Date issued

Feb 4, 2018 - 3:00 PM

Valid until

Feb 5, 2018 - 2:00 PM

Prepared by

michael.olsthoorn

Lots of new snow and good skiing.  Tread carefully as the snowpack is complex and  human triggered avalanches are still likely in many areas.

Regular season
Monday - February 5, 2018
Alpine

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.

Treeline

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.

Below Treeline

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.

Tuesday - February 6, 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

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.

Below Treeline

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.

Wednesday - February 7, 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

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.

Below Treeline

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.

Avalanche Problem 1: Loose Dry

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

Ice climbers, avoid gullies.  Expect sluffing in steeper terrain.

Travel and Terrain Advice
  • Sluffs may trigger deeper instabilities.
  • Avoid areas with overhead hazard.

Avalanche Problem 2: Wind Slabs

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

Wind slabs are extensive in the alpine down to tree line. These may also step to deeper layers.

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

Avalanche Problem 3: Persistent Slabs

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

These are deeply buried (One meter +).  Be sure to assess them thoroughly.  These can be triggered by loose dry or the wind slabs.

Travel and Terrain Advice
  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
  • Avoid convex rolls at and below treeline where buried surface hoar may be preserved.
  • Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

Avalanche Summary

Some loose dry avalanches were noticed starting from the alpine in unskiable terrain.  One size 2.5 slab avalanche was noticed in the French creek area on a SE aspect at 2500m.

Snowpack Summary

There is about 40cm of snow from this most recent storm.  In the alpine and tree line, this storm snow is reactive to skier traffic as a slab on lee features.  In the Commonwealth area, the Jan. 6th surface hoar was found at 2350m was about 100cm down from the top.  This layer produced variable results from easy to hard but was very planar in nature. Some reverse loading from recent North winds was noticed; which means that some of the south aspects have more snow than usual.

Weather Forecast

Monday is suppose to bring a mix of sun and cloud with an alpine temperature of -13c.  Winds are expected to be light from the West.  More snow is forecast for the latter part of the week.

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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