Date issued

Jan 16, 2018 - 3:00 PM

Valid until

Jan 17, 2018 - 2:00 PM

Prepared by

michael.olsthoorn

Good skiing was found in sheltered areas.  We are in for a change.  Strong winds are expected until Thursday, thus creating wind slabs into tree line.  Snow on the way starting Wednesday night.

Regular season
Wednesday - January 17, 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 - January 18, 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 - January 19, 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?

Strong winds are expected to continue until Thursday.  Expect wind slab development to continue.  We will probably start to see wind slabs at tree line.

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

Avalanche Problem 2: Persistent Slabs

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

  This layer is very prominent at treeline and more variable in the alpine. This layer is 50-70cm down. Take the time to dig and assess this layer as it is sitting on top of facets.

Travel and Terrain Advice
  • Dig down to find and test weak layers before committing to a line.
  • Avoid open slopes and convex rolls at treeline where buried surface hoar may be preserved.
  • Evaluate unsupported slopes critically.

Avalanche Summary

No new observed.

Snowpack Summary

Surface hoar is continuing to grow on the surface and could become an issue if Thursday snowfall is of great amounts. Some wind effect at tree line was observed.  Jan 6 SH layer is mostly found below 2200m and not much of a concern because of the lack of a slab.  The Dec 15 layer is variable in the alpine and more prominent at treeline.  The November crusts are starting to show some breakdown with more facets around the crust.

Weather Forecast

Wednesday is suppose to bring cloudy skies with isolated flurries.  55-80km/h SW winds are expected to start Tuesday night and continue through to Thursday.  Temperatures in the alpine for Wednesday should reach -4c.  Periods of snow are expected for Thursday.

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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