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Avalanche Forecast

Archived

Jan 18th, 2021–Jan 19th, 2021

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

Regions

Glacier.

Areas that have been sheltered from winds are producing some great skiing right now.

Heads up in terrain that has seen wind, though. Fresh wind slabs in lee features may "pop" under a person while they drop into their line.

Weather Forecast

A mix of sun and cloud over the next few days, with a weak pulse of snow/wind Tues evening.

Today: sun/cloud, Alp high -10*C, light/mod NW winds at ridge-top

Tues: increasing cloud, brief spike of wx in pm with 5-10cm snow and mod/strong SW winds, Alp high -9*C

Wed: sun/cloud with isolated flurries, Alp high -10*C, light to gusting strong SW winds

Snowpack Summary

15-20cm covers a thin surface crust on steep solar aspects. Wind slab in Alp/TL lee features. The Jan 10 surface hoar is down 35-65cm in sheltered terrain at tree-line and below and is capped by a thin freezing rain crust in some locations. The Dec 7th surface hoar/crust/facet layer is down 1.5m. Crusts with facets at the base of the snowpack.

Avalanche Summary

Isolated wind slab releases to sz 2.5 were observed from extreme terrain on Macdonald/Tupper yesterday/overnight with the spike in the S'ly winds.

Loose/dry sluffing was observed by a field team in steep (45*), sheltered below tree-line features.

Confidence

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.

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.