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Avalanche Forecast

Archived

Feb 12th, 2021–Feb 13th, 2021

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.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

With temps below -20 C, and daily MIN reports of skiers/riders triggering avalanches, it doesn't really seem like the time to tackle big objectives.

Weather Forecast

Temperatures will gradually warm up through the weekend as the Arctic high begins to break down.

Today: Sunny, Alpine High -17 C, Moderate Northerly winds.

Tonight: Clear, Low -18 C, Moderate E wind.

Saturday: Mix of sun and cloud, High -16 C, light SE wind.

Sunday: Sunny with cloudy periods. Low -16 C, High -15 C. Light S wind.

Snowpack Summary

Renewed Northerly winds have added to previously formed slabs in exposed areas, these are facetting quickly, but remain reactive in lees. Facetting of surface snow is also making sluffs possible in steep terrain. A weak interface of a suncrust with facets and surface hoar, was buried in late January and is now down 60-100cm. Cornices are weakening.

Avalanche Summary

Skiers triggered windslabs on the standard uptrack for Avalanche Crest yesterday.

A group of skiers had a close call Wednesday on the South face of Corbin Peak, triggering a couple of large avalanches on the Jan 24th persistent weak layer.

A skier-triggered sz 2 windslab on Bagheera was reported Tuesday.

Confidence

Due to the number and quality of field observations

Problems

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.

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.