[SS]

Avalanche Bulletin - Banff, Yoho and Kootenay National Parks

Issued Tue Nov 25, 2014 17:00
Valid Until Wed Nov 26, 2014 17:00
The storm is going to peak Weds night. If forecasted amounts of snow come to fruition the danger rating could go to Considerable in the alpine on Thurs. Expect rugged conditions (rocks/bush) BTL.

        

Danger Ratings: Wednesday

alpine treeline below treeline alpine: 2 - Moderate, treeline: 2 - Moderate, below treeline: N/A - No Rating
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: N/A - No Rating
N/A - No Rating N/A
N/A
Forecast Thursday Friday
alpine
3 - Considerable 2 - Moderate
treeline 2 - Moderate 2 - Moderate
below treeline 1 - Low 1 - Low
Confidence: Fair - Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Weather Observations

Past 24 Hr WeatherSimpson 2115/2320mBow Summit 2040mSunshine 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 WeatherSimpson 2115/2320mBow Summit 2040mSunshine 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: Wind Slabs

Which Elevation?

Which Elevation? alpine, treeline

Which Slopes?

Which Slopes? northeast, east, north, southeast

Chance of Avalanches?

Chance of Avalanches? possible

Expected Size?

Expected Size? small - large
With the addition of new snow, expect windslabs to up to 40cm thick in lee areas.

Travel and Terrain Advice

  • Be careful with wind loaded pockets while approaching and climbing ice routes.

Problem 2: Loose Dry

Which Elevation?

Which Elevation? alpine

Which Slopes?

Which Slopes? north, northeast, east, southeast

Chance of Avalanches?

Chance of Avalanches? possible

Expected Size?

Expected Size? small - small
This problem will be most prevalent in gulley features.

Travel and Terrain Advice

  • Avoid travelling under cliffs that are exposed to sluffing from above.
  • The volume of sluffing could knock you over; choose your climb carefully and belay when exposed.