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Avalanche Forecast

Archived

Feb 14th, 2015–Feb 15th, 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 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.

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

Tricky conditions continue. Cooler temperatures are on the way, but it will take some time for the snowpack to become less reactive. Solar input will augment the snowpack problems. SH

Weather Forecast

Cooler temperatures are finally arriving for Sunday with -6C at valley bottom and -10C or cooler in the alpine. Light gusting moderate N-NW winds and a mix of sun and cloud. Seasonal temperatures will persist for the next few days.

Snowpack Summary

60-80 cm settled storm snow at treeline and above overlies a generally settled snowpack. Some snow pits have found facets at this interface. Recent wind slabs have formed on many different aspects at higher elevations. Isothermal snow exists below 2000m. Cooler temperatures Sunday will help overnight crust formation.

Avalanche Summary

Limited observations today in Little Yoho but a natural cycle occurred East of the Divide in Banff/Yoho/Kootenay Parks.These were mainly triggered by recent loading by N winds and sun. Click here for photos of these events. As well, a few skier triggered slides were reported over the last 2 days with limited involvement in the same region.

Confidence

Due to the quality of field observations 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.