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Avalanche Forecast

Archived

Mar 28th, 2015–Mar 29th, 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.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

The amount of overnight freeze and solar input will be key to the danger ratings Sunday. If it does not freeze, danger ratings will be higher than listed, especially at treeline and below. SH

Weather Forecast

Freezing levels are forecast to valley bottom Sunday Morning and up to 2100m in the afternoon.  Only trace amounts of precipitation are forecast.  Winds will be moderate to Strong from the W and mainly cloudy conditions.

Snowpack Summary

Rain below 2200m for most of the day Saturday saturating the snowpack at treeline and below.  Many areas below treeline are now below threshold or isothermal.  Alpine temperatures stayed below freezing Sat.  Up to 15cm snow has formed some lee wind slabs near ridge crests. Overall the snowpack is well settled in this region.

Avalanche Summary

Lots of loose/wet avalanches today up to size 2 occurring at treeline and below with limited visibility into the alpine. 

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.