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Avalanche Forecast

Archived

Feb 13th, 2015–Feb 14th, 2015

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, human triggered possible.

Regions

Little Yoho.

http://www.pc.gc.ca/apps/scond/Cond_E.asp?oID=19299&oPark=100092

Human triggering of large avalanches is likely in many areas. Avoid all avalanche terrain. Ice climbers should be wary of warm temperatures and gullied features.

Weather Forecast

Continued warm spring-like conditions will persist into the weekend. Cloudy skies will reduce overnight recovery. Light snow and cooler conditions are forecast through Saturday.

Snowpack Summary

60 to 100 cm of stiff new snow slab and windslabs, in the alpine and at treeline, overlies an old weak snowpack that is a mixture of facets, crusts and depth hoar. Propagation of weak layers can be very wide. Below treeline, poor overnight recovery and a recent warm spell, create poor snow cohesion.

Avalanche Summary

Some natural activity was noted in the Emerald Lake area was noted today.

Confidence

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.

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.