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Avalanche Forecast

Archived

Mar 10th, 2020–Mar 11th, 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 possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Avalanche hazard will increase throughout the day with the help of new snow and strong winds. The February 22nd surface hoar remains reactive to skier triggers.

Weather Forecast

Periods of snow and strong winds will accompany the passage of a warm front later today. Expect 15cm of snow with an additional 6cm early Wednesday morning. The alpine temperature will reach a high of -7.0 C with the freezing level climbing to 900m. Ridge winds will be SE 25 km/h gusting to 60 km/h.

Snowpack Summary

25cm+/- of storm snow has been redistributed by moderate southerly winds creating soft slabs in exposed areas. Below these slabs, the February 22nd persistent weak layer is now buried down 60-90cm, and consists of 3-7mm surface hoar on all aspects up to 2450m, and a crust on solar aspects. 15cm of storm snow is expected to fall today.

Avalanche Summary

Several solar triggered loose snow avalanches size 1.5 -2.0 have been observed in the highway corridor in the pas 48hrs. Received a MIN report of a size 2.0 skier accidental on Avalanche Crest, occurring yesterday at 14:30, and failing on the February 22 persistent surface hoar layer down approximately 60cm.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.