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Avalanche Forecast - South Coast - Inland    


Date Issued   Wednesday, 07 March 2012 6:01 PM      Valid Until    Thursday, 08 March 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.
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
Friday Saturday
Alpine 4 - High 4 - High
Treeline 4 - High 4 - High
Below Treeline 3 - Considerable 3 - Considerable
Confidence: Fair - Timing, track, or intensity of incoming weather is uncertain for the entire period
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.

Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Continued diligence and conservative decisions are necessary. The potential for cornice triggers, remote triggering, step down avalanches, and wide propagations makes this problem particularly tricky to manage.
Travel and Terrain Advice
  • Avoid freshly wind loaded features.
  • Avoid steep Southerly aspects.
  • Plan to be off big slopes before the temperatures rises and the snowpack deteriorates.
  • Cornices become weak with daytime heating, so travel early on exposed slopes.
  • Whumpfing, shooting cracks and recent avalanches are all strong indicators of an unstable snowpack.
Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Recent variable winds have deposited fresh wind slabs in unusual places, but generally lurking below ridgecrests, behind terrain features and in gullies. Cornices are expected to weaken with warm temperatures and could trigger large wind slabs below.
Travel and Terrain Advice
  • Avoid freshly wind loaded features.
  • Avoid steep Southerly aspects.
  • Plan to be off big slopes before the temperatures rises and the snowpack deteriorates.
  • Cornices become weak with daytime heating, so travel early on exposed slopes.
  • Whumpfing, shooting cracks and recent avalanches are all strong indicators of an unstable snowpack.
Storm Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Touchy weaknesses within and under the recent storm snow are expected to become more reactive with warm temperatures and sun-exposure. Cohesionless low-density snow overlying a crust can produce large loose-snow avalanches.
Travel and Terrain Advice
  • Avoid freshly wind loaded features.
  • Avoid steep Southerly aspects.
  • Plan to be off big slopes before the temperatures rises and the snowpack deteriorates.
  • Cornices become weak with daytime heating, so travel early on exposed slopes.
  • Whumpfing, shooting cracks and recent avalanches are all strong indicators of an unstable snowpack.

Prepared by ccampbell