Date issued

Feb 25, 2018 - 3:00 PM

Valid until

Feb 26, 2018 - 2:00 PM

Prepared by

michael.olsthoorn

Good skiing can be found in sheltered areas.  Wind slabs cover the alpine.

Regular season
Monday - February 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 - February 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.

Wednesday - February 28, 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?

Facetting is helping ease this problem at treeline. The alpine on the other hand is still covered in windslabs of varying densities.

Travel and Terrain Advice
  • Evaluate unsupported slopes critically.
  • Use caution in lee areas. Recent wind loading has created wind slabs.

Avalanche Problem 2: Deep Persistent Slabs

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

Large triggers are a concern. It's safe to say we're in the "low probability/high consequence" situation.  Avoid thin areas.

Travel and Terrain Advice
  • Be aware of the potential for full depth avalanches due to deeply buried weak layers.

Avalanche Summary

One large and long audible sound (probably an avalanche) was heard in the Mt. Murray/Murray Creek area. The weather was not conducive to get a visual on anything.

Snowpack Summary

Below treeline has really felt the cold. Any area that was loose snow prior to the cold is now weak and facetted. This isn't a bad thing, many windslabs have lost their cohesiveness thanks to that cold snap.

At treeline the wind slabs are immediately noticeable once exposed terrain is reached. For the most part these slabs are thin and sometimes breakable. Steep, unsupported terrain may have reactive windslabs lurking, but for the most part the slabs are well bonded to underlying layers.

The alpine has windslabs that are widespread and either breakable or eerily hollow under foot. These feel as though they could be triggered from shallow, transitional areas.

Weather Forecast

Tonight will be clear, with temps dipping to -17c and moderate ridge top winds. Tomorrow the forecast indicates a mix of sun and cloud with isolated flurries. Winds will be 40-55km/h from the west and a high of -16c in the alpine.

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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