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Archived

Avalanche Forecast

Dec 3rd, 2017–Dec 4th, 2017
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Glacier.

The storm slab will be most reactive at ridgetop where exposed to wind.  Avoid exposure to other groups above or below you. 

Weather Forecast

A ridge of high pressure will build today over Roger's Pass.  Expect cloudy skies with some sunny breaks throughout the day today.  No new snow is forecast and the alpine high will be -10 with the freezing level staying at valley bottom.  Winds will be generally light from the Northwest.  The high pressure will dominate the weather through the week

Snowpack Summary

25cm of recent snow sits on the previous settled storm snow. The November 26/23rd crust layers are easily identified down 65-80cm. Recent stability tests show a generally good bond between the Nov 26 and the dry snow above. The lower snowpack is still moist but is starting to dry out with cooler temperatures.

Avalanche Summary

The storm from Friday and Saturday brought heavy snowfall and strong winds at ridgetop. This triggered a natural avalanche cycle to size 3 with some paths running to valley bottom. Friday the avalanche path 'Frequent Flyer' ran during the day, burying the skintrack 7-10m wide. A good report here.

Confidence

Avalanche Problems

Storm Slabs

Settling new snow and wind at ridgetop has created a reactive soft slab.  Compression tests yesterday showed shears in the storm snow down 15 & 30cm. In steep alpine terrain avalanches may run to the bottom of run-outs. Be aware of overhead exposure!
Evaluate unsupported slopes critically.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2