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Avalanche Forecast

Archived

Mar 21st, 2015–Mar 22nd, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

We may not have a good valley bottom freeze overnight into Sunday.  Watch locally for solar effect as this will increase the avalanche danger.  SH

Weather Forecast

Rain below 1800m Saturday night tapering off for Sunday Morning. 5-10cm in the alpine can be expected.  Freezing levels to 1700m Sunday. 

Snowpack Summary

Up to15cm of new snow from this storm in the alpine with moderate SW winds. Wind slabs up to 35cm deep are present in immediate lee areas of the alpine. The mid pack and base of the snowpack are well settled and well bonded overall. Isothermal snow below 2000m Saturday from rain.

Avalanche Summary

Numerous wet avalanches below treeline today in the afternoon due to heavy rains in the Little Yoho region.

Confidence

Freezing levels are uncertain 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 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.