Boletín de aludes

Purcells

Dec 20 – 21, 2019Avalanche Canada
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Archivado · caducó 7 years ago

Peligro de aludes

Sun
Mon
Alta montaña
4 · Fuerte
Límite del bosque
4 · Fuerte
Bajo el límite
4 · Fuerte
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Lo esencial

An intense winter storm is delivering heavy snowfall and strong winds over much of the region. Widespread avalanche activity is expected. Avoid avalanche terrain.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    2–3

    Weak layers near the base of the snowpack remain a concern. Likely trigger points are shallow rocky areas.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1.5–3

    Intense loading from heavy snow and strong winds will mean that an avalanche cycle is almost certain. Avoid avalanche terrain, and don't underestimate the potential for avalanches to run full path.

Confidence

Moderate - Uncertainty is due to the track & intensity of the incoming weather system. Forecast snowfall amounts are uncertain.

Weather Forecast

THURSDAY NIGHT - Snow, 15-30 cm / southwest wind, 30-60 km/h / alpine low temperature near -7

FRIDAY - Snow, heavy at times, 20-40 cm / southwest wind, 40-80 km/h / alpine high temperature near -2 / freezing level 1500 m

SATURDAY - Snow, heavy at times, 15-25 cm / southwest wind, 40-80 km/h / alpine high temperature near -2 / freezing level 1600 m

SUNDAY - Cloudy with sunny periods and isolated flurries / southeast wind, 10-20km/h / alpine high temperature near -8

Avalanche Summary

Significant snowfall amounts, warm temperatures and strong to extreme winds will mean that a natrual avalanche cycle is almost certain for most of the Purcells on Friday.

On Sunday there was a report of a size 3 explosive controlled deep persistent slab avalanche on a north aspect in the alpine. The fracture was 150 cm deep. On Monday there were also reports of a few explosives controlled size 1.5 deep persistent slab avalanches on north aspects at treeline.

Snowpack Summary

An intense winter storm is underway over most of the Purcell region, with anywhere from 15-30 cm overnight Thursday, and another 20-40 cm possible over much of the region throughout the day on Friday. The most significant snowfall amounts are expected further south in the region, with areas near Golden receiving lower amounts.

Anywhere from 40-100 cm of recent snow may sit on a weak layer of surface hoar in sheltered areas at treeline. A second layer of surface hoar primarily found in the in north of the region is found 60-90 cm below the surface in sheltered areas at treeline. There are a variety of crusts buried in the mid to lower snowpack. These crusts have mostly broken down. The base of the snowpack generally consists of facets and depth hoar.

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