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Avalanche Forecast

Archived

Feb 24th, 2016–Feb 25th, 2016

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.
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.

Pay attention to the effects of the sun as the day warms up. Many loose wet avalanches were observed on Wednesday afternoon.

Weather Forecast

The ridge of high pressure remains intact through Friday bringing clear skies and light west to northwest winds. Cool temperatures overnight but the afternoon effect of the sun will be strong. Freezing levels forecast to be around 2000 m. Minor flurries expected on Saturday.

Snowpack Summary

20-30 cm of low density storm snow over-top of a well settled mid-pack. The Feb 11 surface hoar can be found down 50-60 cm in isolated locations around treeline. Where found this layer is producing moderate results. The Jan 6th layer (down 80-120 cm) is gaining strength and producing hard to no results. South aspects becoming moist in afternoon.

Avalanche Summary

Many loose wet snow avalanches up to size 1.5 observed on Wednesday, otherwise no recent slab avalanches reported. Note that many recent slab avalanches were reported in the last week in the neighboring Banff, Yoho & Kootenay bulletin region.

Confidence

Problems

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.