Boletín de aludes

Purcells

Nov 25 – 26, 2016Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Sat
Sun
Alta montaña
Sin grado
Límite del bosque
Sin grado
Bajo el límite
Sin grado
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Lo esencial

Heavy snow is forecasted for the North Purcells on Saturday. Exercise extra caution during and after the storm.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2
    Touchy wind slabs are growing and primed for triggering on the downwind side of ridgecrests in exposed areas.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Recent storm snow is beginning to settle into a cohesive slab that may be bonding poorly to a hard crust or surface hoar. Forecasted snowfall will increase the size and sensitivity of storm slabs.

Confidence

-

Weather Forecast

20-25cm of new snow fell yesterday and overnight under the influence of light to moderate winds that trended from SE to SW and increased to gusts of 30km/h this morning. Up to 25cm of new snow is expected to fall in the north of the region on Saturday under light winds and a freezing level rising from 500m to 1000m. Southern parts of the region are expected to receive only trace amounts of new snow.

Avalanche Summary

Recent and forecasted snowfall are amplifying concerns for slabs and cornices forming at higher elevations and in exposed terrain. Recent reports include a natural Size 2 storm slab avalanche on a steep fan below a large alpine face in the Glacier Creek area. Check out the MIN report for for details including a photo.

Snowpack Summary

Snowfall from yesterday and overnight totaled 20-25 cm and contributed to a highly variable HS reported at 80-150cm yesterday. The new snowfall was accompanied by light to moderate winds, which will promote the growth of both cornices and touchy wind slabs that already exist in the region. Storm snow since Nov 13 has now accumulated to 60+cm and is settling into a cohesive slab over the hard Nov 13 CR. This crust is the primary weakness of concern and is expected to become increasingly reactive as the slab above settles and stiffens. Buried surface hoar has also been reported down 40cm on north aspects at upper treeline elevations, where it gave easy to moderate snowpack test results. The snowpack below treeline is creeping toward threshold for avalanches, but early season hazards such as hidden rocks, stumps, and open creeks remain the primary hazard here.

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