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Avalanche Forecast

Archived

Feb 17th, 2014–Feb 18th, 2014

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 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

Little Yoho.

Weather Forecast

For Tuesday scattered flurries with accumulations near 10 cm at treeline forecasted for along the Divide. Day time high temperatures of -8 in the alpine.

Snowpack Summary

The recent storm snow is settling and bonding to itself, however there is still a weak bond at the storm snow interface down 30-50 cm. South west winds in the past 48 hours have started to create touchy wind slabs in lee alpine terrain. These wind slabs are reactive to skier triggering.

Avalanche Summary

Natural and skier triggered avalanches up to size two are being observed at tree-line and alpine elevations throughout the region. A skier remote class 2 was triggered on a SW aspect near tree line in the Emerald Lake vicinity today.

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.

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.