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Avalanche Forecast

Archived

Dec 26th, 2016–Dec 27th, 2016

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

Regions

Little Yoho.

Small inputs of wind and snow over the next 3 days will maintain the current danger ratings.

Weather Forecast

Light amounts of precip amounting up to 10cm is expected over the next few days. Steady moderate west winds are expected throughout the same period at the 3000m level.

Snowpack Summary

In general, 10-30 cm sits over the very weak Dec.19th facets. However, slabs up to 60cm have been observed over this same layer at high elevations. The Nov crust is 30-80cm deep. While it is not currently producing avalanches, we expect it to do so with more snow load.

Avalanche Summary

Numerous size 1.5 avalanches were observed between Bow Summit and Lake Louise on peaks such as Observation and Crowfoot. These slides appeared to be 24-48 hours old. Some other slides were observed on a flight today up to size 2.5.

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

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.