Lawinenlagebericht

South Columbia

Mar 30 – 31, 2013Avalanche Canada
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Lawinengefahr

Mon
Tue
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Kernpunkte

Danger could INCREASE TO CONSIDERABLE with intense radiation on south and west aspects, especially at treeline and below. Be aware of how the warm weather is changing the snowpack.

Lawinenprobleme

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    2–6
    Cornice falls are a concern during warming. Slopes with corniced entrances, or exposed to cornice falls should be avoided. It is possible that the weight of a cornice dropping onto the slope below could trigger an avalanche on the Mid-March crust.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–5
    Warm temperatures and strong solar radiation may cause loose moist or wet snow avalanches. Keep an eye on changing conditions: Avalanche activity, snowballing, moist and wet snow are initial indicators of deterioration and increased hazard.

Confidence

Good

Weather Forecast

Same story, sunglasses and sunscreen required. A dominating high pressure system with sunny skies, rising freezing levels and light winds continues through to Monday. The pattern will start to deteriorate by Tuesday, showing increased cloud and grey skies with no precipitation. Sunday: Few to scattered high cloud. Alpine temperatures 5.0 and freezing levels 2500 m. Ridgetop winds light from the NW.Monday: Scattered clouds. Alpine temperatures 6.0 and freezing levels rising to 2600 m. Ridgetop winds blowing light from the NW.Tuesday: Cloudy. Alpine temperatures -1.0 and freezing levels falling to 2300 m. Ridgetop winds blowing light from the SW.

Avalanche Summary

Solar aspects have been very active showing loads of natural loose wet avalanches and cornice releases up to size 2.5. I expect natural avalanche activity to continue with freezing levels to the moon and sunny skies throughout the forecast period.

Snowpack Summary

Surface faceting and surface hoar growth ( up to 20 mm) has been prevalent on shady slopes and at upper elevations, while the surface snow on sun-exposed slopes and at lower elevations has been subject to daily melt-freeze cycles. Cornices are large and weak. Surface hoar buried March 10th is down more than a metre in most places. This layer seems to be bonding in most places and is a low probability - high consequence problem. If triggered, it would probably require a very large load (cornice fall) or hitting the sweet spot in thin, variable snowpack areas.

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