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Avalanche Forecast

Archived

Jan 9th, 2022–Jan 10th, 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, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Little Yoho.

Evidence of a wind slab cycle was evident on Sunday. Human triggering remains likely.

Weather Forecast

Wx models suggest there is little respite in the wind, which will generally remain in the strong range from the W/SW for the next few days. Temperatures will be slightly warmer than seasonal but the freezing level should remain below surface. A small to moderate amount of new snow (10-20cm) is expected late on Tuesday.

Snowpack Summary

Strong wind from the SW is redistributing available snow into lee areas in both the alpine and treeline. These slabs may bond poorly to the underlying facets from the cold snap. The Dec 2 crust/facet interface is down 80-130 cm.

Avalanche Summary

Two size 2 wind slab avalanches were observed in the Bow Summit area on Sunday. Also, Massey's near Field, went size 2.5 and poured over the ice climb in the past 24 hours. Lake Louise patrollers triggered a size 2 wind slab with explosives. Please see yesterdays MIN report of the avalanche that occurred on the Dec 2 crust in the Simpson paths.

Confidence

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

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.