| Posted: 8:13 a.m., Sunday, March 4, 2007 |
Huntington Ravine has CONSIDERABLE and HIGH avalanche danger today. The Escape Hatch has Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Be increasingly cautious in steeper terrain. All other forecast areas of Huntington Ravine have High avalanche danger. Natural and human triggered avalanches are likely on a variety of slope angles and aspects. Travel in avalanche terrain is not recommended.
The mountain did well with 2.4"(6.1cm) of new snow at the Summit over the past 24 hours and about twice as much near the base of both Ravines. Some areas got substantially more and we measured 9.4"(24cm) of new snow at the entrance to Huntington this morning. Snow showers will continue through the next 36 hours and we will likely see another 2-3"(5-7.5cm) of snow today. Winds will blow out of the NW with moderate speeds that are ideal for both wind transport and whiteout conditions. The wind is currently out of the W at 55mph(89kph). New snow will continue to be light and fluffy with current densities around 5-6%. The combination of these conditions will create soft windslab in the start zones that will react enthusiastically to human triggers. An added concern is the presence of a light to medium density underlying slab that was created on Friday and capped by a thin breakable raincrust. This crust may act as a bed surface for today's avalanche activity with loose unconsolidated snow and new windslab completing the layers above. There is also the potential for today's slides to step down below the crust and pull out the deeper slab. We found evidence of avalanche activity in this layer yesterday morning including a potentially human triggered slide in the Lip. Though we don't know too much about the circumstances it appears it was triggered by snowshoers descending the Lip under the cover of darkness. A self rescue likely ensued as evidenced by an excavation hole and it appears that no one suffered any substantial injuries.
The Lion Head Winter Route is open. This is a steep and challenging route. Crampons, an ice axe, and the ability to properly use this equipment are necessary for safe travel on this route. The John Sherburne Ski Trail is open and has generally good coverage with new snow covering most of the trail.
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Avalanche Advisory Archives.
United States Avalanche Danger Descriptions.
Échelle Canadienne de risque d’avalanche.
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