Avalanche forecast

Banff Yoho Kootenay

Nov 19 – 20, 2011Parks Canada
View on map
Archived · expired 15 years ago

Avalanche danger

Sat
Sun
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
Open full map

Highlights

Wind transport triggered two size 2.5 slab avalanches on Bourgeau 7 near Sunshine in the last 24 hrs. These slabs failed on the DH at the ground with crowns approximately 80cm thick and 100m wide. Be very cautious as human triggering is likely. JBW

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–3
    Slopes that look inviting for skiing have a wind slab over depth hoar layering. Cracking, whumphing, natural and skier triggered avalanches have been observed. This layer collapses with EASY results. Pick lower angled low consequence terrain.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–3
    Steep open slopes at and above treeline have a soft to hard surface slab that is sensitive to human triggering near the ground on the basal depth hoar. Wind loading triggered Na avalanches up to size 2.5 that failed to ground in the last 24 hrs.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Regions covered