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Avalanche Forecast

Archived

Jan 11th, 2020–Jan 12th, 2020

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 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.

Natural activity is slowing but human triggered avalanches are still possible

Weather Forecast

Flurries today accumulating to 5cm of snowfall with light winds from the SW. Freezing level 800m and an alpine high of -9 today. Tomorrow trace snow and falling temperatures with light S winds. Monday temperatures will drop below -20 with flurries.

Snowpack Summary

The recent snow has settled to around 80cm over the Dec 27th surface hoar or crust depending on aspect. Triggerable interfaces exist within that 80cm Including a thin crust 10-20cm above the Dec 27th layer. The mid and lower snowpack have been gaining strength but the load over early season crusts has increased significantly this week.

Avalanche Summary

The snowpack is still adjusting to the new load. The natural avalanche cycle has slowed with less activity observed yesterday. Numerous natural and explosive triggered avalanches to size 3.5 this week.

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.