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Avalanche Forecast

Archived

Feb 17th, 2015–Feb 18th, 2015

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.

Regions

Little Yoho.

Field observations are limited in the Little Yoho region. Please consider forecasters are operating with low confidence based on low number of recent field observations.

Weather Forecast

Clear skies and temps around -10 are expected on Wednesday. A small system is moving into the forecast region on Thurs and Friday. Small amounts of precipitation are expected, somewhere in the neighborhood of 10cm. This will have little effect on the danger rating.

Snowpack Summary

Above 2000m, soft wind slabs have formed on many different aspects. 60-80 cm of settled storm snow at treeline and above overlies a generally settled snowpack. Some snow pits have found facets at this storm snow interface. Below 1800m a breakable surface crust exists on all aspects which becomes supportive and stronger at lower elevations.

Avalanche Summary

No new avalanches were reported today in Little Yoho, however our field teams haven't had good observations from this area for a week or so.

Confidence

Due to the number of field observations

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.