Boletín de aludes

Purcells

Feb 17 – 18, 2022Avalanche Canada
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Archivado · caducó 5 years ago

Peligro de aludes

Sat
Sun
Alta montaña
1 · Débil
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Heightened avalanche conditions exist on steep convex slopes. Avalanches are less likely where thick crusts exist near the surface.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1.5–2.5

    Persistent slab avalanches are possible due to a surface hoar layer found 20 to 50 cm deep. While avalanche activity on this layer has been isolated lately, caution should be taken around steep open slopes at treeline, especially in terrain where surface hoar is most likely to be preserved - like cut blocks. Avalanche activity is less likely where a thick and supportive crust sits on the surface. 

Confidence

High - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

WEDNESDAY NIGHT: Partly cloudy skies with light flurries along the northern and western Purcells with up to 5 cm of new snow possible, moderate wind from the northwest, treeline temperatures drop to -10 C.

THURSDAY: Cloudy with scattered flurries bringing up to 5 cm of snow along the northern and western Purcells, moderate to strong wind from the west, treeline temperatures around -5 C with freezing level climbing to 1200 m.

FRIDAY: Mix of sun and cloud, light flurries along the western Purcells bringing a trace of snow, moderate wind from the northwest, treeline temperatures around -3 C with freezing level around 1500 m.

SATURDAY: Cloudy with flurries bringing 5-10 cm of snow, moderate wind from the southwest, treeline temperatures around -5 C with freezing level around 1200 m.

Avalanche Summary

No significant human triggered avalanches have been reported over the past week. Explosives have broken some large cornices over the past few days, but for the most part these have not triggered slabs on the slopes below. One exception was on Sunday when a cornice triggered a size 2.5 slab west of Forster Creek. This avalanche occurred on north aspect at 2250 m and failed on a 40 cm deep surface hoar layer.

Snowpack Summary

5 to 15 cm of fresh snow overlies a variety of surfaces. Higher elevations are heavily wind effected with a melt freeze crust on solar aspects. Lower elevations hold a widespread thick melt freeze on all aspects with surface hoar sitting above the crust in sheltered terrain. The late January interface is buried 20 to 40 cm deep, and consists of a melt-freeze crust at lower elevations and on solar aspects extending into the alpine. Surface hoar sits above the crust in sheltered areas at treeline and below. The snowpack below is well consolidated, with the early-December crust/facet persistent weak layer buried 80-150 cm deep. It is currently considered dormant. We expect this layer to become active later this season, check out the forecaster blog for more information.

Terrain and Travel

  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Pay attention to isolated alpine features as well as cross-loaded features at treeline.

Regiones cubiertas