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Avalanche Forecast - Northwest Coastal    


Date Issued   Saturday, 03 March 2012 5:57 PM      Valid Until    Sunday, 04 March 2012 4:00 PM
Danger Rating: Sunday Alpine Treeline Below Treeline
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
Monday Tuesday
Alpine 3 - Considerable 4 - High
Treeline 2 - Moderate 4 - High
Below Treeline 2 - Moderate 3 - Considerable
Confidence: Fair - Forecast snowfall amounts are uncertain on Sunday
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.

Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
New snow and strong westerly winds are developing new windslabs that may fail naturally or be easy to trigger with light additional loads.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.
  • Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Make observations and assess conditions continually as you travel.
  • Stay off recent wind loaded areas until the slope has had a chance to stabilize.
Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
The new storm is expected to add a new load above the persistent weak layer of facets, surface hoar and crusts that are buried down about 70 cm. Avalanches that start in the storm snow may step down and cause large destructive avalanches.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.
  • Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Make observations and assess conditions continually as you travel.
  • Stay off recent wind loaded areas until the slope has had a chance to stabilize.

Prepared by triley