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Avalanche Forecast

Archived

Dec 13th, 2021–Dec 14th, 2021

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

Regions

Glacier.

Expect variable skiing in wind exposed terrain!

Soft turns can be found in sheltered areas below treeline.

Weather Forecast

After tonight's snow, unsettled weather remains bringing cloudy skies and scattered flurries.

Tonight: 4cm. Winds SE - 25-45km/h. Freezing level 600m

Tuesday: Trace of snow. Winds SE - 25-40km/h. Freezing level 1100m.

Wednesday: Trace of snow. Wind SW - 20-30km/h. Freezing level 600m.

Snowpack Summary

Rogers Pass received ~35cm of low density snow over the weekend. Extreme south winds created fresh slabs in exposed terrain features, further down into the path than you might expect. The Dec 1 crust is ~15cm thick at 1900m, buried by ~90cm and found up to 2300m. The mid and lower snowpack is generally well bonded and strong.

Avalanche Summary

No new avalanches were observed today in the highway corridor.

A natural avalanche cycle up to size 3 occurred Saturday with the new snow and strong winds. Cheops N1 ran size 2.0 and dusted the skin track in the Connaught Drainage.

There have been many reports of size 1-2 skier triggered slab avalanches in steep terrain and on convex rolls.

Confidence

Due to the number of field observations

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.