Lawinenlagebericht

South Coast

Apr 1 – 2, 2015Avalanche Canada
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Archiviert · abgelaufen 12 years ago

Lawinengefahr

Fri
Sat
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Kernpunkte

Deep persistent weaknesses are still reactive in snowpack tests. Very large avalanches are still possible.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    3–5
    There's some uncertainty as to how the deeply buried weak layers have responded to recent storms. A cautious approach is still required as avalanches failing at this interface may not be survivable.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    Recent storm accumulations have been shifted into deeper deposits by west through southwest winds. Watch for increased reactivity in exposed lee terrain.

Confidence

Good

Weather Forecast

Unsettled weather is expected to bring a mix of sun and cloud with isolated flurries on Thursday, before a more organized system brings 5-10 cm of snow on Friday and another 3-5 cm on Saturday. Freezing levels are expected to hover around 1500 m for the forecast period and winds are expected to pick up to moderate southwesterlies during on Friday.

Avalanche Summary

Over the past few days, several natural wind slab avalanches to Size 2 were observed in the north of the region. Two of of the larger avalanches possibly stepped-down to the mid-March persistent weakness on north facing alpine slopes. Also reported were several loose sluffs to Size 1.5 in response to sun-exposure on south aspects.

Snowpack Summary

Another 10-20 cm of low density storm snow adds to the 30 cm of recent moist snow capped by a thin crust, that overlies a rain crust buried last Saturday. Reports suggest this crust exists up to about 2100m. West through southwesterly winds have shifted these new accumulations into touchy wind slabs in exposed terrain. A facet/crust persistent weakness buried mid-March is down approximately 50-100 cm and recently produced moderate sudden results in snowpack tests where it was found down 55 cm near the Duffey Lake Road. This remains the chief concern amongst avalanche professionals in the region due to it's potential for very large avalanches.

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