Date issued

Mar 31, 2018 - 3:00 PM

Valid until

Apr 1, 2018 - 2:00 PM

Prepared by

jeremy.mackenzie

Some good winter skiing out there, but watch for surface and near surface wind slabs that are sensitive to human triggering.

Regular season
Sunday - April 1, 2018
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.

Monday - April 2, 2018
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.

Tuesday - April 3, 2018
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?

The recent storm has formed wind slabs near ridge-crests at Treeline and more widespread in the Alpine. Variable wind directions have deposited these slabs on all but westerly aspects. Human triggering is likely.

Travel and Terrain Advice
  • Avoid steep lee and cross-loaded slopes
  • Evaluate unsupported slopes critically.
  • Avoid freshly wind loaded features.

Avalanche Problem 2: Persistent Slabs

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

This layer's depth varies based on aspect. In lee areas, it could be 40-60 deep.

Travel and Terrain Advice
  • Avoid steep Southerly aspects.

Avalanche Summary

Several loose dry avalanches up to size 2.0 were observed in steep terrain in the Alpine and at Treeline. A few thin slabs up to size 2.0 occurred in steep Alpine terrain on W and E aspects.

Snowpack Summary

Up to 25cm recent storm snow at Treeline. In the early stage of the storm the winds were strong from the NW switching to SW. This has formed surface and near surface wind slabs in the Alpine. Cornices have grown. At the tail end of the storm the winds tapered off and at Treeline and below there is little to no wind effect in the surface snow. A series of sun crusts are buried on solar aspects, but generally seem unreactive, however the Mar 15 crust down up to 30cm is still being monitored.

Weather Forecast

Sunday will bring flurries to the region with accumulations near 10cm by end of day on Sunday. Alpine temperatures should reach a high -7 °C, with light easterly winds. Early next week will see a return to the unseasonably cold temperatures and some light intermittent flurries. Spring seems a long way off!!!

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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