Lawinenlagebericht

South Rockies

Apr 3 – 4, 2014Avalanche Canada
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Archiviert · abgelaufen 12 years ago

Lawinengefahr

Sat
Sun
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–3
    Forecast Southwest winds may continue to transport snow into pockets of wind slab on lee slopes. Weak cornices may continue to develop new growth that may be easy to trigger.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    3–6
    Avalanches releasing on the deeply buried weak layer from early February are still a concern. Strong solar radiation, cornice falls, new loading, or storm slab avalanches in motion are all possible triggers.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain on Friday

Weather Forecast

Overnight and Friday: Freezing level dropping to about 1500 metres overnight and then rising to 2000 metres during the day. Strong Southwest winds combined with light precipitation overnight and during the day.Saturday: Winds becoming more Westerly as the light precipitation continues. Freezing levels rising to 2000 metres during the day.Sunday: Chance of moderate precipitation overnight combined with moderate Westerly winds. Freezing levels rising to 2000 metres during the day.

Avalanche Summary

No new avalanches reported. I suspect that loose moist or wet snow may release naturally on solar exposed terrain. Cornices have been reported to be very large and may be weakened by exposure to the strong sun of April.

Snowpack Summary

Solar radiation and high freezing levels have created new melt-freeze crusts on Southerly aspects. The 20-40cm of recent new snow sits on top of a thick sun crust on solar aspects. 70-90 cm of settling storm snow from the past week rests on a graupel layer that can be found in much of the region. This makes for around 90 cm on top of the mid march crust at this point. This crust exists on all aspects below 2000m and on solar aspects in the high alpine. North of Sparwood and in the Crowsnest Pass area, the buried crust seems more specific to previously sun-exposed slopes. The deep facet/crust persistent weakness buried at the beginning of February (now down 140 to 170cm) seems unlikely to trigger in areas where the hard, supportive crust exists. No matter where you are in the region, this weakness should stay on your radar as any activity at this interface would be large and destructive. Possible triggers include a large cornice fall, a large input in a thin snowpack area or solar warming.

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