| Posted: 9:24 a.m., Monday, February 9, 2004 |
Huntington Ravine has LOW and MODERATE avalanche danger. All forecasted gullies with the exception of Yale have Low avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised. Yale gully has Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Unstable slabs are possible on steep terrain. Use caution in steeper terrain.
In both Tuckerman and Huntington Ravines the areas posted at Low do have isolated pockets of instability. Realize that "Low" does NOT mean "none".
After several days of blowing snow, freezing fog, and obscured skies it has finally cleared offering good visibility into the Ravines. Yesterday's high winds scoured many areas in Huntington, but it appears the crust protected the previous snow from blowing out of the gullies in most locales. These high winds moved snow down low into the fan creating some instability appoaching some of the northern routes. This is particularly true of Yale Gully, hence the Moderate rating. Tuckerman has picked up a lot of new snow due to the summit receiving 30cm (12in) over the past 6 days. This precipitation with moderate to high W-NW winds is the ideal scenario to pick up maximum depths in the Ravines. Receiving 30 cm over a week is better than getting it all at once due to slow loading allowing for stabilization. On Saturday we headed into the Ravine and decided to turn around at Connection Cache due to knee deep snow on the hike up and the significant loading that was occuring. This continued Saturday evening into Sunday morning when we decided to move the Lip to High. No crown lines were visible this morning, but I strongly believe some avalanche activity occured due to the volume of snow being brought in by W, WNW, and NW winds. We will head into Tuckerman later today to look for avalanche evidence such as debris or lower crown lines. I would be a bit conservative until new loading has some time to consolidate. This is particularly true on ESE and SE aspects which are directly in the lee of WNW and NW winds from the past 36 hours.
The John Sherburne ski trail has new 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: | ||
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Avalanche Advisory Archives.
United States Avalanche Danger Descriptions.
Échelle Canadienne de risque d’avalanche.
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