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Avalanche Forecast

Archived

Jan 14th, 2016–Jan 15th, 2016

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.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Watch for facet avalanches which can be triggered by skiers or climbers. There have been numerous reports of small sluffs which pick up mass and travel further than expected in confined features.  SH

Weather Forecast

A couple cm of snow, light NW winds, valley temps around -5C and  alpine temperatures in the -15C range for Friday.  Saturday we will se a switch to a W/SW flow aith light amounts of snow in the forecast.

Snowpack Summary

In general there is 10-15 cm over the Jan 6 combination of surface hoar, facets and sun crust depending on aspect and elevation. There are isolated, small wind slabs in the immediate lees of ridge crests formed over the last 48 hours. The snowpack is facetting but still supportive in this region where over a meter.

Avalanche Summary

Over the last few days facet avalanches have been reported which aren't large in size (1-1.5) but are running much further than expected. These will be of most consequence in gully features and terrain traps. Some small wind slabs have also been triggered of similar size in the alpine which were mainly running on suncrust.

Confidence

Due to the number of field observations

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.