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Avalanche Forecast

Archived

Nov 27th, 2019–Nov 28th, 2019

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

Regions

Glacier.

Hazards today: Cold temperatures, short days, buried early season hazards, and a Surface Hoar Layer buried 30-50cm down from the surface.

Weather Forecast

Strong North Easterly winds are escorting an Arctic front, as it tracks south towards the US border. We may see some cloud develop throughout the day, but no actual precipitation is forecasted, with freezing levels staying well below valley bottom. It will be cold and clear tonight, tomorrow and probably for the rest of the week.

Snowpack Summary

Strong Northerly winds will try to redistribute last weekend's storm snow in the Alpine and at Tree-Line; likely with little success. Cold temperatures are also aiming to suck slab properties out of the upper snowpack. The 2 main layers to watch for are the Nov 23rd Surface Hoar, buried 30-50-cm, and the Nov 17th interface.

Avalanche Summary

No new avalanche activity was observed in the Highway Corridor yesterday or from the Back Country. Sunday's storm produced a decent natural avalanche cycle to size 3 in Rogers Pass. Avalanche activity has tapered off since the storm; with only one report of a skier triggered avalanche on Glacier Crest on Monday.

Confidence

Due to the number of field observations

Problems

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.