Avalanche Forecast

Archived

Jan 15th, 2015–Jan 16th, 2015

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 unlikely, human triggered possible.

Treeline

Natural avalanches unlikely, human triggered possible.

Below Treeline

Natural avalanches unlikely, human triggered possible.

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely, human triggered possible.

Below Treeline

Natural avalanches unlikely, human triggered possible.

Regions

Little Yoho.

Beware of the prominent surface hoar layer which is down 40-50 cm. This layer is reactive to human triggering.

Weather Forecast

Mainly cloudy with isolated flurries through to Friday. Westerly flow with moderate to strong ridge top winds. Freezing levels at valley bottom.

Snowpack Summary

The main concern in the snowpack is the Dec 18 surface hoar layer down 40-50 cm. This layer is very prominent and is producing moderate test results. This layer remains prime for human triggering. Sun crust forming on steep solar aspects and new surface hoar forming in sheltered areas.

Avalanche Summary

No new avalanches observed or reported in last 48 hours.

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.