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Avalanche Forecast

Archived

Mar 31st, 2017–Apr 1st, 2017

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

Regions

Little Yoho.

It looks like a warm, windy, stormy day on Saturday. It is probably a good day to stay conservative with your terrain choices, and minimize exposure to overhead hazard. Recently any small changes in weather inputs have triggered large avalanches.

Weather Forecast

Between 5 and 10cm of snow is forecast for Saturday with strong west winds. Freezing levels will hover between 1600 and 2000m with valley highs around 6'C. A cooling and clearing trend will start on Sunday.

Snowpack Summary

10-20cm of recent snow sits on a well settled mid-pack. In shallow areas (Field ice climbs) the base is weak and facetted. Shears persist on this facet interface. In deeper areas (Little Yoho Valley), the deep weak layers are less of a concern. Surface snow is soft in the shade, sun crust on solar aspects, and melt-freeze snow below treeline,

Avalanche Summary

A few loose wet slides were reported on Friday from the local ski areas. These occurred below treeline on South and West aspects in steep terrain as the day warmed up.

Confidence

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

Problems

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.