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Avalanche Forecast

Archived

Dec 3rd, 2021–Dec 4th, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

The snowpack is stabilizing with cooling temps, but triggering an avalanche is possible, especially in loaded pockets near the top of a slope.

Saturday's forecast is for 10cm and light wind, if exceeded the hazard could quickly rise to considerable.

Weather Forecast

Cool temps and a weak pulses of precipitation this weekend.

Tonight: Cloudy. Freezing level to valley bottom. Alpine low -10*C. Ridge top winds light SW.

Sat: Flurries (5-10cm). Alpine high -8*C. Light gusting moderate W winds.

Sun: Cloudy with flurries. Low -17*C. High -15*C. Light - mod W winds.

Mon: Mix of sun and cloud. Low -18*C. High -15*C.

Snowpack Summary

A spring snowpack in early December? Below tree-line you will find a supportive crust at or near the surface of the snowpack. At treeline this crust is buried by 10-15cm of fresh snow. In the alpine, this fresh snow (up to 30cm) overlies firm surfaces from the storm early in the week. The mid and lower snowpack is rounded and well bonded.

Avalanche Summary

No new natural avalanche observed or reported on Dec 03.

The massive storm on Dec 01 produced widespread avalanches, both natural and artillery triggered, up to size 3.5, many reaching valley bottom.

Confidence

Due to the number and quality of field observations

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.