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Avalanche Forecast

Archived

Mar 13th, 2022–Mar 14th, 2022

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

Increasing wind and more snow on the way will create fresh wind slabs in the alpine and possibly into tree line on Monday.

Weather Forecast

A slow but steady stream of precipitation is expected between Sunday evening and Wednesday morning. Up to 25cm is expected throughout that period. Also, the wind is expected to be strong from the West on Monday. Temperatures will generally be seasonal, with valleys warming to zero in the afternoons and the high alpine ridges remaining about -10.

Snowpack Summary

15-30cm of very low density snow over a buried sun crust on steep solar aspects. Very little wind or wind effect observed today. Feb 16 sun crust down 30-40 cm on steep solar aspects. Jan 30 sun crust or facet interface down 50-80 cm. The lower snow pack is generally well settled with typical weak facets found in shallow areas.

Avalanche Summary

A large avalanche was heard near theTakakkaw Falls study plot above above the Iceline trail in Little Yoho this afternoon. Both ski areas reported very small windslabs less than size 1 in immediate alpine lee areas. No other avalanches were observed or reported.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Monday

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.

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.