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Avalanche Forecast

Archived

Jan 14th, 2014–Jan 15th, 2014

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 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.

Regions

Little Yoho.

Expect slopes that have not previously avalanched to be highly suspect. However, natural activity is starting to subside. The forecast region is looking at a considerable hazard rating for the foreseeable future.

Weather Forecast

There is a clearing trend developing. Between Wednesday and Friday expect sunny periods, very little precip and temps just under zero degrees. However, the deep persistent slab problem will still linger even though there will be limited inputs into the snowpack over the coming days.

Snowpack Summary

Basal weaknesses have been overloaded with accumulations of new snow (90cm+) and massive wind-loading. This new snow load has started a major avalanche cycle that has only started to taper off as of today.

Avalanche Summary

Avalanche control produce large avalanches up to size 3.5 in areas that had not been previously controlled this season. Some had enough force to break mature timber. Additionally there was a skier accidental size 2 in west bowl that caught a party of 3, one fully buried however no injuries. The evidence of a large cycle is present, even BTL.

Confidence

The weather pattern is stable

Problems

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.

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.