Date issued

Dec 3, 2017 - 3:31 PM

Valid until

Dec 4, 2017 - 2:00 PM

Prepared by

mike.koppang

The winds have yet to arrive which seems so rare!  Watch for pockets of skier triggerable wind slabs along ridgelines, mainly on N and E aspects.  Good skiing in sheltered areas!

Regular season
Monday - December 4, 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.

Tuesday - December 5, 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.

Wednesday - December 6, 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?

Recent windslabs 30-50cm deep are being encountered in Alpine on N and E aspects.  These slabs do not extend far downslope but are definetly at the entrances to runs so use caution. 

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

Avalanche Problem 2: Persistent Slabs

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

Remember, in shallow areas it is still possible to trigger the deeper layers and wake up the weak facets around the october crust

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

Avalanche Summary

A few sz 2 avalanches were observed in steep E facing alpine terrain failing 30-50cm deep. Some may have been triggerred by loose sluffing from above. One noteable sz 2.5 avalanche was seen on the E face of Snow Peak that may have been triggerred by a cornice collapse and occurred within the past 24-48hrs. The depth on this slide was estimated to be at least 50cm deep, 100m wide and ran an unknown distance.

Snowpack Summary

A few additional cm of new snow overnight and generally light winds except above 2900m where some snow transport was observed. So far the upper snowpack is continuing to settle and we are not seeing any results on the Nov CRs. A weak layer of facetted crystals is being observed below the Halloween crust that is continuing to produce moderate to hard results deeper in the snowpack. In alpine terrain you should expect to encounter pocket of windslabs 30-50cm thick along ridgelines, below cliff faces and along cross loaded slopes. Use caution in these areas.

Weather Forecast

A mix of sun and cloud is expected on Monday.  Precipitation: Nil.  Alpine temperature: High -9 C.  Ridge wind west: 30 km/h.  Freezing level at valley bottom.

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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