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Avalanche Forecast

Archived

Jan 12th, 2016–Jan 13th, 2016

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

Regions

Little Yoho.

Surface sluffs are running far and fast below treeline.

Weather Forecast

Very light precip, overcast skies and mod-strong wind from the west can be expected for the next 2 days. The wind should die down on friday.

Snowpack Summary

A total of 20cm of storm snow sits (~10cm overnight) on top of the Jan 6 surface hoar/crust. Below the Jan 6 layer lies a generally weak and faceted snowpack. Wind slabs in immediate alpine lee areas can be expected due to increased wind last 24 hr.

Avalanche Summary

A size 1.5 was observed on a steep rocky slope on Mt. Dennis today. This was probably a windslab that was triggered by a small cornice.

Confidence

Due to the quality of field observations on Tuesday

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.