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Avalanche Forecast

Archived

Jan 17th, 2017–Jan 18th, 2017

Alpine
Natural and human triggered avalanches likely.
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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Little Yoho.

Ice climbers should be wary of avalanches starting in alpine and running to below treeline. Many iceclimbes in Field have large startzones above them.

Weather Forecast

Wednesday will be mainly cloudy with some light snowfall (in range of 5-10 cm). Temperatures to remain mild and winds will be moderate (with strong gusts) out of the SW. A slight cooling trend is forecasted for Thursday.

Snowpack Summary

Up to 25 cm of new snow has fallen at treeline in the past 24 hours (suspect 40-50 cm in alpine). Some cracking was observed in storm snow on Tuesday and we expect some fresh wind slabs in the alpine with the moderate SW winds. Above 1900 m the midpack is quite strong and producing only variable shears. Below 1800 m the midpack is weak and facetted

Avalanche Summary

Some fresh loose snow avalanches were observed on Mt Stephen above the ice climbs.

Confidence

Intensity of incoming weather systems is uncertain

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.

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.