Bollettino valanghe

South Columbia

Dec 26 – 27, 2018Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

Large human triggered avalanches remain possible. At these times it's less about snow and more about human factors. The bold will push into bigger lines, those with lower risk threshold will be content with more conservative terrain. Fx'r blog here.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–3
    The likelihood of persistent slab avalanches is gradually decreasing, but triggering a widespread weak layer buried 50 to 100 cm beneath the surface would have major consequences. This problem will likely linger through the holidays.

Confidence

Moderate -

Weather Forecast

Enjoy the brief lull in the weather Thursday and Friday, it looks like we will be right back into the storm track this weekend. What happens beyond that is a bit uncertain, a ridge of high pressure will likely take us into the New Year.WEDNESDAY NIGHT: Freezing level at valley bottom, light northerly wind, trace of snow possible. THURSDAY: Broken cloud cover, freezing level at valley bottom, light northerly wind with moderate gusts near ridgetop, no significant precipitation expected. FRIDAY: Scattered clouds at dawn with cloud cover building through the day, freezing level at valley bottom, light southwest wind at valley bottom with moderate to strong west/northwest wind in the alpine, a few centimeters of snow possible during the day. 2 to 8 cm of snow Friday night.SATURDAY: Overcast, freezing level beginning at valley bottom, rising to around 1500 m by sunset. Strong southwest wind, 8 to 15 cm of snow.

Avalanche Summary

No new avalanche activity to report from Tuesday. On Monday a few old size 2 natural avalanches were observed on south facing features between 1600 and 2300 m. The avalanche at 1600 m was notable as it was below treeline. As the sun made an appearance a few small loose avalanches were also observed.As recent as last Friday, large (size 2-3) persistent slab avalanches were occurring naturally.

Snowpack Summary

10 to 20 cm of low density snow sits above old wind slabs in the alpine, and in some isolated areas above small surface hoar (feathery crystals).A weak layer that formed during the dry spell in early December is now 50 to 100 cm deep. The layer is composed of weak facets, surface hoar, and a sun crust on steep south-facing slopes. This layer has been responsible for large persistent slab avalanches over the past two weeks, particularly on north and east facing slopes between 1900-2300 m and on steep south-facing slopes in the alpine.The lower snowpack is generally strong and settled, with a crust that formed in late October near the bottom of the snowpack.

Regioni coperte