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Avalanche Forecast

Archived

Jan 30th, 2015–Jan 31st, 2015

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

Glacier.

Move into big terrain with caution. Stability is improving but avalanche problems still linger.

Weather Forecast

A temperature inversion will trap clouds in the valleys today, with sunny periods up high. Slightly warmer temperatures today with an alpine high of -2.  A front moving north of Rogers Pass will bring up to 5cm of snow tonight with moderate W winds. High pressure and clear skies return Saturday before another frontal system arrives Sunday morning.

Snowpack Summary

A surface curst is breakable over dry snow up to 2400m. Outflow winds have created grabby surface conditions in the alpine.  The Jan15 surface hoar layer down 60-90cm is becoming more stubborn to trigger. The Dec 17 surface hoar/ crust complex is down 130-180cm. Large isolated cornices have formed.

Avalanche Summary

A small solar avalanche cycle yesterday afternoon released a size 2 on Avalanche Crest. Several small solar releases were observed on step S-SW aspects around exposed rocks and cliff areas.

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.