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Avalanche Forecast

Archived

Apr 27th, 2013–Apr 28th, 2013

Alpine
Natural avalanches possible, human triggered probable.
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 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

Little Yoho.

Sunday will see little overnight freeze and continued strong winds.  Watch for touchy wind slabs and sluffing in bigger alpine terrain. SH

Weather Forecast

Continued strong westerly winds Sunday with slightly cooler temperatures (freezing levels 1500m overnight) and light flurries or showers West of the divide at lower elevations. Expect little freeze again below treeline. Sunday evening through to Monday expect 10-15cm of snow along the divide with freezing levels dropping throughout the day.

Snowpack Summary

Rain below 1900m with no freeze overnight.  Strong to extreme SW winds (up to 133kmh on Mt. Bosworth) in the alpine have created pockets of wind slab on lee features.

Avalanche Summary

Limited observations Saturday due to poor visibility but no new  avalanches reported

Confidence

on Sunday

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.