| Posted: 9:17 a.m., Sunday, January 25, 2004 |
Huntington Ravine has LOW avalanche danger. Natural avalanches are very unlikely and human triggered avalanches are unlikely except in isolated pockets. Normal caution is advised.
At midnight last night the summit winds shifted from the WNW to the NW and increased to 120 to 150 kph (75-95 mph). Blowing snow was reported on the summit every hour up to midnight. The increase in wind speed has effected the snow stability in a variety of ways. In Huntington Ravine the winds have scoured out the gullies and old surface is visible in most of the gullies. In Tuckerman Ravine, the winds have deposited snow into lee areas, most noteably The Chute, the Lip and the Sluice. Due to the increase in winds, expect more dense slabs over less dense slabs in these places. The fracture line that was visible in the Chute on Friday morning is completely filled in. The fracture lines in the Lip and Sluice from last week are still visible but have filled in quite a bit. Areas posted at Moderate today fall in a variety of places on the spectrum. The Lip, Sluice and Chute are on the upper end of the Moderate spectrum due to the higher potential of human triggered avalanches. Keep in mind that the very cold temperatures are inhibiting the bonding process from adding to slab stability. Elastic energy is being retained in the slabs so propagation of fractures is still possible with the introduction of a trigger.
If you are heading into the mountains today, be prepared for very cold and windy conditions. The summit broke another record last night for the date, with a low temperature of -39C (-38F). While this message may sound like a skipping record (much like yesterday's message), conditions up here should not be taken lightly. The current summit temperature is -35C (-31F) with a wind chill factor of -60C (-75F). Summit winds are expected to be 160 kph (100 mph) today with "high" temperatures near -29C (-20F). These conditions make very important chores difficult, like keeping your skin from freezing and keeping your core temperature up. Be conservative in your decisions in the mountains today.
The John Sherburne ski trail has variable conditions. Expect areas of water ice and abrupt water bars. Be prepared for 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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