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Avalanche Forecast

Archived

Jan 27th, 2017–Jan 28th, 2017

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

Regions

Little Yoho.

Although natural activity has diminished and the danger levels have dropped to moderate, human triggered avalanches remain possible with this generally weak and variable snowpack.

Weather Forecast

The west winds that picked up this morning promise to bring a band of moist weather from the coast. Expect overcast skies with the potential for light precipitation and possibly strong winds with warmer temperatures Sunday. After this weather passes expect at return to clear skies and colder temperatures Monday.

Snowpack Summary

In the Emerald Lake Slide Path, a generally weak snowpack exists. At 2000 m, in a 135cm of snowpack, the Jan 17 surface hoar layer is down 25cm with sudden planar test results - but minimal slab formation above. In the mid-pack, the Dec facets are 20cm thick and prominent, and near the ground a layer of weak facets sits just below on old ice crust.

Avalanche Summary

Monday's avalanche control in Yoho Park produced numerous size 2 and 2.5 avalanches on Mt Dennis and one size 3 on Mt Bosworth. Minimal results in KNP control on Thursday see the BYK bulletin for details. A few natural avalanches have been observed over the last week but activity seems to have diminished in the last 2 days.

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.