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Avalanche Forecast

Archived

Dec 31st, 2020–Jan 1st, 2021

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.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Glacier.

Happy New Year, and thanks for all the great MIN reports!

Days are short, give yourself extra time for your objective. We were VERY lucky yesterday to extricate a hurt visitor JUST before dark!

Weather Forecast

Today is the calm before the next storm. A transient ridge of high pressure will cross the province bringing a somewhat dry New Years' eve before the next in a series of storms arrives just before the new year.

Today: Trace of new snow, light SW wind, and the FL hovering around 1100m

Tomorrow: 11cm, FL rising to 1400m, Mod SW winds

Saturday: 25cm!

Snowpack Summary

Approximately 20-30cm of new snow has fallen over the last few days, burying another surface hoar layer (Dec 25th). Reports that the new snow is relatively right side up, with isolated storm slabs that are stubborn to trigger. This interface will become touchy in the coming days as it gets overloaded with storm snow and warm temperatures.

Avalanche Summary

No new avalanches have been observed in the highway corridor, or reported from the back country. Sluffing is possible in steep unsupported terrain features. Isolated soft slabs may be found in exposed areas at treeline and in the alpine.

Confidence

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.

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.