Date issued

Dec 8, 2017 - 3:00 PM

Valid until

Dec 9, 2017 - 2:00 PM

Prepared by

KESAdmin

Cooler temperatures are incoming this weekend but check wx stations for a possible inversion in the morning.  Wind and warm temps have made good skiing challenging to find.  MK

Regular season
Saturday - December 9, 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

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.

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 - December 10, 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

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.

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.

Monday - December 11, 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

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.

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?

Watch for pockets of hard slabs along ridgelines and in gullied terrain. In some areas these slabs may be large and have the ability to propagate across a feature.

Travel and Terrain Advice
  • Avoid lee and cross-loaded terrain near ridge crests.
  • Watch for clues, like sluffing off of cliffs, that the snowpack is warming up.

Avalanche Problem 2: Persistent Slabs

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

Only isolated avalanches on this layer over the past few days.  Use caution in thinner areas where you may be able to wake up this layer. 

Travel and Terrain Advice
  • Be cautious in shallow snowpack areas where triggering is more likely.

Avalanche Summary

Some pinwheeling due to moist snow was observed out of steep solar aspects later in the day. Otherwise no new avalanches were observed.

Snowpack Summary

Wind slabs are most noticeable near ridgeline and extending down the slope on most aspects due to the recent winds. Today was warm and sunny, thus making the snow moist on solar aspects and turning into a crust once the sun went away. The November crusts are still a concern, mostly in shallow areas.  Surface hoar is developing in lower elevations.  This will be yet another layer to pay attention to.

Weather Forecast

Well overnight on Friday cooler temperatures should begin to move into the forecast region and we should see a new crust form again on the solar aspects!  The omega block weather pattern is holding firm and arent likely to see any new snow over the next while.

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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