Snow and Avalanche Weekly Summary
|Summit Area Avalanche Advisory|
During the past two days we have seen a handful of natural wind slab avalanches. Likely due to the increase in NW winds late Wednesday and Thursday.
Though not recent but noteworthy, the last human triggered avalanche was last Sunday, Nov 24th (Click for more information). This was 2 days after 8-10 inches of new snow and moderate easterly winds.
Total snow depth is 14-16" at 1,500ft and up to 2-3' in depth above 3,000ft. In areas with limited wind effect the pack is uniformly very uncohesive and faceted. The surface is a mix of a melt-freeze crust below 2,000ft and wind crusts/slabs above treeline. Wind crust and slabs are very stiff and variable in depth - from an inch thick to a couple feet.
The only type of avalanche activity we have seen for the past week has been shallow wind slab avalanches. These have been on a variety of aspects and well above treeline at the upper elevations. The last activity was Wednesday/Thursday.
The picture below shows one example of a recent wind slab avalanche, just down and left from the peak. Other examples like this can be found through the Summit region.
THIS WEEK'S WEATHER:
The last snow seen at Summit Pass was from Nov 21/22. This was a warm storm laying down 8-10" of medium density snow. Since then temperatures have been mild in the 20s F with light wind from the SE - until Thursday.
CURRENT WEATHER CONDITIONS:
Thursday morning temperatures plummeted and are currently in the single digits and minus single digits. Summit Lake is reading -8 degrees at 7am. Winds shifted to the NW Thursday morning as well and have been blowing 10-15mph with gusts in the 30s. Skies are mostly clear.
EXPECTED WEATHER THROUGH THE WEEKEND:
Cold and clear weather should remain in place through the weekend. The winds are forecast to calm down to the 5-10mph range and continue to blow from the north and west. See the Current Weather tab for updated forecasts and real-time weather data!
This is a general backcountry avalanche advisory issued for Summit Lake Area as the core advisory area(this advisory does not apply to highways, railroads, or operating ski areas).
Riding status is not associated with avalanche danger. An area will be open to motorized use in accordance to the Forest Management Plan when snow coverage is adequate to protect underlying vegetation. Backcountry hazards including avalanche hazard are always present regardless of the open status of motorized use areas.
(Updated: Dec 04, 2013 )
|AREA||STATUS||WEATHER AND RIDING CONDITIONS|
|Turnagain Pass:||Closed||Riding areas will remain closed to motorized use until snow cover is sufficient to prevent vegetation and other resource damage.|
|Lost Lake Trail:||Closed|
|Resurrection Pass Trail:||Closed||Resurrection Pass will be open to snowmachines during the 2013/14 winter when adequate snow cover is present.|
|South Fork Snow River Corridor:||Closed|
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