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Avalanche Forecast

Archived

Dec 26th, 2019–Dec 27th, 2019

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 unlikely, human triggered possible.
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.

Blue skies, holidays, and fresh snow...it will be BUSY in Rogers Pass this week. Watch for people above and below you!

A persistent slab on surface hoar, down one metre, should be on everyone's mind as they plan their day. Choose conservative lines!

Weather Forecast

Sunny this morning with increasing clouds and isolated flurries this afternoon/evening. Light SW winds at ridge-top and an alpine high of -10*C. More of the same Friday and Saturday, with sun and cloudy periods, isolated flurries, light SW winds, and alpine temps ranging from -7 to -13*C.

Snowpack Summary

Last week's metre of snow is settling into a soft slab, especially near ridge crests. A thin sun crust exists on steep solar aspects. The Dec 11th SH (5-12mm) is well preserved and is now down 90-120cm. Early season crusts still persist in the lower snowpack.

Avalanche Summary

Several natural avalanches were observed from the steep, N-facing gullies on Macdonald yesterday, all running to the top of their respective fans. No new avalanches reported from the backcountry.

Confidence

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.