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Avalanche Forecast

Archived

Dec 10th, 2020–Dec 11th, 2020

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Little Yoho.

There is uncertainty about what problems exist in Little Yoho due to lack of observations. Of note, small avalanches can run far due to the layer they are sliding on, and as the new snow starts to facet. Likely good ski quality!

Weather Forecast

High pressure will continue Friday with light winds, and no snow. Temperatures will continue to stay cool in the valley bottoms and in the alpine (-15C)

Snowpack Summary

20-40 cm of low density new snow sits on the december 7th layer of sun crust, facets or surface hoar depending on your location. This new snow came with minimal wind and seems less reactive than we had thought it might be. At the bottom of the snowpack, the Nov. 5th crust / facet layer persists. Snowpack depths are 90-150 at treeline.

Avalanche Summary

Limited observations from Little Yoho region.  No new avalanches reported.

Confidence

Due to the number and quality of field observations

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.