Date issued

Mar 19, 2018 - 3:00 PM

Valid until

Mar 20, 2018 - 2:00 PM

Prepared by

jeremy.mackenzie

Temperatures are expected to be cool, but avalanche hazard will rise on sunny slopes during even short exposure to the intense March sun. Look to sheltered northerly aspects for better quality skiing.

Regular season
Tuesday - March 20, 2018
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.

Wednesday - March 21, 2018
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.

Thursday - March 22, 2018
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: Wind Slabs

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

Wind slabs should be expected in alpine terrain along ridgelines and in gully features. These slabs do not appear to extend far downslope.

Travel and Terrain Advice
  • Give cornices a wide berth when traveling on ridges.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Avalanche Problem 2: Loose Dry

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

The loose dry problem should moderate somewhat by Tuesday, but any time there is intense solar radiation watch for loose wet avalanches out of solar aspects.

Travel and Terrain Advice
  • Be cautious of sluffing in steep terrain.

Avalanche Summary

Several loose dry avalanches up to size 1.5 in steep Alpine terrain on all aspects.

Snowpack Summary

New snow amounts are highly variable depending on drainage and elevation, with some areas receiving as much as 20cm of low density in the past 24 hours. This new snow sluffs easily in steep terrain in the Alpine on all aspects, and is running further on aspects that have a buried crust under the recent snow. Multiple buried sun or melt-freeze crusts now exist on most aspects with only sheltered northerly aspects escaping this condition. Variable wind slab conditions in upper Alpine on lee and cross-loaded features, but slab avalanche activity has tapered off in the past 48hrs.

Weather Forecast

Weather models are in poor agreement, but it is most likely that Tuesday  will be mostly cloudy with a few sunny periods and occasional flurries. Alpine temperatures will climb to near -7 °C, with ridge-top winds out of the west at 20km/h. Freezing levels is forecast to reach 1800m. Wednesday and Thursday look to be very similar in terms of weather.

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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