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Avalanche Forecast

Archived

Nov 30th, 2013–Dec 1st, 2013

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

Regions

Glacier.

The avalanche hazard is on the rise. A storm is approaching and a surface hoar has recently been buried.

Weather Forecast

A pacific frontal system is approaching the interior tonight with the bulk of it arriving tomorrow during the day into Monday morning. Light amounts are expected tonight with more significant precipitation starting tomorrow morning. This storm precedes a high pressure ridge setting up on Tuesday bringing clear skies and cold arctic temperatures.

Snowpack Summary

10cm of new snow overlies a widespread surface hoar layer and facet layer. On steep south aspects this new snow sits on a surface hoar and sun crust layer. The November 12 surface hoar layer is down 40-100 cm. The snowpack has settled quite a bit in the last week and there's less than one meter of snow in most locations.

Avalanche Summary

No new avalanches yesterday.

Confidence

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

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.

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.