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Avalanche Forecast - Lizard Range    


Date Issued   Wednesday, 04 January 2012 5:15 PM      Valid Until    Thursday, 05 January 2012 4:00 PM
Danger Rating: Thursday 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.
Friday Saturday
Alpine 3 - Considerable 2 - Moderate
Treeline 2 - Moderate 2 - Moderate
Below Treeline 2 - Moderate 1 - Low
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.

Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
New wind slabs are forming on North through East aspects. Watch out for cross/reverse loading in open areas due to some local wind variability. New cornice growth may be weak and break off easily, triggering the slope below.
Travel and Terrain Advice
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
  • Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.
  • Be cautious as you transition into wind affected terrain.
  • Use ridges or ribs to avoid pockets of wind loaded snow.
  • Give cornices a wide berth when travelling on or below ridges.
Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
The recent storm snow has combined into a cohesive slab above several weak surface hoar and surface facet layers. The most re-active layer is the mid-december surface hoar that is buried up to 100cms down. Large avalanches are easy to trigger.
Travel and Terrain Advice
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
  • Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.
  • Be cautious as you transition into wind affected terrain.
  • Use ridges or ribs to avoid pockets of wind loaded snow.
  • Give cornices a wide berth when travelling on or below ridges.
Cornices
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Cornices may become weak with warm alpine temperatures. The load on the slope below could trigger a large-very large avalanche if it steps down to the weak mid-December surface hoar layer.
Travel and Terrain Advice
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
  • Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.
  • Be cautious as you transition into wind affected terrain.
  • Use ridges or ribs to avoid pockets of wind loaded snow.
  • Give cornices a wide berth when travelling on or below ridges.

Prepared by swerner