerman Ravine has MODERATE AND HIGH avalanche danger. Hillman's Highway, the Lower Snowfields, and the Little Headwall have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steeper terrain. All other areas in Tuckerman have High avalanche danger. Natural and human triggered avalanches are likely. Unstable slabs are likely on a variety of aspects and slope angles. Travel in avalanche terrain is not recommended.

Huntington Ravine has CONSIDERABLE AND HIGH avalanche danger. The Escape Hatch and South gully have Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain. All other areas in Huntington Ravine have High avalanche danger. Natural and human triggered avalanches are likely. Unstable slabs are likely on a variety of aspects and slope angles. Travel in avalanche terrain is not recommended.

The summit received 9.6 cm (3.8 in) of new snow in the past 24 hours bringing their storm total to about 28 cm (11 in). Both of the ravines received substantially more due to strong wind transport. Yesterday afternoon the winds shifted around to the northwest and averaged 140 kph (85 mph) through the night. This rapidly loaded slopes especially south and southwest aspects. A crown line is visible on the Lip this morning but is quickly being obscured by newly transported snow. The winds are forecasted to diminish and continue swinging around to the west and then the south by this afternoon. If they wait to diminish until late in this shift we can expect areas that are currently Moderate to quickly approach a Considerable rating. Don't be fooled by the bluebird skies and get pulled into areas you know you shouldn't be in!

The back to back storm cycle continues with more precipitation forecasted for tomorrow. Temperature regimes are still a bit unclear so whether we get a mix of snow, freezing rain, and rain or not is still a question. We'll keep tabs on this and give more details as the storm continues to develop.

The John Sherburne ski trail has improved substantially with the new snow. Despite the good coverage you should still expect abrupt waterbars, patches of water ice, and rocks under the new snow.

THE LION HEAD SUMMER TRAIL IS CLOSED AND THE WINTER ROUTE IS OPEN.

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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