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Avalanche Forecast - Northwest Coastal    


Date Issued   Friday, 06 January 2012 5:43 PM      Valid Until    Saturday, 07 January 2012 4:00 PM

A significant storm this weekend will result in another major avalanche cycle.

Danger Rating: Saturday Alpine Treeline Below Treeline
4 - High Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
4 - High Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Sunday Monday
Alpine 5 - Extreme 4 - High
Treeline 4 - High 3 - Considerable
Below Treeline 3 - Considerable 2 - Moderate
Confidence: Good - -1
Learn more about danger ratings
Low Moderate Considerable High Extreme

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.

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.

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.

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.

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

Storm Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Large amounts of new snow with warming temperatures will create very touchy storm slab conditions.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Stick to simple terrain and be aware of what is above you at all times.
  • Be aware of the potential for wide propagations due to the presence of hard windslabs.
  • Choose conservative lines and watch for clues of instability.
Wet Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Rain expected to fall as high as 2000 m will release wet slab avalanches on steep, open slopes.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Stick to simple terrain and be aware of what is above you at all times.
  • Be aware of the potential for wide propagations due to the presence of hard windslabs.
  • Choose conservative lines and watch for clues of instability.
Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Extreme winds have set up touchy wind slabs that should be treated with the utmost respect.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Stick to simple terrain and be aware of what is above you at all times.
  • Be aware of the potential for wide propagations due to the presence of hard windslabs.
  • Choose conservative lines and watch for clues of instability.

Prepared by jfloyer