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Archived

Avalanche Forecast

Dec 28th, 2020–Dec 29th, 2020
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
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: Little Yoho.

The snowpack is stabilizing well after last week's storm. Despite the recent wind effect up high, nice powder snow conditions exist at treeline and below. We continue to track the persistent weak layers and do not fully trust them yet.

Weather Forecast

A ridge of high pressure over the region will keep skies mostly clear, temperatures cool and winds light on Tuesday - looks like an awesome day! Another system will move over the area on Wednesday afternoon, bringing overcast skies and a few flurries but no significant accumulation is expected.

Snowpack Summary

Small amounts of new snow now bury wind slabs created by recent 25-45km/hr SW-W winds redistributing the 30-60cm of snow from the past week. The Dec 13 and Dec 7 sun crust/surface hoar/facet layers are down ~ 50cm and ~80 cm respectively. The decomposing Nov crust/facets sits at the bottom of the snowpack. Height of snow at tree line is 120-170cm.

Avalanche Summary

Two new small slab avalanches observed in Paradise Valley, both in the alpine and both size 1 windslabs. Otherwise, a detailed look at a lot of terrain over the last few days shows very little recent activity (last 48-hours), but lots of evidence of avalanches that occurred within the last week and are now buried with small amounts of new snow.

Confidence

Avalanche Problems

Wind Slabs

Old windslab formed last week are are now buried with new snow, expect to find small, spotty slabs as you enter open areas at Tree Line and into the Alpine.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

There are a variety of weaker layers down ~50-80cm. These are the Dec 7 and 13th layers of facets, suncrust, and isolated surface hoar. These layers deserve constant suspicion, they can change quickly from one aspect to another.

  • Dig down to find and test weak layers before committing to a line.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5