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Avalanche Forecast

Archived

Dec 11th, 2019–Dec 12th, 2019

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

Regions

Little Yoho.

Great conditions can be found in the northern part of the forecast region. Keep an eye out for changing conditions, especially increase winds as there's a significant amount of snow available for transport.

Weather Forecast

Flurries will continue till the end of the week amounting to10cm of snow by Friday.  I slight increase in wind values at alpine elevations is expected Thursday but will quickly dissipate by early Friday. Generale steady temperatures around -7 are forecasted till Friday.

Snowpack Summary

Snow amount vary through the forecast region. Areas north of the HWY1 (little Yoho) received 50-70cm last week creating a well developed early winter snowpack. These typical deeper snowpack areas have few faceted layers and are begging to form a settled mid pack. Around Field the snowpack is much shallower resembling the Banff forecast region.

Avalanche Summary

A few natural avalanches were observed in Little Yoho Wednesday that appeared to have released in the last 24 hours. One notable size 3 failed immediately below ridge crest on a steep alpine feature that appeared to be a wind slab releasing on the recent storm interface.

Confidence

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.