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Avalanche Forecast

Archived

Feb 25th, 2021–Feb 26th, 2021

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

Regions

Glacier.

The snowpack is still adjusting to the major storm it was slammed with early in the week.

There's more snow today, and great skiing everywhere... might as well keep it mellow.

Weather Forecast

A couple of low pressure systems will keep the weather unsettled until the weekend.

Thursday: Snow (10-15cm), Alpine high -8*C, strong SW winds

Tonight: Flurries (5-10cm), Low -9*C, light to occasional gusting strong SW winds

Friday: Cloudy with isolated flurries, High -10*C. Light SW wind.

Saturday: A mix of sun and cloud, Low -16 C, High -12 C.

Snowpack Summary

New snow (15cm and counting) is covering settled storm snow, and a thin suncrust on steep solar aspects. The 80mm of precip, and extreme S'ly winds from earlier in the week sits on the Feb 14 drought interface (a wind crust in exposed areas near Rogers Pass, and buried windslabs/facets as you move East or West).

Avalanche Summary

Helicopter control in the West of the park produced several size 3.0 avalanches on N and S/SE aspects Wednesday.

There were a couple reports of skiers triggering pockets of windslab to the East on Wednesday.

Monday and Tues saw a torrent of large natural and artillery-controlled avalanches to sz 4, running full path out onto valley bottom fans.

Confidence

Forecast snowfall amounts are 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.

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.