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Avalanche Forecast

Archived

Jan 12th, 2013–Jan 13th, 2013

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

Regions

Little Yoho.

Touchy conditions exist where the wind has created soft slabs at tree-line and alpine elevations. Even though the danger ratings are Moderate, if you observe whumphing or cracking, you might want to choose a more conservative line.

Weather Forecast

The ridge of high pressure will continue for tomorrow, giving the region clear skies, light northerly winds, and cool (-15 to -20) temp's. By Monday, however, expect temp's to increase and winds to pick up to moderate/strong from the NW, bumping the avalanche hazard up again. There is still a lot of snow to be whipped around by the wind.

Snowpack Summary

Up to 50cm of recent storm snow sits atop a variety of old surfaces: surface hoar and facets at and below tree-line, and wind or sun crusts in the alpine. Storm slabs were also buried during the storm. Where the wind has redistributed the new snow, whumphing and cracking was observed today, suggesting human-triggering is still possible.

Avalanche Summary

Natural activity has decreased and no new avalanches were observed. This being said, the field team observed whumphing and cracking at tree-line elevations where there had been wind during and after the storm. There were slabs buried during the storm, so even though the surface looks fluffy, there may be hidden slabs awaiting on windward slopes.

Confidence

Due to the number and quality of field observations

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.