Avalanche forecast

South Columbia

Feb 27 – 28, 2015Avalanche Canada
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Archived · expired 12 years ago

Avalanche danger

Sun
Mon
Alpine
1 · Low
Treeline
1 · Low
Below
1 · Low
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Highlights

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Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely
    Size
    3–5
    Triggering persistent slab avalanches has become unlikely, but may be possible with large loads like cornice falls. Periods of strong solar radiation may allow for triggering from weak thin snowpack areas.

Confidence

Good

Weather Forecast

Clear overnight with freezing down to valley bottoms and temperatures around -10 in the alpine. Light northwest winds and clear skies with freezing levels rising to near 1200 metres on Saturday. Some cloud developing Saturday night and continuing during the day Sunday with no precipitation and light southwest winds. Cloudy with 3-5 cm of new snow and moderate northerly winds on Monday.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

At higher elevations, up to 10 cm of wind-pressed snow overlies the previous variable snow surface of surface hoar, crusts, or wind affected snow depending on aspect and elevation. The "Valentine's Day" crust is just below the surface and is now strong and thick in most places. Thin isolated wind slabs may still be reactive in high elevation lee terrain, and cornices remain large and weak. The late-Jan crust/surface hoar layer (up to 100 cm deep) and the mid-January surface hoar (80-120 cm deep) are generally dormant, and chances of triggering these weaknesses have decreased. However, triggering may be possible with a large input such as cornice fall, or an avalanche stepping down, especially on sun drenched slopes.

Regions covered