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Avalanche Forecast

Archived

Jan 2nd, 2021–Jan 3rd, 2021

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.

The storm is here and natural avalanches are running far. The hazard will increase through the day. Low elevation slabs are of concern in the usual storm skiing areas

Weather Forecast

A warm front today brings 15cm with strong SW wind and temps rising. Snowfall will increase overnight with another 20cm due as a second front passes bringing cold air and wind gusting to 80 from the SW. Sunday temperatures and freezing levels will drop significantly with scattered flurries. Another 10cm on Monday as yet another front comes through.

Snowpack Summary

A new surface hoar layer (Dec 26) is preserved, in isolated areas, under 50cm of recent snow. The Dec 13 surface hoar can still be found down 100cm and the Dec 7 crust down 120 with weaker, facetted snow between them. At the base of the snowpack are several early season crusts including the prominent Nov 5 with facets in between them.

Avalanche Summary

Several avalanches to size 3 were observed yesterday on N and S aspects. Skier triggered slabs were reported from the Asulkan valley on all aspects including a skier accidental. Numerous detections from the ADN overnight.

Confidence

on Saturday

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.