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Avalanche Forecast

Archived

Dec 20th, 2016–Dec 21st, 2016

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

Regions

Little Yoho.

Avalanche Control will occur tomorrow on Mt Bourgeau, Mt Stephen, Mt Field, and Mt Bosworth. No skiing or climbing in these areas.

Give the windslab/facet interface a few days to settle and bond. JPK

Weather Forecast

Relatively warm winter temperatures, a little more snow and continued westerly winds are forecast for the area. This should be good news in the long term but it is expected that the new snow facet interface will take a while to bond.

Snowpack Summary

The storm has brought us 30 cm of new snow in the Yoho area. Moderate to strong winds have created a windslab that overlays a very loose faceted snowpack. The windslab/facet interface produced easy results in our snowpack tests. The Nov crust is 30-80cm deep, and is not currently reactive.

Avalanche Summary

Monday saw an increase in avalanche activity that was not apparent today. Poor visibility may have limited observations.

Confidence

Due to the number 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.