Date issued

Dec 4, 2017 - 3:27 PM

Valid until

Dec 5, 2017 - 2:00 PM

Prepared by

jeremy.mackenzie

The skiing is good right now, but be diligent when evaluating the avalanche problems. Increased northerly winds on Tuesday will create additional wind slabs.

Regular season
Monday - December 4, 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.

Tuesday - December 5, 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.

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

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

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.
  • Be aware of the potential for wide propagations.

Avalanche Problem 2: Wind Slabs

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

Recent wind slabs 30-50cm deep are being encountered in the Alpine on N and E aspects. These slabs do not yet extend far down-slope, but be cautious near ridge-crest. The strong northerly flow will add southerly aspects to the problem area tomorrow.

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

Avalanche Summary

A few slab avalanches up to size 2.5 were observed yesterday on steep N and E aspects in the Alpine. No new avalanches were observed today.

Snowpack Summary

Pockets of wind slab ranging from 30 to 50cm thick are present in Alpine areas in lee and cross-loaded features. At the moment these slabs do not extend far down-slope, but this will change as winds increase. The November crust layers are buried between 50 and 70cm at Treeline and do not appear particularly active, but are certainly worth keeping an eye on. The basal layers of the snowpack are made up of a mix of crusts from October and facets. These layers continue to show moderate to hard results in snowpack stability tests.

Weather Forecast

A ridge of high pressure is building over the region bringing a cool northerly flow. Tuesday in Kananaskis will be a mix of sun and cloud with a high of -6 C. Ridge-top winds will be from the NW at 30-50 km/h. There is no precipitation in the forecast for at least the next 5 days.

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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