Date issued

Nov 28, 2017 - 3:00 PM

Valid until

Nov 29, 2017 - 2:00 PM

Prepared by

matt.mueller

Our snowpack seems to get more and more complex as each day passes. Its a good idea to dig and familiarize yourself with conditions before venturing into avalanche terrain.

Regular season
Wednesday - November 29, 2017
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 - November 30, 2017
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 - December 1, 2017
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?

Expect windslab development in lee and cross loaded gullies.

Travel and Terrain Advice
  • Use caution in lee areas. Recent wind loading has created wind slabs.
  • Avoid freshly wind loaded features.
  • Watch for areas of hard wind slab in steep alpine features.

Avalanche Problem 2: Persistent Slabs

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

The new crusts are preventing the deeper layers from disturbance. Remember, in shallow areas it is still possible to trigger the deeper layers.

Travel and Terrain Advice
  • Be aware of the potential for wide propagations.
  • Be cautious in shallow snowpack areas where triggering is more likely.

Avalanche Summary

Nothing new today.

Snowpack Summary

Snow profiles in the Highwood area today offered a good glimpse of our current snowpack. At treeline, snow depth is anywhere from 60-100cm deep. The surface snow character is dependant on wind exposure. Some areas are a softer slab, while others are quite hard (kicking to get a ski edge in) and often hollow sounding. The recent rain crusts (Nov 26 & Nov 23) are down 40cm on average and are 2 distinct layers. These 2 crusts are very obvious and well bonded for the time being. We'll have our hands full when that changes...The Oct 31crust is breaking down and variable in its character. Some places it is intact and others it has broken down/compressed and become part of the "base" snowpack. In both instances, it is still considered a weak layer and failing in tests after moderate loads. In the alpine it is very similar, but the depths are proportionally deeper. The surface wind slabs are concerning as they are failing under lighter loads (CT easy SC). Windloading in ongoing, so expect these numbers to change rapidly if the wind continues.

Weather Forecast

Winds will continue overnight and tomorrow. They will be westerly and about 65km/hr at ridge top. Only a few flurries are expected with no real accumulation. Temperatures will hover around -12 degrees.

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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