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Avalanche Forecast

Archived

Dec 1st, 2019–Dec 2nd, 2019

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
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.

Regions

Glacier.

Ski/ ride with care!

Recent strong northerly winds have left highly variable travel conditions in the alpine and exposed treeline. Thin snowpack conditions still exist below 1600m.

Weather Forecast

Today: A mix of sun and cloud. Freezing level at 1000m. Winds light from the south.

Tomorrow: the ridge begins to breakdown tomorrow, bringing 5 cm of snow, moderate winds from the SW, freezing levels at 900 m.

Tuesday: Storm continues with another 14 cm forecast with continued moderate SW winds.

Sunset time is currently 15:50hrs, plan accordingly.

Snowpack Summary

Cold temps are facetting the upper snowpack. Previous strong N'ly winds have redistributed last weekend's storm snow- watch for reverse loading. The main layer to watch (Nov 23rd surface hoar/ crust) is buried 25-45cm. This layer exists as a crust on all aspects below 1600m and on steep solar aspects into the alpine; surface hoar around treeline.

Avalanche Summary

No new avalanches reported from the highway or the backcountry in the last 4 days.

Confidence

Wind effect is extremely variable

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.