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Avalanche Forecast

Archived

Jan 24th, 2017–Jan 25th, 2017

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

Regions

Little Yoho.

Weather Forecast

Mixed sun and cloud with no snow forecast through Thursday. Winds will be light from the north on Wednesday. Freezing levels will be near the surface.

Snowpack Summary

Below 1900 metres the midpack is weak and facetted. Above this elevation the snowpack is more settled. In the alpine some isolated windslabs persist from last weeks SW winds. Snowpack tests in Emerald Lake area found isolated areas of surface hoar below last weeks storm snow. Where found, this surface hoar was producing easy shears.

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Avalanche Summary

Avalanche control in Yoho Park on Monday produced numerous size 2 and 2.5 avalanches (Mt Dennis). One size 3 was triggered on Mt Bosworth. No fresh natural avalanches in this area have been observed in past 48 hours

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.