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Avalanche Forecast

Archived

Nov 6th, 2019–Nov 7th, 2019

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

Regions

Little Yoho.

Recent wind and persistent slab activity in the region over the past few days.

It's still early, ski and ride with care as rocks, stumps and open creeks would be an easy way to end the season.

Thanks to those who are posting on the MIN.

Weather Forecast

A mix of sun and cloud for Thursday, light to moderate SW winds, daytime high of -2 with no snow in the forecast. Friday will see cloud and light flurries throughout the day.

Snowpack Summary

20-30 cm in the past 3 days in the Bow Summit area, accompanied by strong winds produced wind affected snow in the alpine. Treeline snow depths range from 60-70 cm, and up to 110 cm in lee areas. Today's field trip found the October crust present in some areas and has been the failure plane in recent skier involvements.

Avalanche Summary

Numerous dry loose avalanches in the region today from steep rocky terrain triggered by solar input. Received a third hand report of a full burial in the Observation Peak area on Sunday afternoon, no injuries. Size 1.0 skier remote also occurred in the same area yesterday. Explosive work on Mt. Stephan triggered windslabs sz 2-2.5.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.