Boletín de aludes

Kootenay Boundary

Jan 15 – 16, 2023Avalanche Canada
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Archivado · caducó 4 years ago

Peligro de aludes

Tue
Wed
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Continually assess the snowpack for signs of instability. Be especially suspicious of shallow or rocky ridges and start zones.

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–1.5

    Gusty wind and additional flurries will perpetuate the avalanche problem. Watch for more reactive pockets in open or alpine terrain. A weak layer of surface hoar is reported 20-40 cm below recent snow, possibly allowing slabs to be larger than expected. A few other concerning layers are found in the snowpack, however, recent avalanches seem to be within the storm interface.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    2–3.5

    Weak, faceted grains make up the basal snowpack. Where supportive to riders, a melt-freeze crust may be providing a bridging effect, making it more difficult to trigger deeper layers. Be especially suspicious of shallow or cross-loaded areas with variable snow depths.

Confidence

Moderate

Avalanche Summary

A widespread and reactive storm slab was reported around the region Friday. Skiers, vehicles, and explosives triggered slabs to size 2.5 with most crowns 30-50 cm deep, and many reported at treeline elevations 1700-2100 m (note poor visibility and no alpine observations).

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

Snowpack Summary

Flurries through Sunday may accumulate up to 15 cm. Fresh snow will cover a crust or moist snow up to 1900 cm. At higher elevations, 20-40 cm of recent snow has buried a layer of surface hoar in wind-sheltered terrain, primarily around treeline.

A facet/crust layer is down 40-90 cm (and 2-10 cm thick at TL elevation), and the mid-pack below is settled and consolidated. A concerning and weak layer of crust and facets makes up the basal snowpack. Treeline snow depths average 150-210 cm.

Weather Summary

Saturday night

Partly cloudy and isolated flurries. Light southeast ridgetop wind increasing into the morning. Treeline low temperature below -3 C. Freezing level falling below 1000 m.

Sunday

Flurries through the day, up to 15 mm in 24 hours, localized areas could accumulate 20 cm. Gusty south-southwest ridgetop wind. Treeline high temperature 0 C. Freezing falling to valley bottom.

Monday

Flurries through the day, up to 5 cm. Decreasing south ridgetop wind. Treeline high temperature -2 C. Freezing level 1300 m.

Tuesday

Cloudy with isolated flurries. Light southwest ridgetop wind. Treeline high temperature -3 C, freezing level below 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Closely monitor how the new snow is bonding to the old surface.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

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