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Avalanche Forecast

Archived

Feb 29th, 2020–Mar 1st, 2020

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

Regions

Glacier.

Weak layers in the upper snowpack are primed for human triggering. Use conservative route selection today!

Weather Forecast

Cloudy with scattered flurries and accumulation of 4 cm. Alpine temperature a high -9 C with ridge wind west: 25 km/h gusting to 50 km/h and freezing level of 1000 metres. For Sunday cloudy with sunny periods and isolated flurries an alpine temperature of -11 C and ridge wind west: 30 km/h and freezing level around 700 metres.

Snowpack Summary

The February 22nd surface hoar (SH) layer lurks below 60cm+/- of storm snow. This layer is present on all aspects and consists of 3-7mm SH. On steep solar the SH sits on top of a 2-4cm sun crust. This layer has been observed to 2450m. No other layers are currently active in the 3.5m snowpack of mostly rounded grains.

Avalanche Summary

A natural avalanche cycle occurred yesterday evening and through the night with slides up to size 3 running to valley bottom. Highway avalanche control produced slides up to size 3 throughout the highway corridor. Numerous reports of skier-triggered avalanches on the February 22nd layer to sz 1.5 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.