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Avalanche Forecast

Archived

Dec 23rd, 2024–Dec 24th, 2024

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.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Strong southerly winds overnight on Monday - Tuesday will rapidly build wind slabs.

Make conservative choices if the forecasted winds materialize.

Confidence

Moderate

Avalanche Summary

Limited visibility on Monday

Several natural avalanches up to size 2 were observed in the highway corridor on Sunday from steep, north-facing slopes in the alpine. These avalanches occurred due to a previous wind spike.

A natural avalanche cycle is expected on Tuesday.

Snowpack Summary

We've received ~80cm of new snow since Dec 18th. This recent snow has fallen with moderate Southerly winds which are forecast to rise rapidly overnight- Tuesday. Expect wind slabs to build quickly! A persistent weak layer is down 80-110cm. This interface is breaking down, but consists of surface hoar in sheltered locations, and a sun crust on solar aspects. The snowpack's base is comprised of several early-season melt-freeze rain crusts

Weather Summary

A series of low pressure systems will bring some precipitation and strong wind.

Tonight Flurries. Accumulation 5 cm. Ridge wind S 20 km/h gusting to 55.

Tues Flurries. Accumulation 6 cm. Alpine high -3 °C. Ridge wind SW 20 gusting to 55. Freezing level (FZL) 1600m.

Wed Mainly cloudy with isolated flurries. Trace precipitation. Alpine High -7. Ridge wind SW 20-40. FZL 1100m.

Thurs Flurries. 12 cm. Wind S 15 gusting 70

Terrain and Travel Advice

  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Pay attention to the wind; once it starts to blow, sensitive wind slabs are likely to form.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.