Date issued

Nov 9, 2017 - 4:00 PM

Valid until

until further notice

Prepared by

Garth Lemke

Early season conditions exist with low snow cover and hidden hazards just lurking beneath the surface. 

Regular season
Friday - November 10, 2017
Alpine

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.

Treeline

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.

Below Treeline
Saturday - November 11, 2017
Alpine

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.

Treeline

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.

Below Treeline
Sunday - November 12, 2017
Alpine

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.

Treeline

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.

Below Treeline

Avalanche Problem 1: Wind Slabs

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

This is an 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.
  • Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.

Avalanche Problem 2: Loose Dry

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

Avoid terrain traps or steep SW overhead terrain where sun, if it comes out, could initiate an avalanche. Likely a short lived afternoon problem being days are short and sun is relatively weak.

Travel and Terrain Advice
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Avalanche Summary

No Patrol Thursday. It is not uncommon at this time of year for climbers to trigger small avalanches from gully features. Even small rides over rocky terrain, cliffs, or terrain traps can have serious consequences. Wednesday's patrol to Maligne observed several solar induced loose and windslab avalanches on Steep S aspects up to size 2.

Snowpack Summary

Field data is limited. Below 1700m there is no significant snow. At 2000m and above 30cm plus can be expected with deeper wind pockets. Snow distribution will vary greatly with aspect, elevation, and wind exposure. Treeline and alpine gully features plus some lee alpine slopes will be wind loaded. Ground features are marginally covered.

Weather Forecast

1-3cm of snow is forecast for the next 48 hours. Temperatures will hover -6 to -11 with light westerly winds. Some sun may break through on Saturday but expect overall cloudy conditions. Little change expected through the weekend.

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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