Lawinenlagebericht

Northwest Coastal

Apr 3 – 4, 2017Avalanche Canada
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Archiviert · abgelaufen 9 years ago

Lawinengefahr

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

Increasing cloud and wind on Tuesday as a storm approaches the coast. Watch for reactive slabs in steep or wind loaded terrain.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2
    Recent storm snow may still be reactive on steep convexities and on wind loaded terrain features at higher elevations.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–3
    A weak layer from February remains a concern. It produced several large human triggered avalanches at the end of March, and may still react in shallow areas. Heavy loads such as a storm slab avalanche or a cornice fall are also possible triggers.

Confidence

High -

Weather Forecast

TUESDAY: Overcast with snow starting midday and about 5 cm by the end of the afternoon, south wind increasing to 50-80 km/h, freezing level up to 1200 m.WEDNESDAY: 15-25 cm of new snow, strong south wind, freezing level around 1200 m.THURSDAY: Linger flurries with another 5-15 cm, moderate southwest wind, freezing level dropping to 700 m.

Avalanche Summary

On Sunday, a few recent natural storm slabs were reported (up to size 2), mostly sliding on 20-30 cm deep crusts. A few cornice falls and loose dry avalanches were reported as well. Recent storm snow may remain reactive to human triggers, especially as wind speeds increase on Tuesday.

Snowpack Summary

20-30 cm of recent storm snow is settling at higher elevations. Thick supportive crusts are forming overnight below 1300 m and deteriorating throughout the day with warming. The snow below treeline may become weak and release as loose wet avalanches in steep unsupported terrain features. The late February persistent weak layer continues to be a concern for triggering large avalanches. This combination of crust and weak facets is now down 100-150 cm, and may be triggered by light loads in shallow weak spots.

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