featured sponsor

forecast sponsor

Avalanche Forecast - Purcells    


Date Issued   Sunday, 25 March 2012 6:12 PM      Valid Until    Monday, 26 March 2012 4:00 PM
 

There is a possibility of higher than forecast freezing levels combined with precipitation that might be rain. If it is raining above 1500 metres in your area, then the danger ratings may be closer to HIGH.

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 4 - High
Treeline 3 - Considerable 3 - Considerable
Below Treeline 3 - Considerable 3 - Considerable
Confidence: Fair - Timing, track, or intensity of incoming weather is uncertain on Monday
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.

Deep Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Very large avalanches have been failing on a weak layer up to 2 m deep with alarming ease. This problem demands respect. Choose very conservative terrain, as the consequences of triggering this layer could be huge.
Travel and Terrain Advice
  • Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.
  • Choose regroup spots that are out of avalanche terrain.
  • Extra caution needed around cornices with current conditions.
Cornices
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Large cornices are looming above many slopes. These may weaken with fluctuating temperatures and could act as a trigger for a very large avalanche. Variable wind slabs can also be found behind ridges and terrain breaks.
Travel and Terrain Advice
  • Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.
  • Choose regroup spots that are out of avalanche terrain.
  • Extra caution needed around cornices with current conditions.
Loose Wet
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Previous solar warming may not get a chance to recover overnight. Forecast rain up to about 1400 metres may weaken the snowpack. Loose wet releases at treeline may step down to the deeply buried weak layer.
Travel and Terrain Advice
  • Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.
  • Choose regroup spots that are out of avalanche terrain.
  • Extra caution needed around cornices with current conditions.

Prepared by triley