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Avalanche Forecast

Archived

Jan 20th, 2020–Jan 21st, 2020

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.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

The hazard may increase if forecast freezing levels are exceeded and/or if the sun comes out.

Weather Forecast

Scattered flurries with minimal accumulation is forecast for today, accompanied by Southerly winds in the 20km/h range and a 1300m freezing level.  Treeline temps will reach a high of -3.

On Tuesday, a weak front will bring cooling temps (freezing level to valley bottom) and light snowfall (up to 5cm).

Snowpack Summary

10-20cm of settling storm snow lies on previous wind effect and small facets from last weeks cold (this may be a slab in areas where it has been stiffened by the wind). The mid and lower snowpack are generally well settled and strong. The Dec 27th surface hoar/crust persists down 100cm, but has not been reactive since the last major snowfall.

Avalanche Summary

There were a few large (up to size 2.5) avalanches from extreme terrain on MacDonald and Tupper yesterday.

Two small (size 1-1.5) soft slab avalanches where triggered by skiers at treeline on Saturday (these both failed at the interface of the recent storm snow (down 20-25cm).

Confidence

Freezing levels are uncertain

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.