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Avalanche Forecast

Archived

Dec 19th, 2021–Dec 20th, 2021

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

Regions

Little Yoho.

Watch for increasing wind on Monday which will build fresh wind slabs, especially in the alpine. Eagle Mountain and Mt Bourgeau avalanche closure zones are CLOSED on Monday for avalanche control.

Weather Forecast

Cool temps and increasing wind on Monday. The wind is expected to increase to strong from the West. Warming temps and some new snow is expected on Wednesday.

Snowpack Summary

15-25 cm of low density surface snow with extensive wind effect in the alpine and tree line. The Dec 2 rain crust is present below 2200 m and down 40-60 cm with facets above and below. The Nov 5 crust/facet interface is found near the base of the snowpack and has formed a deep persistent layer. Snowpack depths at treeline are from 120 to 180 cm.

Avalanche Summary

A size 2 skier accidental was reported to Lake Louise ski patrol. The slide occurred just outside the ski are boundary on the exit to Purple Bowl. There was no involvement but it was reported as 25m wide by 200m long. Look for further details on the MIN. Otherwise no new avalanches observed or reported.

Confidence

Due to the number and quality of field observations on Sunday

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.