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Avalanche Forecast

Archived

Feb 23rd, 2020–Feb 24th, 2020

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

Regions

Little Yoho.

Continue to avoid freshly wind loaded areas in steep terrain and enjoy the good skiing in sheltered areas. Ice climbers should watch for sluffing in steep gullies as we continue to get small inputs of new snow.

Weather Forecast

Monday will be cloudy and see a few light flurries with 2-5 cm of new snow accumulation. Alpine temperatures remain cool with highs around -14'C. Light to moderate W and NW winds are expected through the day.

Snowpack Summary

5-15cm of snow in the last 48 hrs with moderate to strong alpine winds Saturday creating fresh wind slabs in lee areas. Isolated buried sun crusts exist on steep solar aspects. The Feb 1 crust is down 20-50cm and present below 1900m. A dense snowpack with no significant weaknesses is present in most areas, but thin rocky areas have a faceted base.

Avalanche Summary

A few natural and skier triggered wind slabs in the alpine up to size 2 have been reported and observed over the last several days. Some sluffing of the new snow in steep terrain has been observed in areas that got the most new snow over the last couple days.

Confidence

Due to the number and quality of field observations

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.