[CJ]

Avalanche Bulletin - Banff, Yoho and Kootenay National Parks

Issued Sun Nov 23, 2014 17:46
Valid Until Mon Nov 24, 2014 17:00
We will see a slow rise in hazard through the early part of this week. New wind slabs building over the November rain crust will be the layer to watch for as more snow arrives.

        

Danger Ratings: Monday

alpine treeline below treeline alpine: 1 - Low, treeline: 1 - Low, below treeline: N/A - No Rating
alpine: 1 - Low
1 - Low Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
  • 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.
More...
treeline: 1 - Low
1 - Low Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
  • 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.
More...
below treeline: N/A - No Rating
N/A - No Rating N/A
N/A
Forecast Tuesday Wednesday
alpine
1 - Low 2 - Moderate
treeline 1 - Low 1 - Low
below treeline N/A - No Rating N/A - No Rating
Confidence: Fair - Timing, track, or intensity of incoming weather system is uncertain on Tuesday

Weather Observations

Past 24 Hr WeatherSimpson 2115/2320mBow Summit 2040mSunshine 2200m
Maximum (°C)-6Not Available-7
Minimum (°C)-10Not Available-13
Snowfall (cm)2Not Available2
Snow Pack (cm)65Not Available56
Wind speedModerate (26-40 km/h)Not AvailableModerate (26-40 km/h)
Ridgetop wind directionSWNot AvailableSW
Past 24 Hr WeatherSimpson 2115/2320mBow Summit 2040mSunshine 2200m
Maximum (°C)-6Not Available-7
Minimum (°C)-10Not Available-13
Snowfall (cm)2Not Available2
Snow Pack (cm)65Not Available56
Wind speedModerate (26-40 km/h)Not AvailableModerate (26-40 km/h)
Ridgetop wind directionSWNot 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? alpine, treeline

Which Slopes?

Which Slopes? northeast, east, north, southeast

Chance of Avalanches?

Chance of Avalanches? unlikely - possible

Expected Size?

Expected Size? small - small
Isolated, small wind slabs have been triggered on the November rain crust in the Sunshine area and seen in alpine gullies. These would be of consequence if they were triggered above a terrain trap, or if they pushed you off of a cliff or ice climb.

Travel and Terrain Advice

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