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Avalanche Forecast

Archived

Dec 27th, 2019–Dec 28th, 2019

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

Regions

Glacier.

Triggering of large avalanches is still possible. Select your routes carefully.

Weather Forecast

Flurries of snow today and tonight with light W ridge top winds, freezing level below valley bottom and an alpine high of -11. Saturday and Sunday are looking similar with the freezing level rising to 1100m by Sunday.

Snowpack Summary

5-10cm HN24 fell on top of yesterdays SH and the 80 to 120cm that is now over the Dec 11th SH (5-12mm). Slabs have formed in the lees of ridge crests and a thin crust on steep solar aspects is now under the new snow. Early season crusts still persist in the lower snowpack.

Avalanche Summary

Natural activity was observed yesterday out of both N and S facing terrain to size 2.5. Several natural avalanches were observed from the steep, N-facing gullies on MacDonald the day before, all running to the top of their respective fans. No new avalanches reported from the backcountry.

Confidence

Due to the number of field observations

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.