Avalanche Forecast

Issued: Nov 14th, 2020 3:00PM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is below threshold. Known problems include Wind Slabs.

Avalanche Canada JMackenzie, Avalanche Canada

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Snow and wind through the day on Sunday will increase the danger levels. Conservative route choices are advised.

Summary

Confidence

Moderate -

Weather Forecast

Sunday could bring 10cm of new snow, temperatures reaching -5C and SW winds as strong as 100km/h. All of this points to increased avalanche activity.

Avalanche Summary

Visibility was somewhat limited today, but a few loose dry avalanches up to size 1.5 were observed in very steep Alpine terrain in N, E and S aspects.

Snowpack Summary

10 to 15cm of snow has fallen in the past 24 hours, and light flurries continued through much of Saturday. Winds were strong to extreme form W and SW at upper elevations creating widespread wind slab conditions on N, E and SE aspects. At treeline these slab conditions are less profound, but are still present in wind prone areas. Watch for wind slabs in the immediate lee of ridgelines and in cross-loaded and lee gully features. Where the recent wind slab overlies the November crust (which has been found as high as 2700m in the Highwood), these slabs could be quite sensitive to human triggering. The November crust is now buried between 20 and 50cm deep. The extensive winds on Saturday were also causing some loose dry avalanches in extreme terrain.

Terrain and Travel

  • Avoid lee and cross-loaded slopes at and above treeline.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.
  • Ice climbers should be equipped with avalanche safety gear.
  • Avoid terrain traps such as gullies and cliffs where the consequence of any avalanche could be serious.

Problems

Wind Slabs

An icon showing Wind Slabs

Incoming snow and winds will lead to additional wind slab development. A natural avalanche cycle is possible, and human triggering is very likely. Be especially cautious where the fresh wind slabs overlie the previously formed November crust layer.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood

Likely - Very Likely

Expected Size

1.5 - 2.5

Valid until: Nov 15th, 2020 3:00PM

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