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Avalanche Forecast

Archived

Jan 25th, 2016–Jan 26th, 2016

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

Regions

Little Yoho.

Conditions are tricky right now! Avalanche control results today showed widespread results between size 2 and 3. Additionally, ice climbs with exposure to avalanche terrain should be evaluated carefully - avoid them if they have not yet run.

Weather Forecast

The region is currently under the influence of a NW flow, with the main storm track to our north. Starting Tuesday afternoon a system moves into the area and we can expect 5-10 cm through the afternoon and evening with temperatures around -5 and winds from the west, 25-50 km/hr.

Snowpack Summary

40-50 cm reactive slabs overlie the January 6 weak layer, and these slabs are reactive to explosive and human triggers. The middle of the snowpack is facetted, which has been increasing the size of avalanches as they gain mass while descending. All steep gully areas should be considered suspect.

Avalanche Summary

Avalanches are running far. Monday's avalanche control work on highway 93 south resulted in widespread avalanches between size 2 and 3 with fracture lines ranging from 25-50 cm deep. In Kootenay Park, some fracture lines extended up to 350m wide and ran over 1500m.

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.

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.