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Archived

Avalanche Forecast

Dec 7th, 2019–Dec 8th, 2019
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

The storm slab will be sensitive to human triggering given the right location. Take time to evaluate the snowpack both on the way up and the way down.

Weather Forecast

Light snowfall today with another 5cm expected tonight with a passing cold front. Cool and clear weather comes in behind the front for Sunday and the start of next week.

Snowpack Summary

30cm of snowfall in the last 30hrs rests on top of 70cm of settling storm snow from this past week. The previous storm created slabs on lee alpine features which are now concealed. The November 23rd surface hoar/crust layer is buried +100cm and remains reactive in stability tests. Tree wells are deep and deserve extra caution, buddy up.

Avalanche Summary

Avalanche control yesterday produced numerous size 3 and several size 3.5 avalanches in the highway corridor.

Confidence

Avalanche Problems

Storm Slabs

30cm of storm snow has formed a storm slab. The new snow sits atop a previous storm slab that is still poorly bonded to faceted snow and Dec 5th surface hoar layer.

  • Dig down to find and test weak layers before committing to a line.
  • The new snow will require several days to settle and stabilize.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2.5

Persistent Slabs

Storm slabs have the potential to step down to a buried weak layer (Nov 23 Surface Hoar/ Crust) now down +100cm. It consists of surface hoar at treeline and below, and a crust on steep solar aspects into the alpine.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 3