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Avalanche Bulletin - Kootenay Boundary    


Date Issued   Saturday, 31 December 2011 5:28 PM      Valid Until    Sunday, 01 January 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 3 - Considerable 3 - Considerable
Below Treeline 3 - Considerable 3 - Considerable
Confidence: Fair - Forecast snowfall amounts are uncertain on Tuesday
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?
New snow has increased the slab depth to 60-80 cm above the weak surface hoar layer. Natural avalanches and light triggers have resulted in wide propagations and large destructive avalanches.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Avoid freshly wind loaded features.
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
  • Extra caution needed around cornices with current conditions.
Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Be alert for wind slabs below ridge crests, behind terrain features, and in cross-loaded gullies. New cornices may be weakly bonded and likely to break off.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Avoid freshly wind loaded features.
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
  • Extra caution needed around cornices with current conditions.

Prepared by triley