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Avalanche Forecast

Archived

Dec 2nd, 2014–Dec 3rd, 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 possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Little Yoho.

Travel is very difficult in the Little Yoho forecast region because of an unconsolidated snowpack. If you re fortunate enough to get up high, be vigilant in your route choices, the Nov crust is very susceptible to triggering. AB

Weather Forecast

A slight warming trend has come over the forecast region. Light snowfall on Firday will likely not amount to more than a few cm's. This will not have a drastic affect on the danger rating.

Snowpack Summary

55cm of storm snow overlie a crust (Nov 6), which is only 15cm above the ground. For the most part the snowpack lacks cohesion and forecasters were breaking through on skis to the ground. Consistent whumphing as forecasters skied below Mt. Field today.

Avalanche Summary

No avalanche activity was observed or reported in the Little Yoho region today.

Confidence

Due to the number and quality of field observations on Tuesday

Problems

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.

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.