Date issued

Mar 27, 2018 - 3:00 PM

Valid until

Mar 28, 2018 - 2:00 PM

Prepared by

matt.mueller

So far our spring is slow to develop. Our spring-like snowpack of last week has gone back to being more of a winter snowpack. Keep the "winter radar" on for the next while. 

Regular season
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.

Thursday - March 29, 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.

Friday - March 30, 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?

Extensive wind slab development has occurred in the Alpine and in lee and cross-loaded features at Treeline. Expect some natural avalanche activity in steep terrain and be aware that human-triggering is likely in recently wind loaded features.

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

Avalanche Summary

Nothing new today, but field observations were very limited. The weather pattern suggests that the isolated activity noted yesterday probably continued into today.

Snowpack Summary

Wind and flurries continue to join forces and create new windslabs in the alpine and exposed treeline terrain. These slabs have been building for the past few days and are getting thicker, more widespread and more sensitive. Natural activity indicates the slabs are up to 70cm thick in wind prone areas. The slabs rest on a variety of surfaces, most of which are aspect or elevation dependant. The march 15 crust is the most concerning buried layer. It is widespread on any solar aspect. The other problematic buried layers are the interfaces between the windslabs themselves. Typically these "heal" up quickly, but we're finding that once one "heals" and goes away, it is replaced with another shallower one.

Weather Forecast

Isolated flurries tonight with winds gusting to 55km/hr (westerly). Alpine low of -12. Tomorrow will see -11 as the high and winds continuing to blow from the west at 25-40km/hr. No snow is expected tomorrow.

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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