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Avalanche Forecast

Archived

Mar 12th, 2015–Mar 13th, 2015

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 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 possible, human triggered probable.

Regions

Little Yoho.

A little new snow accompanied by moderate to strong winds have created windslabs and raised the danger in the alpine and at treeline. Warm temperatures and rain are still the primary concern at lower elevations.

Weather Forecast

Friday should be partly cloudy with a weak freeze in the AM but some clouds to keep the solar radiation at bay. Forecasts are calling for a short but intense storm starting Saturday around noon which should deposit 20 - 30 cm's of new snow above 2000m with rain below. Alpine winds will be moderate to strong from the W/ SW throughout the period.

Snowpack Summary

Generally a well settled snow pack exists with moist snow on solar aspects below 2000 m. Isolated wind slabs may be found near ridge tops in the alpine. Weak freezes and some rain over the last few days have caused the snowpack at lower elevations to break down quickly with daytime heating.

Avalanche Summary

No new avalanches reported or observed.

Confidence

Intensity of incoming weather systems is uncertain on Saturday

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.