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Avalanche Forecast

Archived

Jan 21st, 2020–Jan 22nd, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Stiffer snow under your skis is an indicator of a slab. Be very cautious of this scenario if you have a cliff or terrain trap below you; this isolated slab "cookie" may pop out, causing you to unexpectedly surf down an unplanned line.

Weather Forecast

Mainly cloudy with scattered flurries (5cm) today, accompanied by mainly light SW'ly winds, gusting up to 35km/hr. Freezing levels rising up to 1700m by midday, then dropping to valley bottom tonight. Treeline temps will reach a high of -3.

Continued cloudy conditions tmrw with isolated flurries, moderate SW winds, and freezing levels around 1200m.

Snowpack Summary

10-20cm of settling storm snow lies on previous wind effect and small facets from last weeks cold. Variable soft slab can be found in the alpine at ridge-tops and immediate lee areas. The mid-lower snowpack is generally well settled and strong. The Dec 27th surface hoar/crust down 100cm has not been reactive since the last major snowfall.

Avalanche Summary

A spike in winds yesterday caused several sz 2.5-3 natural avalanches from steep, alpine features on Macdonald in Gullies # 7, 9, and 10. Sluffing from extreme terrain was observed off Little Sifton at midday during this wind spike.

Confidence

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.