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Avalanche Forecast

Archived

Jan 9th, 2014–Jan 10th, 2014

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

Regions

Northwest Inland.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Friday: Light to moderate snowfall / Moderate to extreme southwest winds / Freezing level at 600mSaturday: Flurries intensifying to heavy snowfall overnight / Strong southwest winds / Freezing level at 600mSunday: Moderate to locally heavy snowfall / Moderate to extreme southwest winds / Freezing level at 1100m

Avalanche Summary

No new avalanches reported.

Snowpack Summary

A recent profile from 1400 metres elevation on a Northwest aspect in the Hankin area shows the height of snow to be about 155 cm.Light to locally moderate amounts of new snow overlie heavily wind-affected surfaces at upper elevations and well developed surface hoar at mid-treeline and below. In some areas, the new snow has likely been shifted into pockets of wind slab in exposed terrain. The mid and lower snowpack are found to be generally gaining strength with depth until the bottom 20-40cm where weak faceted crystals may exist down to the ground.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.