featured sponsor

related incidents

forecast sponsor

Avalanche Forecast - South Columbia    


Date Issued   Sunday, 29 January 2012 5:47 PM      Valid Until    Monday, 30 January 2012 4:00 PM
Danger Rating: Monday 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.
Tuesday Wednesday
Alpine 3 - Considerable 3 - Considerable
Treeline 3 - Considerable 2 - Moderate
Below Treeline 2 - Moderate 2 - Moderate
Confidence: Fair - Timing, track, or intensity of incoming weather is uncertain on Wednesday
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?
Wind slabs 50 - 100 cm in depth are possible as strong winds accompanied the weekend storm. With this much loading I'd give wind exposed terrain a miss Monday as it will need another day to adjust to the new load.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Choose conservative lines and watch for clues of instability.
  • Make observations and assess conditions continually as you travel.
  • Extra caution needed around cornices with current conditions.
Storm Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
The weekend storm came in cold, then went warm creating an upside down structure. I expect another 20 - 30 of moist snow before skies clear Tuesday. You're most likely to trigger a storm slab in steep and/or unsupported/convex terrain Monday.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Choose conservative lines and watch for clues of instability.
  • Make observations and assess conditions continually as you travel.
  • Extra caution needed around cornices with current conditions.
Cornices
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Big winds have created large cornices. Give these behemoths a wide berth whether traveling near them or far below them. Failing cornices have the potential to trigger large avalanches.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Choose conservative lines and watch for clues of instability.
  • Make observations and assess conditions continually as you travel.
  • Extra caution needed around cornices with current conditions.

Prepared by ghelgeson