[AB]

Avalanche Bulletin - Banff, Yoho and Kootenay National Parks

Issued Sun Apr 20, 2014 17:00
Valid Until Mon Apr 21, 2014 17:00
Put a wide margin between yourself and cornices, as they are particularly sensitive at the moment. Additionally, watch out for a weather system that will move into the region starting Tuesday and elevating the hazard.

        

Danger Ratings: Monday

alpine treeline below treeline alpine: 2 - Moderate, treeline: 2 - Moderate, below treeline: 2 - Moderate
alpine: 2 - Moderate
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
  • 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.
More...
treeline: 2 - Moderate
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
  • 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.
More...
below treeline: 2 - Moderate
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
  • 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.
More...
Forecast Tuesday Wednesday
alpine
2 - Moderate 3 - Considerable
treeline 2 - Moderate 3 - Considerable
below treeline 3 - Considerable 3 - Considerable
Confidence: Poor - Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Weather Observations

Past 24 Hr WeatherN Kootenay 1985/2405mBow Summit 2000mSunshine 2200m
Maximum (°C)Not AvailableNot AvailableNot Available
Minimum (°C)Not AvailableNot AvailableNot Available
Snowfall (cm)Not AvailableNot AvailableNot Available
Snow Pack (cm)Not AvailableNot AvailableNot Available
Wind speedNot AvailableNot AvailableNot Available
Ridgetop wind directionNot AvailableNot AvailableNot Available
Past 24 Hr WeatherN Kootenay 1985/2405mBow Summit 2000mSunshine 2200m
Maximum (°C)Not AvailableNot AvailableNot Available
Minimum (°C)Not AvailableNot AvailableNot Available
Snowfall (cm)Not AvailableNot AvailableNot Available
Snow Pack (cm)Not AvailableNot AvailableNot Available
Wind speedNot AvailableNot AvailableNot Available
Ridgetop wind directionNot AvailableNot AvailableNot Available
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.

Problem 1: Loose Wet

Which Elevation?

Which Elevation? below treeline, treeline

Which Slopes?

Which Slopes? west, southwest, south, southeast

Chance of Avalanches?

Chance of Avalanches? possible

Expected Size?

Expected Size? small - large
This problem will be active on solar exposures receiving daytime heating. Cloudy skies will mitigate the severity of the wet spring cycle to a certain extent.

Travel and Terrain Advice

  • Start and finish early before the surface crusts melt.

Problem 2: Deep Persistent Slabs

Which Elevation?

Which Elevation? alpine

Which Slopes?

Which Slopes? south, southeast, east, northeast, north, northwest, west, southwest

Chance of Avalanches?

Chance of Avalanches? unlikely - possible

Expected Size?

Expected Size? small - large
Inputs to watch out for are intense solar radiation. Although there is low likelihood that this avalanche problem will occur, the consequences are high if it does.

Travel and Terrain Advice

  • Be aware of the potential for full depth avalanches due to deeply buried weak layers.