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Avalanche Forecast

Archived

Dec 23rd, 2019–Dec 24th, 2019

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

Regions

Little Yoho.

http://www.pc.gc.ca/apps/links/goto_e.asp?destination=

Avalanche control on Mt. Stephen, Mt Field and Mt Dennis. Please avoid any activity in these areas.

Enter terrain very cautiously and avoid exposure to overhead hazard. Avalanche conditions will take some time to improve.

Weather Forecast

Temperatures will cool over the next few days with lows dipping down to -20C. Lingering moisture will leave us with mostly overcast skies and light flurries Tuesday. Upper elevation wind values will continue to be in the light to moderate range.

Snowpack Summary

30-60cm of settled storm snow has formed storm slabs all elevations and aspects. At upper elevations evidence new wind transport is visible. Below the new snow the snowpack structure is generally weak, consisting of facets and depth hoar and a Nov crust up to 2500m. These weak layers are getting overloaded with all of the new snow.

Avalanche Summary

Widespread natural avalanche activity to size 3 on all aspects and elevations is mostly 24-48 hours old. Explosive control today continued to produce large avalanches to size 3 running full path. Evidence of light loads initialing large slabs has shown that the snowpack is primed for triggering.

Confidence

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.