Date issued

Mar 24, 2018 - 3:00 PM

Valid until

Mar 25, 2018 - 2:00 PM

Prepared by

mike.koppang

The recent snow is hiding the windslabs that formed earlier in the week.  We are not into spring stability right now!  Best skiing will be on sheltered N aspects.

Regular season
Sunday - March 25, 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 - March 26, 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

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 - March 27, 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

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?

Windslabs in alpine areas along ridgelines and crossloaded features. Watch for these at the entrances to runs.

Travel and Terrain Advice
  • Use caution in lee areas. Recent wind loading have created wind slabs.
  • Avoid freshly wind loaded features.

Avalanche Problem 2: Cornices

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

Overhead cornices loom along ridgelines. As daytime temps warm up, these will become weak and have potential to collapse.

Travel and Terrain Advice
  • Cornices become weak with daytime heating, so travel early on exposed slopes.
  • Pay attention to overhead hazards like cornices which could easily trigger deep slabs.

Avalanche Summary

Over the past 36hrs there have been a few sz 2 slides out of N and E aspects in alpine areas.  There are mainly failing down 20-30cm and 30-50m wide. 

Snowpack Summary

5-10cm new snow fell across the region overnight with very little wind affect.  This new snow now blankets the previous windslabs that formed earlier in the week.  These windslabs are easy to find in alpine terrain and are 20-40cm thick.  What natural avalanche activity we did see on Friday showed these windslabs failing mainly on N and E aspects in steeper terrain or in unsupported features.  Field test were showing an easy to moderate sheer at the interface of the windslabs with the underlying snow.  Be heads up in steeper areas  and choose supported terrain. Light snow was starting as we left.  The best skiing will be on N aspects due to crusts on solar aspects.

Weather Forecast

A mix of sun and cloud.

Precipitation: Nil.

Alpine temperature: High -11 °C.

Ridge wind west: 30-50 km/h.

Freezing level at valley bottom.

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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