Avalanche Advisory for Tuckerman and Huntington Ravines
Posted: 8:40 a.m., Saturday, January 3, 2004

Tuckerman and Huntington Ravines will have CONSIDERABLE avalanche danger today. Natural avalanches are possible and human triggered avalanches are probable. Unstable slabs are probable. Be increasingly cautious in steeper terrain.

We picked up 4 cm (1.6 in) of new 6.4 % snow yesterday with light to moderate SW and W winds. Even this small amount brought in new loading in strong lee areas. In Tuckerman we found near knee deep pockets in heavily protected locations. In Huntington climbers found the same in Central gully when decending late in the day. As of 7:00 this morning snow began again and is forecasted to change to freezing rain. There is a possibility that it could change to rain near the end of the event in the early afternoon. Between 1.25 and 2.5 cm (.5 and 1.0 inch) of water equivalent is expected, but it will all come down to temperature regimes aloft and the type of precipitation is creates. As warm air aloft becomes entrenched over the colder air below expect snow to change over to freezing rain and rain causing an inverted snopack. Freezing rain adds load but doesn't necessarily melt bonds and perculate down through the snowpack. If it does rain later expect the snow instability to rise more rapidly than the change to freezing rain. So, it will all come down to how much total water equivalant we receive and when the change over occurs. The Ravines are not currently at Considerable, but if the weather forecast plays out as expected it will get there by this afternoon. Pay attention to changing weather and change your route and plans accordingly. Expect your decent routes to have a higher avalanche danger later in the day.

Some clearing is anticipated late in the day before the next system bringing snow in tomorrow.

The John Sherburne ski trail has variable conditions. Expect variable conditions with areas of ice, some blowouts, abrupt water bars, open holes, and running water.

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.****

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.

Back to the Tuckerman Ravine Home Page

heck t¨Q