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Archived

Avalanche Forecast

Dec 5th, 2013–Dec 6th, 2013
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Weather Forecast

The arctic air is going to continue to dominate bringing cold, dry and mostly sunny conditions. The alpine temps today should range from -19 to -25 with light NE winds. Friday should be -25 to -30 with light E winds. On Saturday we should  temps of -20 to -25 with moderate N winds.

Snowpack Summary

Surface facetting is softening windslabs and new surface hoar growth is occurring. The November 28 surface hoar/crust interface is down 30-40 and the November 12 surface hoar layer is down 60-110cm.

Avalanche Summary

No new natural avalanches were observed yesterday. On Tuesday, a group reported easily ski cutting a few pockets of soft windslab in 8812 bowl. Earlier in the week, several large avalanches natural avalanches occurred. They all appeared to be 30-40cm deep, likely on the Nov 28 surface hoar/crust.

Confidence

Avalanche Problems

Wind Slabs

Strong southerly winds earlier this week, shifted to strong northerly before dropping off.  Widespread wind transport created windslabs on all aspects. They likely exist in unusual areas due to the reverse loading and may catch you by surprise.
Be cautious as you transition into wind affected terrain.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

A variety of weak surfaces, including widespread surface hoar and sun crust on steep solar aspects, make this persistent slab tricky. It may be stubborn to trigger but recent avalanches on this layer have been large and propagated widely.
Dig down to find and test weak layers before committing to a line.Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3