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Avalanche Forecast

Archived

Apr 17th, 2014–Apr 18th, 2014

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 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, human triggered possible.

Regions

South Columbia.

Avalanche danger can rise very quickly with warming temperatures and/or brief periods of sun. Be aware of changing conditions and overhead hazards.For more insight into spring danger ratings, check out our Blog Post.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Tonight and Friday: Flurries (total accumulation: 5-10cm) / Light westerly winds / Freezing level 1800mSaturday: Cloudy with sunny periods and isolated flurries  / Light southwesterly winds  / Freezing level 1700m.Sunday:  Flurries (total accumulation: 5-10cm) / Light westerly winds / Freezing level 2000m

Avalanche Summary

There have been no reports of recent new avalanches

Snowpack Summary

A recently buried, supportive crust can be found near the surface of the snowpack on all aspects and elevations except for high elevation north-facing terrain. A second melt-freeze crust buried at the beginning of April can be found down 40-55cm. This layer has been variably reactive in snowpack tests.Three persistent weak layers exist in the highly variable snowpack of the South Columbia region: The mid-March sun crust/surface hoar layer down 50-80cm and the early-March crust/facet/surface hoar layer down around 80-120cm seem to be inactive. The mid-February crust/facet/surface hoar combo is typically down 150 - 200cm. Human triggered avalanches on this layer are unlikely.  Larger triggers such as cornice fall, a smaller avalanche in motion or prolonged warming could wake this layer up, resulting in very large and destructive avalanches.

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 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.