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发表于 2009-12-10 06:40:41
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Dec 9, 2009 - Public Avalanche Forecasts and Reports
Dec 9, 2009 - Public Avalanche Forecasts and Reports
Sea-to-Sky
Thursday Friday Saturday
Above Treeline 1 Low 1 Low 1 Low
At Treeline 1 Low 1 Low 1 Low
Below Treeline 1 Low 1 Low 1 Low
Duffy Lake & Inland Areas
Thursday Friday Saturday
Above Treeline 1 Low 1 Low 1 Low
At Treeline 1 Low 1 Low 1 Low
Below Treeline 1 Low 1 Low 1 Low
Primary Concerns None
Special Message
Information is still limited so far this season. If you decide to head into the mountains, please post your observations on our discussion forum or send an email to forecaster@avalanche.ca. Thanks to those who have sent or posted reports
Confidence: Good
Weather Forecast
Cool and dry conditions are expected to continue for the next couple days. Tonight: Clear with treeline temperatures rising slightly to around -8. Thursday: A mix of sun and cloud with treeline temperatures steady near -8. Friday: Much of the same. Mountaintop winds should be generally light to moderate from the N-NE for Thursday and Friday.
Avalanche Activity
A size-2 skier triggered avalanche was reported in the Duffy Lake area last Sunday. It was triggered on a wind-loaded south facing slope. Several size 1 natural avalanches were also observed in this area. Similar isolated wind slab avalanches remain a possibility in steep wind loaded terrain.
Travel Advisory
Terrain to Avoid: Wind slabs are lurking in unusual places from several days of strong northerly winds. These dense or hard pockets of wind slab may be triggered by the weight of a skier or sled, but should be typically small. Avoid steep cross-loaded gullies and large unsupported slopes above terrain traps like large cliffs, jagged rocks, or abrupt transitions (bench or lake). Finally, avoid traveling under gaping glide cracks. These cracks have been reported in many areas and are largely unpredictable.
Techniques to Manage Hazard: It is generally safe avalanche conditions at this time and normal caution should serve you well. Some good snow can still be found in sheltered areas. Expect loose-snow sluffing on sufficiently steep sheltered slopes. Pull over from time to time to let this snow move by.
Snowpack
The snow surface is highly variable depending on aspect and elevation. Below treeline the surface is typically a hard crust covered with a layer of surface hoar up to 8mm in size. Closer to treeline there is a crust with 10-15cm of sugary snow above on sheltered slopes. Strong North and Northeast winds have scoured windward areas and formed pockets of dense or hard wind slab on exposed Southeast to West facing slopes. There is a strong temperature gradient in the upper 40-50cm. This is causing faceting, particularly around several buried crusts, and will be something to monitor. The mid and lower snowpack is generally well settled and strong.
Prepared by Peter Marshall |
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