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Avalanche Forecast

Archived

Nov 23rd, 2023–Nov 25th, 2023

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Early Season
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Early Season
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Early Season

Regions

Kananaskis, Bow Valley, Highwood Pass, North 40, Spray - KLakes.

At least it looks like winter! We're still in the early stages of our snowpack, so be prepared for variable snow depths and barely buried hazards. Ski slowly and climb carefully.

Confidence

Low

Avalanche Summary

Nothing new has been noted in the last couple of days but still lots of older signs of avalanche activity.

Snowpack Summary

In the last 24-36 hours we've had 5-10cm of new snow with minor wind effect. The talk around the forecaster's water cooler today was if there's a new buried crust from the recent heat. It was decided there likely is, but probably only in isolated areas. Steep south and south-west slopes and valley bottom areas will be the most likely places. At this point, its probably a non-issue but that will change as the load increases. Given the dry forecast, its more probable that this crust will facet/rot away and not be an issue. Time will tell. Buried windslabs and a poor base are still on the list of avalanche considerations.

Weather Summary

Winds are expected to shift to a northerly flow tomorrow around noon. While not a huge change, there will likely be gusty winds and possibly wind loading as the wind swings around. Temperatures will rise to -3 at 2300m and little to no precipitation is expected. This Ho-Hum pattern will continue for a few days atleast.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.
  • Avoid lee and cross-loaded terrain.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid terrain traps where the consequence of any avalanche could be serious.
  • Watch for fresh storm slabs building throughout the day.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.