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Avalanche Forecast

Archived

Mar 6th, 2020–Mar 7th, 2020

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

Regions

Little Yoho.

Cornices have grown with recent snow and winds, limit your exposure time to overhead hazards.

Great snow quality in sheltered locations!

Weather Forecast

The snow fall continues, with accumulations ranging from 10-15cm by Saturday evening. The winds will be moderate from the South and the temps will range from -5 to -15. Cooler temps, moderate winds and clearing skies for Sunday into Monday.

Snowpack Summary

50-70 cm has fallen in the past week with strong Westerly winds. Expect to find wind slabs in lee areas and exposed terrain features. The recent snow is piling up and buries sun crust on steep solar aspects and the Feb 1 crust in isolated areas up to 1900m. Generally this area has a strong snowpack, with snow depths over 300 cm in the alpine.

Avalanche Summary

Reports of two deep persistent slab avalanches on Thursday in the alpine from South to East aspects; a sz 3 triggered by cornice fall and a sz 2.5 from explosive avalanche control.

Several natural storm slabs up to sz 2.5 observed along highway 93S Wednesday where intense wind loading was occurring.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Saturday

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.