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Avalanche Forecast

Archived

Jan 20th, 2017–Jan 21st, 2017

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

Regions

Little Yoho.

Watch for wind slabs or storm slabs on facets. This is still true for ice climbers at lower elevations.

Weather Forecast

Moderately cold temperatures with sun and flurries is forecast for the area.

Snowpack Summary

30-50cm of storm snow sits over a lower density snowpack of facets up to 1800m, and then over a generally well settled snowpack above this. Facet layers are observed but much less prevalent than out East. Storm slabs from the warmth and humidity are extensive in the region and recent SW winds have formed wind slabs in alpine locations.

Avalanche Summary

The Yoho area was not observed today. Yesterday, numerous observations of storm slab failing on facets were reported below treeline.

Confidence

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

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.