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Avalanche Forecast

Archived

Dec 15th, 2020–Dec 16th, 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 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.

If the wind reaches forecasted values, our hazard will rise to CONSIDERABLE in the Alpine.

Weather Forecast

We're in store for an active weather week, with a series of fast moving storms set to move across BC.!

Today: 10cm new snow, mod-gusting strong wind from the SW, FL 900m

Tonight:10cm new snow, strong wind from the SW, FL 800m

Tomorrow: 5cm new snow, moderate wind from the SW, FL 1000m

Snowpack Summary

The lower and mid snowpack is relatively strong, with the Nov 5th Cr currently unreactive to stability tests or skiers. The upper snowpack is stitched together by multiple surface hoar layers, including another one buried on DEC13th. New snow is slowly building a slab over the aforementioned SH layer, and could become reactive today, or tomorrow.

Avalanche Summary

No new avalanches were observed from the HWY corridor yesterday. MIN reports of a natural cornice fall triggering a size 2.5 off of Mt. Bonney, and a Skier Controlled size 1.5 on Lookout Couloir. Ongoing reports of sluffing in steep terrain, primarily on solar aspects where a firm bed surface exists.

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.

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.