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Avalanche Forecast

Archived

Nov 17th, 2015–Nov 18th, 2015

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

Regions

Little Yoho.

Avalanche control planned for Sunshine tonight, Bosworth, and Mt. Stephen on Wednesday. Depending on results we may also do Simpson, Whymper, and clean up on Sunshine. Please no recreational activities in these areas on Wednesday.

Weather Forecast

The cold front passes by midnight: the snow should end, temperatures continue to drop, and winds should taper.  For Wednesday, expect isolated flurries and lighter winds from the W  gusting to 50 km/hr. Stable weather is forecasted for the remainder of the week with 2 nights of -18C temperatures (Thur & Fri) and warmer for the weekend (-12C),

Snowpack Summary

At treeline in the Emerald Lake slide path there was 115 cm of snow and 60 cm at 1500 m. 30 cm low density snow fell so far today and overlies a suncrust found 2000 m and below. Field tests show moderate failures with potential for propagation at the new storm interface and a harder sudden collapse near the base of the snow pack.

Avalanche Summary

Poor visibility today. Only small avalanches ski cut in the Sunshine area, nothing stepping down to deeper layers. In the alpine, expect some activity where the winds have been moderate SW all day and loose snow avalanche can be expected in steep gullied terrain.

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.

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.

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.