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Avalanche Forecast

Archived

Feb 28th, 2016–Feb 29th, 2016

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.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

We are mostly concerned with thin areas in Little Yoho at tree line and above that will have a weaker base. Assess the snow depth carefully on each slope, watching for changes in the strength of the basal layers.

Weather Forecast

Cooler temperatures and light snow is forecast for Sunday night with a slight clearing trend on Monday followed by light flurries again Tuesday night. Temperatures will remain cool with moderate winds out of the West.

Snowpack Summary

Sun crust exists on steep S and W aspects. Otherwise, 20-30 cm of recent snow overlies a well settled mid-pack. The Feb 11 surface hoar can be found down 50-60 cm in isolated locations around treeline and produces moderate test results. The Jan 6th layer (down 80-120 cm) is gaining strength and producing hard to no results.

Avalanche Summary

No new avalanches noted.

Confidence

Due to the number of field observations

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.