Bollettino valanghe

Lizard-Flathead

Feb 8 – 9, 2023Avalanche Canada
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Archiviato · scaduto 4 years ago

Pericolo valanghe

Fri
Sat
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

New snow snow combined with wind will continue to promote wind slab formation. Stiff, wind deposited snow can be expected to avalanche under the weight of a rider.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2

    10 to 20 cm of recent snow coupled with southwest wind could continue to build wind slabs in lee terrain features.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2.5–3.5

    A layer of faceted grains near the base of the snowpack remains on the radar for areas of this region where the snowpack is shallow and where a hard melt-freeze crust formed around Christmas doesn't exist. Deep persistent slab avalanches have not been reported in the region for some time, however, the weak snowpack structure in these shallow areas may still be triggered with a heavy load.

Confidence

Moderate

Avalanche Summary

On Saturday, east of Fernie, a couple of small to large natural and rider triggered avalanches were reported that involved cornices. See the MIN report for more information.

Natural and rider-triggered (size 1 to 1.5) wind slabs have been recently reported at treeline and alpine elevations. This MIN report from the South Rockies field team is a good example of terrain where wind slabs are more likely to be triggered.

Please continue to share any observations or photos on the Mountain Information Network.

Snowpack Summary

A dusting of new snow covers 10 to 15 cm of storm snow from late last week that was redistributed by moderate to strong winds which developed wind slabs at treeline and alpine elevations. This overlies previous wind slabs, or a melt-freeze crust below 1900 m.

Deep weak layers formed early season are slowly gaining strength but are still a concern, especially in steep rocky terrain features.

Weather Summary

Tuesday night

Mainly cloudy. 5-15 cm of snow expected. Light to moderate southwest ridgetop wind. Treeline temperature around -5 ºC.

Wednesday

Mostly cloudy with scattered flurries, accumulation 3-5cm. Moderate west ridgetop wind. Treeline temperature around -3 °C.

Thursday

Mix of sun and cloud. Moderate southwest ridgetop wind. Treeline temperature around -3 °C.

Friday

Mainly cloudy with flurries. Moderate to strong southwest ridgetop wind. Treeline temperature around -3 ºC.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Approach lee and cross-loaded slopes with caution.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.

Regioni coperte