Date issued

Dec 5, 2017 - 3:00 PM

Valid until

Dec 6, 2017 - 2:00 PM

Prepared by

michael.olsthoorn

Another day of good skiing.  Wind effect has started to show up near ridge line.  Careful evaluation is recommended here and for cross loaded feature.

Regular season
Wednesday - December 6, 2017
Alpine

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.

Treeline

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.

Below 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.

Thursday - December 7, 2017
Alpine

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.

Treeline

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.

Below 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.

Friday - December 8, 2017
Alpine

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.

Treeline

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.

Below 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.

Avalanche Problem 1: Persistent Slabs

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

Remember, in shallow areas it is still possible to trigger the deeper layers and wake up the weak facets around the October crusts.

Travel and Terrain Advice
  • Be cautious in shallow snowpack areas where triggering is more likely.

Avalanche Problem 2: Wind Slabs

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

Recent NW winds have created slabs 30-50cm deep are being encountered in the Alpine on S and E aspects. Be cautious near ridgeline for wind loading, especially on lee features.

Travel and Terrain Advice
  • Avoid lee and cross-loaded terrain near ridge crests.
  • Use caution in lee areas. Recent wind loading has created wind slabs.

Avalanche Summary

A few loose dry avalanches up to size 2 mostly on E to SE aspects, most likely from the recent NW winds.

Snowpack Summary

The recent NW winds have started to create windslabs on lee features and extent down the slope. Some wind pressed snow was observed on the windward aspects. Evidence of moderate wind loading was observed on cross loaded features in the alpine. The November crust layers are buried between 50 and 70cm. The basal layers of the snowpack are made up of a mix of crusts from October along with facets. These layers continue to show moderate to hard results in snowpack stability tests. The upper snowpack will change and become denser when the warm weather rolls in creating a slab on top of the November raincrust.

Weather Forecast

The forecast for Wednesday will bring an Alpine temperature of 1c and a freezing level of 1800m.  Winds will continue from the northwest 25-35km/h.  Thursday and Friday will bring sunny skies with the freezing levels rising to 2800m along with NW winds around 30km/h.

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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