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Avalanche Forecast

Archived

Jan 27th, 2014–Jan 28th, 2014

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

Regions

Little Yoho.

Beautiful days in the mountains! Blue sky with sun, and a cool north wind keeping the snow surface cold. Steep south aspects today warmed up slightly, but no significant wet snow or or rockfall was observed. Tuesday looks to be a repeat . . .

Weather Forecast

The stable weather will continue for one more day, as Tuesday looks to be another beautiful mountain day. Sunny with a high of -9 and a low down to -16 overnight, light winds and no new snow. Wednesday is showing a minor system passing through the area, with the potential for 5-10 cm across the forecast area.

Snowpack Summary

The Jan 25 surface hoar layer is buried under 5 cm of snow in many areas. While not a problem now, this protected layer of surface hoar will become a weak layer in the future. Strong solar radiation has formed suncrust on south & west facing slopes. The facets at the base of the snowpack remain weak, but the  overall snowpack is gaining strength.

Avalanche Summary

No new avalanches observed in the past several days.

Confidence

The weather pattern is stable on Tuesday

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.