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Avalanche Forecast

Archived

Jan 14th, 2021–Jan 15th, 2021

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, 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.

Regions

Glacier.

The storm is over and the sun is out. Use a cautious approach to moving into avalanche terrain today. Keep in mind where surface hoar may linger under the slab.

Weather Forecast

Cloudy with sunny periods and no precipitation.

Alpine temperature: High -7 C along with ridge wind southwest: 15 km/h gusting to 40 km/h.

Freezing level around 800 metres.

Friday brings a return to flurries with accumulation around 6 cm.

Alpine temperature: High -6 C with ridge wind west: 25-40 km/h and a freezing level of 1200 meters

Snowpack Summary

A 40cm+ fresh storm slab covers a thin crust from sun and/or rime in exposed terrain. Sheltered terrain at and below treeline harbours surface hoar up to 10mm under the slab. The spotty Dec 26 surface hoar is down 70-90cm. The Dec 7th surface hoar/suncrust/facet layer is down 1.5m+. Crusts with facets persist at the base of the snowpack.

Avalanche Summary

Yesterday's wild storm brought a pronounced natural avalanche cycle with slides to size 4 just west of the park and off Mt MacDonald. Avalanche control was very successful with numerous size 3 avalanches.

Confidence

Due to the number of field observations

Problems

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.