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Avalanche Forecast

Archived

Feb 11th, 2021–Feb 12th, 2021

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

Regions

Glacier.

Today will likely be the coldest day of the year, especially with the wind chill.

Eliminate any risk of an overnighter if things go wrong by planning to end your day early.

Weather Forecast

This Arctic air is here to stay until at least the weekend.

Today: Sunny, Alpine High -25*C, Moderate Northerly winds.

Tonight: Clear, Low -25*C, Light NE wind.

Fri: Sunny with cloudy periods, High -17*C, light E wind.

Saturday: Sunny with cloudy periods. Low -20 C, High -18 C. Light East wind.

Snowpack Summary

Previous strong S'ly, then NW'ly, winds built slabs in exposed areas, these are facetting and softening, but remain reactive in isolated pockets. Facetting of surface snow is also making loose dry avalanches possible in steep terrain.  A weak interface of a suncrust with facets, surface hoar was buried in late January and is now down 70-90cm.

Avalanche Summary

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

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

Several naturally trigerred loose, dry avalanches to sz 2 were observed from steep terrain in the highway corridor on Tuesday.

Confidence

The weather pattern is stable

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.