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Avalanche Forecast

Archived

Nov 6th, 2020–Nov 7th, 2020

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.
Below Treeline
Below Threshold.

Regions

Little Yoho.

Strong winds have scoured the alpine and have built wind slabs in certain terrain features.

At tree line and below, early season hazards exist, thinly buried trees, rocks and open creeks require a mindful approach.

Weather Forecast

Mainly cloudy for the first day of the weekend with snow flurries accumulating up to 2cm of new snow. Winds will be 20-40km/hr from the Northeast with temperatures ranging from -12 to -3. Sunday will see a mix of sun and cloud, no new snow, light northerly winds and slightly cooler temps.

Snowpack Summary

The freezing level dropped back to valley bottom on Thursday evening leaving 5-10cm of snow on top of a 3cm supportive crust with moist snow to ground below. The crust dissipates at ~2400m. At tree line the snowpack ranges from 30-60cm deep. Expect 30 to 40cm of recent snow above 2500m with extreme S-SW winds creating wind slabs and new cornices.

Avalanche Summary

Recent natural avalanche activity up to size 2 coming from steep gullies and alpine faces. Suspect the triggers were either cornice failures or wind slabs from previous strong to extreme winds.

Confidence

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.