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Avalanche Forecast

Archived

Jan 16th, 2019–Jan 17th, 2019

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

Regions

Glacier.

The temperature inversion is dissipating and the return of sub-zero alpine temperatures is here.

Weather Forecast

A mix of sun and cloud for the day with a chance of isolated snow flurries with an alpine high of -6, light ridge top winds and a freezing level rising to 1300m. Snow starting on Friday with accumulations up to 20cm by Saturday evening accompanied by 30-60kph SW winds.

Snowpack Summary

A temperature inversion has promoted snow settlement at tree-line and alpine elevations. A crust has developed on steep solar aspects, while surface hoar has been observed up to 20mm in sheltered areas. The Jan 2 freezing rain crust is down ~90cm while the Nov 21 interface is down ~180cm.

Avalanche Summary

No new avalanches were observed in the last two days. Frequent Flyer left debris across the skin-track up Connaught Creek on Sunday during a sun-induced natural avalanche cycle, while numerous slab and loose avalanches to size 3 were observed on Sunday in the highway corridor.

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.