Date issued

Dec 17, 2017 - 3:00 PM

Valid until

Dec 18, 2017 - 2:00 PM

Prepared by

jeremy.mackenzie

Snow and wind are on the way. Be prepared for an increase in avalanche danger.

Regular season
Monday - December 18, 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 19, 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 20, 2017
Alpine

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.

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: Wind Slabs

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

Fresh wind slabs will develop overnight with the expected snowfall and moderate westerly winds. Look for these on lee and cross-loaded features at Treeline and above.

Travel and Terrain Advice
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Caution in lee and cross-loaded terrain near ridge crests.

Avalanche Problem 2: Loose Dry

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

New snow will sluff easily in steeper terrain at higher elevations as well as below 2150m where the weak layer of large surface hoar crystals exists.

Travel and Terrain Advice
  • Be cautious of sluffing in steep terrain.
  • Avoid travelling on ledges and cliffs where sluffing may have severe consequences.

Avalanche Problem 3: Persistent Slabs

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

This layer is widespread in terms of its location in the terrain. The new snow load will not likely be enough to activate this layer yet, but be cautious of thin areas where triggering may be more possible.

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

Avalanche Summary

No new avalanches have been observed or reported for at least 1 week.

Snowpack Summary

Another windy day on Sunday, but this has led to little change in the snowpack. The winds, temperatures and lack of snow have left a variety of surface layers- none of which are conducive to good skiing. Valley bottom has decomposing surface hoar that is covered with a dusting of snow from the past 48 hours. Treeline is a widespread wind slab surface covering the crusts from late november. The alpine is also severely wind affected and on any windward aspect its blown to gravel or the old crusts. In general, there is not much out there for avalanche problems at the moment.

Weather Forecast

Sunday night could see 10 to15cm of new snow with moderate westerly winds. Monday will be cloudy with sunny periods and isolated flurries. Alpine temperature will reach a high of -11 °C. with continued moderate westerly winds. A further 15 to 20cm of snow is forecast for Tuesday.

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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