| Posted: 8:49 a.m., Saturday, December 27, 2003 |
Huntington Ravine 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.
The summit received a total of 35.5 cm (14 in) of snow in the past two days. Accompanying winds began from the south and were light. As the storm progressed they increased in intensity and slowly made the shift counterclockwise to the NNW where they've been constant in the 95-110 kph (60-70 mph) range. This has provided plenty of direct loading and cross-loading on many aspects. The density of the falling snow also varied during the storm. We started with high density snow as the storm evolved from the earlier rain, then lightened in density only to revert to the heavy stuff again near the end. This has made for some interesting layers, almost like a whoopie pie if you will. These variables have had significant bearing on the current slab instabilities. In many of the areas rated Moderate today the upper reaches were blasted by the wind and the lower halves are chock full of wind-transported snow. As the definition of Moderate states, these large pockets are unlikely to release naturally but could possibly go if skiers or climbers start hammering on them. As temperatures warm up you should also be on the lookout for rapidly warming pockets that will most likely be located on the heavily loaded south and southeast aspects. This solar gain could trigger some pockets that are sheltered from the wind.
If you are out digging in the snow this weekend it may be interesting to look for faceting due to the extreme temperature gradients. These squareish crystals may be found around the old surface which is now buried. If they develop into a problem we will mention it in upcoming advisories.
In addition to avalanche concerns climbers should expect running water and ice dams. Ice dams can vary in size and impact. They can range from a slight annoyance by getting your gloves wet to a significant problem flushing you down slope with a couple hundred gallons of water. Be cautious and use appropriate protection.
The John Sherburne ski trail has variable conditions due to the recent changes in temperature and precipitation. Expect new snow over 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 is 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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