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Avalanche Forecast

Archived

Jan 21st, 2016–Jan 22nd, 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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Ice climbers should limit exposure to gullied terrain and overhead hazard Friday as we expect increased winds, some new snow and warmer temperatures. SH

Weather Forecast

10-15cm Friday is forecast for the Little Yoho region at higher elevations with strong winds and freezing levels between 1700 and 1900 meters. This could mean the possibility of rain at lower elevations around the town of Field.

Snowpack Summary

Building winds Thursday are continuing to move the 20-30cm recent snow, forming wind slabs at treeline and above. The overall snowpack has become weaker from the facetting process but is still supportive. Below treeline snow was still unaffected by wind or temperature in this region Thursday, but this could change quickly with incoming weather.

Avalanche Summary

Small sloughs were noted in Little Yoho today, but no new avalanches were reported. Avalanche control on Mt. Bourgeau produced numerous avalanches size 1- 2 , one of which started as a wind slab and entrained all of the facets in the track, hitting the road. This is consistent with other observations this week from thin snowpack areas.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Friday

Problems

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.

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.