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Avalanche Forecast

Archived

Dec 25th, 2019–Dec 26th, 2019

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

Regions

Glacier.

A weak surface hoar layer can be triggered by skiers and riders in areas where the storm snow has formed a slab. When uncertainty is present, choose conservative terrain.

Weather Forecast

A high pressure system brings stable weather conditions today with mostly sun with the occasional cloud. No precipitation is expected as alpine temperatures reach a high of -10 C and freezing levels stay below valley bottom. Winds will be light from the NW. High pressure is expected to last through to the end of the week.

Snowpack Summary

The top 50cm is forming into soft slabs especially near ridge crests. A new surface crust exists on steep solar aspects. The Dec 11th SH (5-12mm) is well preserved and is now down 90-120cm. The Nov 23 SH/Cr is down 160-185cm. Early season crusts still persist in the lower snowpack.

Avalanche Summary

No new avalanches were observed yesterday.

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.