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Avalanche Forecast

Archived

Feb 19th, 2022–Feb 20th, 2022

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

Regions

Little Yoho.

As the storm ends Sunday and cold clear weather arrives, Lingering wind slabs at upper elevations will be the snowpack primary concern.

Weather Forecast

The moist Westerly flow will end Sunday morning as an arctic high moves into the forecast region. Sunday will be a transition day with partly cloudy skies as the cold Arctic air moves in. By Monday the high pressure system will bring clear skies, light winds and frigid temperatures down into the -30s.

Snowpack Summary

Up to 50cm of new snow has fallen in the past 3 days. Strong west winds have created fresh wind slabs at treeline and above. Areas to the west received the most snow. These wind slabs may release easily on the various firm surfaces underneath. The Jan 30th surface hoar/sun crust layer exists 30-50 cm below the surface and is currently unreactive.

Avalanche Summary

The forecast team had limited observations for Little Yoho Saturday. No new avalanche activity reported.

Confidence

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.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.