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Avalanche Forecast

Archived

Feb 5th, 2022–Feb 6th, 2022

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.

Powder Pigs were spotted rummaging around in the deep snow today, snorting and plowing their way down through the steep trees.

The storm slab will likely remain sensitive to human triggering, use caution stepping out into new terrain above tree line.

Weather Forecast

Sunday will be a mix of sun, cloud and 30-60km/hr Southerly winds. The freezing level will be up to 1500m with an alpine high of -3. More snow and wind on Monday as temperatures cool off again.

Snowpack Summary

~35cm of new snow, combined with 30-60km/hr South wind formed fresh storm slabs, especially were wind loaded. 50-80cm now buries the drought interfaces from Jan 29th - surface hoar (5-15mm) on sheltered/shady slopes, wind affect in exposed areas and a sun crust on steeper solar aspects. The Dec 1 crust/facet combo is down 1.5-2.5m.

Avalanche Summary

A report of a skier controlled size 2.0 in the Hospital Bowl area on Saturday, failing on the most recent storm interface, 20-40cm deep, 20m wide and running ~100m. No involvement.

Several other reports of size 2.0 naturals within the past 24hrs.

Avalanche control on Friday night produced results mainly in the 2-2.5 range with several up to size 3.0.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.