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Avalanche Forecast

Archived

Dec 4th, 2019–Dec 5th, 2019

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

Regions

Glacier.

All Winter Restricted Areas are closed for Avalanche Control today. Avalanches have been running full path, this trend will continue today!

Weather Forecast

Today we will receive another 5-10cm, moderate to strong winds and seasonally warm temperatures. Clearing tonight, temperatures will cool, and winds will decrease to light values. Tomorrow a mix of sun and cloud, with flurries.  Friday, Saturday's forecast is for another 30cm!

Snowpack Summary

Approximately 60-70cm of storm snow overlies a variety of facetted surfaces, crusts or old wind slabs depending on aspect and elevation. The two main interfaces to watch for are the storm slab interface and the Nov 23rd surface hoar/ crust buried 40-60cm.

Avalanche Summary

Yesterday's Natural avalanche cycle produced numerous avalanches to size 3! With last night's additional 30cm of new snow + more snow today, warm temps, and wind, the natural cycle will continue with larger/more destructive slides running full path! Public reports of natural avalanches yesterday in the Connaught drainage burying the skin track!

Confidence

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.