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Avalanche Forecast

Archived

Feb 7th, 2015–Feb 8th, 2015

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 possible, human triggered probable.

Regions

Little Yoho.

Be mindful that the snowpack at low elevations is isothermal and human triggering is likely.

Avalanche control is planned for Mt. Bosworth, Field and Stephen. No activities in these areas tomorrow please.

Weather Forecast

Light snowfall amounts (up to 12cm) are expected over the next few days. Winds will remain light with cloud cover. The trend on the danger rating will not change drastically with the subtle input.

Snowpack Summary

45-70cm of recent storm snow sits on a crust from Jan 30 which exists up to 2300m on all aspects (higher on solar aspects).This crust interface will be a layer of failure with 20cm of additional loading in the last 24 hours. This large stress to the snowpack may cause the Nov 6th facets problem to re-emerge in shallow snowpack areas.

Avalanche Summary

No avalanches were reported or observed directly in the Little Yoho region, however, Mt. Dennis (adjacent to Little Yoho) had an extensive cycle early this morning, up to size 3. It is suspected that a major avalanche cycle has effected Little Yoho region today.

Confidence

Freezing levels are uncertain on Sunday

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.