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Avalanche Forecast

Archived

Jan 22nd, 2018–Jan 23rd, 2018

Alpine
Natural avalanches unlikely, human triggered possible.
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

Little Yoho.

Good ski conditions at treeline and below today. The snowpack this year is complex with multiple weak layers. Manage your risk by sticking to simpler terrain.

Weather Forecast

We are in the influence of a SW flow with a series of storms moving in off the coast. Expect light snow ~ 5-10 cm per day for the next three days. Temps will be cool in the -5 to -15 range with Wednesday being the warmest and winds generally light to moderate from the SW.

Snowpack Summary

Recent winds have developed windslabs on alpine lee slopes. In sheltered areas, 25- 40 cm of snow overlies the Jan 16 layer (the first of 3 weak layers). The Jan 6 is below this and is 40 -60 cm down and the Dec. 15 is deeper yet at 60-80 cm down. Each of these layers are a mix of surface hoar, facets and sun crust depending on aspect and elevation

Avalanche Summary

No new avalanche activity reported in this forecast region.

Confidence

Intensity of incoming weather systems is uncertain

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.