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Avalanche Forecast

Archived

Jan 15th, 2017–Jan 16th, 2017

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

With forecasted values of snow still unreliable with the incoming storm, effects on the current snowpack is still uncertain. Any significant accumulation will increase the avalanche hazard.

Weather Forecast

A low pressure system is approaching, bringing welcomed warm temperatures and precipitation. Valley bottom temps are expected to reach above freezing through the week. As of now snow values are uncertain, precipe is expected to start Monday evening and continue till Thursday.

Snowpack Summary

A verity of surface slabs ranging from good supportive skiing to impenetrable hard slab sit over a very faceted mid pack. This slab/facet interface is the primary concern in the snowpack and has been the cause of many recent avalanches. As the incoming low moves in bringing precipitation, any significant load will dramatically affect the hazard.

Avalanche Summary

No avalanche activity reported or observed in Little Yoho today, but we have minimal observations from this area.

Confidence

Problems

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.