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Date issued

Mar 25, 2018 - 3:00 PM

Valid until

Mar 26, 2018 - 2:00 PM

Prepared by

mike.koppang

Winds are forecast to increase in the coming days so watch for the windslabs in alpine terrain to become more reactive and widespread.  A spring snowpack is still a ways off.

Regular season
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

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.

Wednesday - March 28, 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?

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

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

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

Avalanche Summary

Loose dry sluffing up to sz 1 was observed from steeper alpine areas.  No new slab activity was observed.

Snowpack Summary

10-20cm of snow has fallen over the past 48hrs with NW winds at higher elevations creating new thin windslabs as well as burying the previous ones.  These windslabs are easy to find in alpine terrain and are 20-40cm thick. What natural avalanche activity we did see on before the weekend 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.  The best skiing will be on N aspects due to crusts on solar aspects. Despite cooler temperatures, when the sun does come out it has lots of punch so be thinking about the affects of solar radiation later in the day.

Weather Forecast

A mix of sun and cloud is forecast for monday with light isolated flurries.  The winds are supposed to ramp up on tuesday into the strong range so we expect the ski quality in alpine areas to diminsh over the coming days....Temps will be below average with daytime highs are -5C

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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