[CJ]

Avalanche Bulletin - Banff, Yoho and Kootenay National Parks

Issued Thu May 22, 2014 17:00
Valid Until further notice
Regular avalanche bulletins have ended. We will update if there are significant changes. For specific condition information during spring and summer, see Parks Mountain Safety, the Mountain Condition Reports or contact Visitor Safety at 403-762-1470.

        

Danger Ratings: Friday

alpine treeline below treeline alpine: N/A - No Rating, treeline: N/A - No Rating, below treeline: N/A - No Rating
alpine: N/A - No Rating
N/A - No Rating N/A
N/A
treeline: N/A - No Rating
N/A - No Rating N/A
N/A
below treeline: N/A - No Rating
N/A - No Rating N/A
N/A
Forecast Saturday Sunday
alpine
N/A - No Rating N/A - No Rating
treeline N/A - No Rating N/A - No Rating
below treeline N/A - No Rating N/A - No Rating
Confidence: Good

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? alpine, treeline, below treeline

Which Slopes?

Which Slopes? west, southwest, south, southeast, east

Chance of Avalanches?

Chance of Avalanches? likely

Expected Size?

Expected Size? small - large
Intense sun, daytime heating or high overnight freezing levels will result in loose wet avalanches out of steep terrain. Start trips early and plan to be out of avalanche terrain before things heat up.

Travel and Terrain Advice

  • Travel early before the heat of the day, and avoid big slopes in the afternoon.
  • Watch for clues, like sluffing off of cliffs, that the snowpack is warming up.

Problem 2: Cornices

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 - large
With warm temperatures cornices will become weak and fail. Minimize your exposure to cornices and keep a close eye on the temperatures and solar effect on the slopes above you.

Travel and Terrain Advice

  • Cornices become weak with daytime heating, so travel early on exposed slopes.

Problem 3: Deep Persistent Slabs

Which Elevation?

Which Elevation? alpine, treeline

Which Slopes?

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

Chance of Avalanches?

Chance of Avalanches? unlikely - possible

Expected Size?

Expected Size? large - large
We have seen a lot of avalanche activity on the basal facets during sustained periods of warm temperatures or intense rain and wet snow events up to size 3.

Travel and Terrain Advice

  • Travel early before the heat of the day, and avoid big slopes in the afternoon.