Date issued

Nov 5, 2017 - 3:12 PM

Valid until

until further notice

Prepared by

conrad janzen

Our information is limited but watch for isolated pockets of wind slab in the alpine. Skiing is possible above 2100m due to a buried crust down 10-15 cm that helps carry the weight of skiers, but hitting rocks or stumps is still a real concern.

Early Season Conditions
Early Season

Insufficient observations exist to reliably rate the avalanche danger. Expect shallow snow cover with thinly buried rocks and trees just beneath the surface. Avalanche danger often concentrates in gullies and other deposition areas, where windslabs may bond poorly to a weak underlying base. Deeper snow usually exists at higher elevations.

More Early Season Details

Avalanche Problem 1: Wind Slabs

What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?

This is a typical early winter avalanche problem that exists in isolated pockets where the snow has drifted into small wind slabs and the slope is steep enough to slide. Mainly a concern for ice climbers in steep gullies or walking above cliffs.

Travel and Terrain Advice
  • Be careful with wind loaded pockets while approaching and climbing ice routes.

Avalanche Summary

No recent avalanche activity has been observed or reported. Some small wind triggered sluffs were observed in steep gullies on Sunday with the potential to run quite far due to the presence of the Halloween crust.

Snowpack Summary

An average of 30-50 cm of snow at treeline with up to 100 cm in alpine locations. A crust formed prior to Halloween is down 10-15 cm helping provide support for skiers. This crust disappears on N aspects around 2500m. Alpine winds have created isolated pockets of wind slab. On glaciers be wary of the ice-snow interface and check it for instability.

Weather Forecast

A Northern flow continues to keep cold arctic air in our region for the next few days. Expect high overcast and light flurries with clearing skies mid-week. No significant snow accumulations are expected through the middle of the week.

Danger Ratings Explained

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.

Natural avalanches possible; human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

4 - High

Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.

Natural avalanches likely; human-triggered avalanches very likely.

Large avalanches in many areas; or very large avalanches in specific areas.

5 - Extreme

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

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