Lawinenlagebericht

Blue River

Jan 22 – 23, 2024Avalanche Canada
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Archiviert · abgelaufen 3 years ago

Lawinengefahr

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

Wind slabs may persist longer than normal where they rest on a weak layer of facets.

Persistent weakness in the snowpack warrants a conservative approach to large or steep slopes.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    1–2

    Wind slabs continue to develop with new snow available for transport. They may be slow to bond to the facets below.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–3.5

    Two weak layers of surface hoar and facets exist deeper in the snowpack.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–3.5

    Basal facets remain a concern in steep, rocky alpine features with thin-to-thick snowpack transitions.

Confidence

Moderate

Avalanche Summary

A few natural loose dry avalanches were reported over the weekend (size 1 to 2) out of steep alpine terrain.

Natural wind slab activity has started to taper off, however, small (size 1 to 2) rider triggered wind slabs were still being reported on Friday.

Earlier in the storm on Wednesday, two persistent slab avalanches (size 1 and 2) were remotely triggered by skiers in the Northern Selkirks. These avalanches occurred on north aspects at treeline.

Snowpack Summary

20 to 30 cm of surface snow is now resting on a variety of old snow surfaces including faceted snow, surface hoar and firm wind slabs in open terrain at treeline and above.

Down 60 to 80 cm a crust, facet, and/or surface hoar layer exists.

130+ cm down another surface hoar layer exists that was buried in early December. This seems to be of most concern above 2000 m where a robust crust doesn't exist above it, or in shallow snowpack areas.

Weather Summary

Sunday Night

Cloudy with up to 3 cm of snow, south alpine wind 10-40 km/h, treeline temperature around -6 °C.

Monday

Cloudy with up to 3 cm of snow, south alpine wind 10-40 km/h, treeline temperature around -2 °C.

Tuesday

Cloudy with 5-15 cm of snow, south alpine wind 10-30 km/h, treeline temperature around -2 °C.

Wednesday

Cloudy with up to 5 cm of snow, southwest alpine wind 20-40 km/h, treeline temperature around -2 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.
  • Keep in mind that human triggering potential persists as natural avalanching tapers off.

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