[SS]

Avalanche Bulletin - Banff, Yoho and Kootenay National Parks

Issued Fri Nov 28, 2014 17:00
Valid Until Sat Nov 29, 2014 17:00
Avalanche conditions are expected to remain touchy. Weak basal snow and a deep storm layer should be given time to settle. Watch for windslabs in exposed locations. Conservative route selection is advised through the weekend. JPK

        

Danger Ratings: Saturday

alpine treeline below treeline alpine: 4 - High, treeline: 3 - Considerable, below treeline: 3 - Considerable
alpine: 4 - High
4 - High Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
  • 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.
More...
treeline: 3 - Considerable
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.
  • 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.
More...
below treeline: 3 - Considerable
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.
  • 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.
More...
Forecast Sunday Monday
alpine
3 - Considerable 3 - Considerable
treeline 3 - Considerable 2 - Moderate
below treeline 2 - Moderate 1 - Low
Confidence: Good

Weather Observations

Past 24 Hr WeatherSimpson 2115/2320mBow Summit 2040mSunshine 2200m
Maximum (°C)Not AvailableNot Available-2
Minimum (°C)Not AvailableNot Available-24
Snowfall (cm)Not AvailableNot Available18
Snow Pack (cm)Not AvailableNot Available103
Wind speedNot AvailableNot AvailableModerate (26-40 km/h)
Ridgetop wind directionNot AvailableNot AvailableSW
Past 24 Hr WeatherSimpson 2115/2320mBow Summit 2040mSunshine 2200m
Maximum (°C)Not AvailableNot Available-2
Minimum (°C)Not AvailableNot Available-24
Snowfall (cm)Not AvailableNot Available18
Snow Pack (cm)Not AvailableNot Available103
Wind speedNot AvailableNot AvailableModerate (26-40 km/h)
Ridgetop wind directionNot AvailableNot AvailableSW
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: Wind Slabs

Which Elevation?

Which Elevation? treeline, alpine

Which Slopes?

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

Chance of Avalanches?

Chance of Avalanches? likely

Expected Size?

Expected Size? small - large

Problem 2: Storm Slabs

Which Elevation?

Which Elevation? below treeline, treeline, alpine

Which Slopes?

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

Chance of Avalanches?

Chance of Avalanches? likely

Expected Size?

Expected Size? small - large