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Avalanche Forecast

Archived

Mar 6th, 2020–Mar 7th, 2020

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

Regions

Glacier.

The Feb 22 Surface Hoar persistent weak layer (PWL) is becoming a low probability high consequence layer. Conservative route selection is a logical choice.

Weather Forecast

Scattered flurries with 5cm accumulation expected. freezing level rising to 1500m with an alpine high of -5C. Mostly light ridge wind with occasional gusts into moderate range.

Snowpack Summary

Storm snow is cloaking near surface windslabs in open terrain features at all elevations. Wind effect appears to be highly variable. Below these slabs, the Feb 22nd persistent weak layer is now buried down 60-70cm, and consists of 3-7mm surface hoar on all aspects up to 2450m, and a crust on solar aspects.

Avalanche Summary

No new natural avalanche activity observed in the highway corridor. A report of a size 1 skier accidental slab avalanche just above the up track skier's right of Frequent Flyer in the last 48hrs. The slab possibly released on the February 22 Surface hoar layer.

Confidence

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.