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Avalanche Forecast

Archived

Nov 16th, 2012–Nov 17th, 2012

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

Regions

Jasper.

Watch for early season obstacles under the snow.

Weather Forecast

2-4 cm of snow and freezing levels up to 1800m for Saturday. Lite snow on Sunday. Monday into Tuesday may bring higher snow amounts.

Snowpack Summary

Variable snow distribution in the alpine ranging from 0 - 220cm. There is consistent coverage around 60cm at treeline.  Two midpack crusts are providing good support. Below treeline, snow depths are  below critical levels to cause an avalanche.

Avalanche Summary

No new avalanches have been observed in the last week. Several slab avalanches to size 2.5 occurred approximately 10 days ago, on a glaciated NE lee aspect in the high alpine.

Confidence

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

Problems

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.

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.