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Avalanche Forecast

Archived

Dec 13th, 2020–Dec 14th, 2020

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

Regions

Glacier.

Field teams yesterday found loose sluffs to have more mass than expected, watch for terrain traps and people below you

Weather Forecast

Light snow and overcast today, tonight and tomorrow. Snowfall intensifying early Tuesday morning with up to 10cm by end of day Tuesday and 25cm by Wednesday. Wind will also pick up on Tuesday afternoon to strong from the W. The incoming system will also bring a rising temperature trend with a high of -10 today, -8 tomorrow and -7 on Wednesday.

Snowpack Summary

30cm of storm snow from Monday and Tuesday buried a variety of surfaces; surface hoar up to 10mm which is rounding in some areas; a localized thin crust from freezing rain in and around the Connaught creek drainage, and a crust on steeper solar aspects from sunny breaks. The Nov 5 crust is down between 1m and 1.5m

Avalanche Summary

Skier triggered sluffing in steep terrain yesterday was significant enough to be of concern around terrain traps.

There was a MIN report of a skier triggered small avalanche in the alpine on Friday.

Several small-large solar triggered loose dry avalanches were observed in the last few days in the highway corridor from N and S aspects.

Confidence

Due to the quality of field observations on Sunday

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.