Lawinenlagebericht

Blue River

Jan 25 – 26, 2024Avalanche Canada
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Archiviert · abgelaufen 3 years ago

Lawinengefahr

Sat
Sun
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Kernpunkte

Storm slabs are resting on a layer of facets and will be slow to bond. Reactivity may persist longer than usual.

Be mindful of buried weak layers that have produced large recent avalanches.

Lawinenprobleme

  • 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.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2.5

    New storm slabs have been building with continued snow and warm weather. They are resting on a weak layer of facets and in places surface hoar. This could mean they will be more reactive and slower to bond.

  • 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

Storm slabs have been reactive, sliding on a facet layer below the recent storm snow. A natural cycle was observed Sunday up to size 2. On Monday and Tuesday, numerous rider-triggered avalanches, (including, ski cuts, accidentally and remotely triggered avalanches) were reported size 1-2.

Buried weak layers have also been active in recent days. Naturals have been reported to size 3, as well as several size 1-2 triggered by riders from shallow, weak or rocky spots.

Snowpack Summary

15 to 30 cm of recent snow sits poorly bonded to old surfaces including faceted snow, surface hoar and firm wind slabs.

The mid pack contains a few layers of concern including a surface hoar/facet/crust layer buried 60 to 80 cm deep.

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

Wednesday night

Mostly cloudy with flurries bringing around 5 cm of new snow. South alpine wind 40 km/h. Treeline temperature -3 °C.

Thursday

Mostly cloudy with flurries brining around 5 cm of new snow. South alpine wind 30-40 km/h. Treeline temperature -2 °C. Freezing level 1300 m.

Friday

5-10 cm of new snow overnight then a mix of sun and cloud. Southwest alpine wind 30-40 km/h, treeline temperature -1 °C, freezing level 1400 m.

Friday

Mostly cloudy with flurries brining around 5 cm of new snow. Southwest alpine wind 40-50 km/h. Treeline temperature 0 °C. Freezing level 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

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