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Avalanche Forecast

Archived

Dec 7th, 2019–Dec 8th, 2019

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

Regions

Glacier.

The storm slab will be sensitive to human triggering given the right location. Take time to evaluate the snowpack both on the way up and the way down.

Weather Forecast

Light snowfall today with another 5cm expected tonight with a passing cold front. Cool and clear weather comes in behind the front for Sunday and the start of next week.

Snowpack Summary

30cm of snowfall in the last 30hrs rests on top of 70cm of settling storm snow from this past week. The previous storm created slabs on lee alpine features which are now concealed. The November 23rd surface hoar/crust layer is buried +100cm and remains reactive in stability tests. Tree wells are deep and deserve extra caution, buddy up.

Avalanche Summary

Avalanche control yesterday produced numerous size 3 and several size 3.5 avalanches in the highway corridor.

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.