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Avalanche Forecast

Archived

Feb 26th, 2016–Feb 27th, 2016

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

Regions

Little Yoho.

Keep an eye on the weak layers that are still a concern in isolated areas. Dig down to evaluate these layers before trusting  the snowpack especially in sheltered areas around treeline.

Weather Forecast

Following warm temperatures and crust formation to treeline on solar aspects Friday, a cold front that will pass overnight will bring cooling, clouds, and up to 5cm of snow. While daytime freezing levels may approach 2000m Saturday, continued cooling, cloud and a bit of snow can be expected into Sunday as a second cold front reaches the divide. 

Snowpack Summary

Suncrust exists on steep S and W aspects. Otherwise, 20-30 cm of low density snow overlies a well settled mid-pack. The Feb 11 surface hoar can be found down 50-60 cm in isolated locations around treeline and produces moderate test results. The Jan 6th layer (down 80-120 cm) is gaining strength and producing hard to no results.

Avalanche Summary

Loose wet snow avalanches up to size 1.5 observed on Wednesday through Friday as a result of solar heating, otherwise no recent slab avalanches reported. Note that many recent slab avalanches were reported in the last week in the neighboring Banff, Yoho & Kootenay bulletin region.

Confidence

Due to the number of field observations

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.