Lawinenlagebericht

South Coast

Apr 7 – 8, 2015Avalanche Canada
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Archiviert · abgelaufen 11 years ago

Lawinengefahr

Thu
Fri
Hochgebirge
2 · Mässig
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
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Kernpunkte

Sunshine are warmth are the primary drivers of avalanche hazard. Avoid sun exposed slopes in the afternoon, and stick to higher, shady aspects for the best snow.

Lawinenprobleme

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–4
    Daytime warming and sunshine could weaken large overhanging cornices and cause them to fail. These are a hazard alone, but also a potential trigger for deeper weak layers.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–5
    A couple persistent weak layers are still present in the upper snowpack. These have not been reactive for a few days now, but intense spring sun or cornice falls could be enough to reawaken this problem. 

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    Expect loose wet activity on steep sun-exposed slopes during the day.

Confidence

Good - The weather pattern is stable

Weather Forecast

Wednesday: Mainly sunny. The freezing level climbs to around 2000 m during the day and drops below 1500 m overnight. Winds are light and variable. Thursday: Mainly sunny. The freezing level climbs to around 2000 m during the day and drops below 1500 m overnight. Winds are light and variable. Friday: Cloudy with light to moderate snow. The freezing level lowers to 1500 m and winds increase to moderate or strong from the S-SW.

Avalanche Summary

Moist loose avalanches have been reported on steep sun-exposed slopes, and one natural cornice fall (size 2) was reported on Monday. This cornice did not trigger a slab on the slope below.

Snowpack Summary

On shady slopes, 20-30 cm of low density storm snow sits on a strong and supportive rain crust that was buried last Saturday and extends as high as 2100m. Previous west-southwesterly winds have created thin new wind slabs in lee terrain, especially high N aspects. Expect an ongoing melt-freeze cycle on sun-exposed slopes. A facet/crust layer that was buried in mid-March is now approximately 50-100 cm down. Recently it was found down 55 cm near the Duffey Lake Road, and produced moderate sudden results. This remains a concern in the region because of it's potential for very large avalanches. Cornices are now large and mature and may collapse with daytime warming and intense sunshine.

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