Bollettino valanghe

South Coast Inland

Dec 24, 2018Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

Wind slabs may linger at higher elevations. For the north of the region, be diligent around treeline, where a buried weak layer still lingers. See the forecaster's blog, which describes this persistent problem: www.avalanche.ca/blogs/persistent-slab

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Expect to find wind slabs in the immediate lees of terrain features. They may take a couple of days to bond to underlying surfaces.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3
    A weak layer buried 100 to 150 cm has the potential to produce large avalanches. This layer is likely most problematic in the north of the region and possibly the far south, around treeline and lower alpine elevations.

Confidence

Moderate - Due to the number of field observations.

Weather Forecast

SUNDAY NIGHT: Mostly cloudy, freezing level 1000 m. MONDAY: Clearing over the day, light south winds, alpine temperature -8°c, freezing level 900 m. TUESDAY: A mix of sun and cloud, light northwest winds, alpine temperature -9°c, freezing level below valley bottom. WEDNESDAY: Mostly cloudy, light southwest winds, alpine temperature -9°c, freezing level below valley bottom.

Avalanche Summary

No avalanches were observed in the region on Saturday. The last large cycle was on Thursday in the north of the region, with large avalanches up to size 3. These avalanches ran within the storm snow as well as on the weak layer described in the snowpack summary.

Snowpack Summary

Around 10 cm of snow fell in the region on Sunday with associated strong winds, likely forming small wind slabs in the immediate lees of ridges. Below around 1800 m, expect the storm snow to sit on melt-freeze crust formed by rain from Thursday's storm. In the north portion of the region and possibly the far south, a weak layer of facets and surface hoar lies below all this storm snow, around 100 to 150 cm deep. The weak layer appears most prominent around treeline, up to 2000 m. While the layer is likely gaining strength, field observations show that slab avalanches remain possible on this layer where it exists. See this MIN post for snowpack test results around the Duffey on this layer. Near the base of the snowpack, a crust exists with weak and sugary facets beneath it. This could potentially still be of concern in high north-facing aspects where the snowpack rests on very smooth ground cover.

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