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Avalanche Forecast

Archived

Dec 3rd, 2016–Dec 4th, 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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Some new snow and wind will improve ski quality, but really watch for new wind slab development as well as spindrifting in alpine gully features. The first real arctic air is inbound starting Monday.

Weather Forecast

Another 5-15 cm with moderate Westerly winds are possible by Sunday morning with less amounts in the East. Temperatures will start to cool by Sunday evening as winds die down and we switch to a Northerly arctic flow. Expect temperatures to go sub -20 for the first part of next week.

Snowpack Summary

10-20cm of snow over the last 24 hours with moderate to strong SW winds creating wind slabs up to 30cm thick in lee alpine areas. A mid pack crust is allowing the snowpack to carry travelers fairly well except in shallow areas. We are watching for this crust to weaken but it is not producing avalanches yet.

Avalanche Summary

No recent observations from this area

Confidence

Due to the number and quality of field observations

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.