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Avalanche Forecast

Archived

Dec 28th, 2020–Dec 29th, 2020

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

Regions

Glacier.

Assess your line before committing.

We currently have a complex snowpack with persistent weak layers that could produce high consequence avalanches if you were unlucky enough to trigger them.

Weather Forecast

A ridge of high pressure will give stable weather through Tuesday. A system arriving from the West will give light snowfall Wednesday.

Today: Cloudy with sunny periods and isolated flurries. Alpine High -9 C. Ridge wind light W.

Tonight: Clear periods. Alpine Low -13 C. Light W wind.

Tuesday: Sunny periods. High -8 C. Light SW wind.

Snowpack Summary

Up to 25cm of recent snowfall has buried windslabs at upper elevations, and spotty surface hoar in sheltered areas below treeline. The upper snowpack is generally well bonded. Weak layers: Dec 13 surface hoar is down 70-110cm, Dec 7 crust/facte/surface hoar layer is down 110-130cm+. The Nov 5 crust lingers near the base of the snowpack.

Avalanche Summary

Small natural and skier triggered loose dry avalanches occurred over the weekend on steeper, open slopes on all aspects and elevations.

Confidence

Problems

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.

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.