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Avalanche Forecast

Archived

Feb 9th, 2022–Feb 10th, 2022

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 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, human triggered possible.

Regions

Glacier.

Avalanche hazard will rise on Thursday, with high freezing levels.  Natural avalanches are possible and rider triggered avalanches are likely, especially if the clouds break and the sun feels intense.

Weather Forecast

A drying trend will continue into the weekend, with a mix of sun and cloud.

Thursday: Cloud and Sun, with Flurries, Fz lvl: possible up to 2100 m, Winds west 35-50 km/h

Friday: Sun and cloud, Fz lvl: 1100 m, Winds west 15-30 km/h

Saturday: Sun and cloud, Fz lvl: 1700 m, Winds west 10-25 km/h

Snowpack Summary

New snow today covers a variety of surfaces, including wind slabs and sun crusts. Strong southerly winds on Monday loaded lee terrain features at all elevations. Sun crusts formed on steep SE-SW terrain. The Jan 29th SH layer is buried ~50-80cm depending on asp and elev. This persistent weak layer is still reactive where it hasn't failed.

Avalanche Summary

Natural Activity Today:

Several reports of skier triggered avalanches on the Jan 29 Surface Hoar Layer in the past few days.

Bonney Moraines - 3 skier accidental, MIN, MIN, MCR, and an additional Sz 1.5 with a partial burial.

Monday: Dome exit skier triggered multiple small slides on the SH layer,

Confidence

Timing or intensity of solar radiation is uncertain

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.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.