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Avalanche Forecast - South Coast - Inland    


Date Issued   Tuesday, 27 March 2012 5:10 PM      Valid Until    Wednesday, 28 March 2012 4:00 PM
Danger Rating: Wednesday 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.
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Thursday Friday
Alpine 4 - High 3 - Considerable
Treeline 3 - Considerable 3 - Considerable
Below Treeline 3 - Considerable 3 - Considerable
Confidence: Fair - Intensity of incoming weather is uncertain
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 windslabs will form with the new snow and increased wind. Some interesting thin slabs that formed from downflowing wind associated with the warm weekend are now lightly buried.
Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Give cornices a wide berth when travelling on or below ridges.
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
Cornices
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Large cornices loom at ridgecrest and will grow under the current conditions. They may act as a large trigger to deeper weaknesses.
Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Give cornices a wide berth when travelling on or below ridges.
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
Deep Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Persistent weaknesses, buried in February, still have the potential to create very large, destructive avalanches if triggered. Possible triggering mechanisms include a person/sled on a thin snowpack spot, cornice fall, or step-down avalanche.
Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Give cornices a wide berth when travelling on or below ridges.
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.

Prepared by mpeter