Date issued

Nov 23, 2017 - 3:00 PM

Valid until

Nov 24, 2017 - 2:00 PM

Prepared by

KESAdmin

Cooler temps will move back into the forecast area overnight.  Watch for new thin wind slabs in alpine areas.  Rugged travel anywhere below 2500m.

Regular season
Friday - November 24, 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.

Saturday - November 25, 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.

Sunday - November 26, 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: Persistent Slabs

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

Wind slabs are now beginning to fail down 30-50cm on the Halloween crust. in some areas they are stepping down to the october 17th crust.  Gullies and pockets along ridgelines are best avoided.

Travel and Terrain Advice
  • Be aware of the potential for wide propagations due to the presence of hard windslabs.

Avalanche Problem 2: Wind Slabs

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

Thin new wind slabs will build in Alpine terrain overnight and throughout Friday.

Travel and Terrain Advice
  • Avoid freshly wind loaded features.

Avalanche Summary

Evidence of a few paths going sz 2 - 2.5 over the past 24hrs.  Most of the debris was stopping at the middle or bottom of the tracks of the slide paths.

Snowpack Summary

Freezing levels were around 2600m on Wednesday evening and finally began dropping late thursday afternoon.  So far lower elevations have seen a large decrease in snowpack depths due to warm temps and rainfall while treeline depth are still around 1m.  The recent rapid loading caused a natural avalanche cycle with many paths going sz 2-2.5 failing on either the Halloween crust or the Oct 17th melt freeze crust.  As this layer freezes overnight we will now start to have a new layer in the snowpack.  The November rain crust.  Conditions will tighten up with teh cooling overnight but it will take  afew days for teh cooler temps to penetrate the snowpack.

Weather Forecast

Snowfalls will begin to taper overnight and freezing levels will drop to the valley bottom.  We should see some recovery in the snowpack overnight but it will take a few days for the cool temps to fully penetrate the snowpack.  Winds will be SW on Friday with Alpine temps of -10C.

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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