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Avalanche Forecast

Archived

Feb 12th, 2020–Feb 13th, 2020

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

Glacier.

A slightly heavier blanket of snow overlies the recent low density fluff, setting up the possibility of surface slab failure.

Shooting cracks under your skis/boards are great clues to pay attention to today!

Weather Forecast

A short-lived ridge today gives way to unsettled flurries for the next few days.

Wed - Mix of sun and cloud, light W'ly winds, alpine high of -8*C

Thurs - Flurries amounting to 10cm. Light SW'ly winds gusting moderate. Alpine high of -7*C.

Fri - Continuing flurries, 5cm. Light W'ly winds gusting strong. Alpine high -8*C

Snowpack Summary

Mild temps with light snowfall have created a soft, cohesive 10-20cm storm slab that overlies variable old surfaces. Recent mod/strong SW winds redistributed low density snow at ridge-top and exposed tree-line elevations; variable soft slab should be expected in these areas.

Avalanche Summary

Several sz 2 avalanches were noted from the N aspect of Macdonald (high elev) and the S aspect of Cougar Mtn (low elev) yesterday. A field team in the Hermit basin, as well as Fidelity, were able to ski cut the upper 10-15cm soft slabs on unsupported rolls at tree-line.

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.