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Avalanche Forecast

Archived

Dec 2nd, 2014–Dec 3rd, 2014

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

Regions

South Rockies.

There are almost no observations from this region. We'd love to know what you're seeing out there, kindly send your obs to: [email protected]

Confidence

Poor - Due to the number of field observations

Weather Forecast

Synopsis: Fairly static weather pattern for another few days. It looks like the dry and cold northwest flow will be replaced by moist and warm southwest flow on Saturday. Wednesday: Freezing Level: Valley Bottom; Precipitation: Nil; Wind: Treeline: Light, SW | Ridgetop: Moderate WThursday: Freezing Level: Valley Bottom; Precipitation: Trace; Wind: Treeline: Moderate, W | Ridgetop: Moderate, WFriday: Freezing Level: Valley Bottom; Precipitation: Trace; Wind: Treeline: Moderate increasing to strong SW | Ridgetop: Strong, W

Avalanche Summary

No new avalanche activity to report.

Snowpack Summary

As we begin our forecasting season, we are working with almost no field data. If you have been out in the mountains, we'd love to hear from you. 40 - 60 cm of recent storm snow has liklley been redistributed by wind into slabs that are probably susceptible to human triggering. A weak layer (of facets over a crust) which formed during November's dry spell is now buried a metre or more down. Avalanches failing on this layer have the potential to propagate widely, leading to very large events.

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.