Lawinenlagebericht

Banff Yoho Kootenay

Mar 12, 2019Parks Canada
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Archiviert · abgelaufen 8 years ago

Lawinengefahr

Wed
Thu
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

New snow and strong winds will form slabs over the previous weak facet layer resulting in a rising hazard level. We have seen a few slides run further than expected. Make conservative terrain choices until more is known about how this new snow reacts

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2.5
    New snow and strong SW winds are building slabs in open areas above treeline. These slabs are sitting on the weak, faceted snow that was previously on the surface and as a result can run further than expected when triggered.

  • Loose Dry

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2
    Previous cold temperatures created weak, faceted surface snow. In steep terrain, these facets remain easily triggered and can gain enough mass to affect skiers and climbers. Narrow gullies are where this is most concerning.

Weather Forecast

Upper elevation winds will remain strong Monday night then slowly diminish during the day on Tuesday becoming light by Tuesday night. 5-10 cm of new snow is forecast for Monday night and into Tuesday. Alpine temperatures will hold steady Monday night near - 10'C and begin dropping on Tuesday. Valley bottoms will see high temperatures near freezing.

Snowpack Summary

Strong SW winds Monday have redistributed recent snow into wind slabs in open areas above treeline. This recent snow sits over weak facets, previous wind effect or sun crusts on steep solar aspects. The mid pack varies from supportive in thicker snowpack areas to weak and completely faceted in thin areas.

Avalanche Summary

Small natural avalanches and spindrift avalanches were observed in the alpine Monday afternoon as the winds increased. Some of these traveled long distances entraining facets and running full path. Several skier triggered slabs have occurred in the last couple days, and avalanche control Sunday produced slabs up to size 2.5 running to treeline.

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

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