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Avalanche Forecast

Archived

Dec 1st, 2019–Dec 2nd, 2019

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.

Increasing wind and some light precip should have riders and climbers thinking about stepping back from large committing features in the alpine.

Weather Forecast

Slightly warmer temperatures are expected with some increasing wind and very light precip over the day on Monday. A slightly more assertive (but not much) pulse of precip is expected Wednesday (5-10cm). Wind velocity will remain high over the next few days from the W-SW at higher elevations.

Snowpack Summary

Faceting continues. Snow surface conditions range from hard slabs to re-crystalized soft snow with little wind effect. The Nov 8 crust is down 20-30cm up to 2400m which is facetting over time. The lower snowpack is a mix of weak facets & crusts. Snowpack depths at treeline vary from 60-90 cm with up to 140 cm in lee areas.

Avalanche Summary

Sunshine Village ski patrol reported ski cutting hard wind slabs from size 1 to 1.5 in the low alpine today. In one instance, it was reported that the wind slab stepped down to the Oct crust on the flank of the avalanche.

Confidence

Wind speed and direction is uncertain on Monday

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.