Bollettino valanghe

South Columbia

Dec 15 – 16, 2021Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 5 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

Avoid wind loaded features especially in areas where snowpack depths vary and a persistent weak layer is present.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1–2

    Isolated wind slab can still be found in exposed treeline and alpine features.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3

    40-70 cm of snow sits over a weak layer on a thick crust. While only a handful of avalanches have been reported to have run on this layer, they have been large. Avalanches on this layer may be triggered by humans or vehicles from thin spots or by large loads like wind slab avalanches.

Confidence

Moderate -

Weather Forecast

Tuesday night: light alpine winds from the west with some light flurries. Low of -9 at 1600m.

Wednesday: Trace amounts of new snow with moderate Southwest winds. High of -7 at 1600m.

Thursday: Up to 5cm of new snow with a high of -7 at 1600m. Winds becoming strong from the Northwest.

Friday: no new snow expected. Moderate winds from the Northwest shifting to the Southwest. High of -11 at 1600m.

Avalanche Summary

Several skier triggered and natural wind slabs up to size 2 were observed in the region on Monday. These avalanches were in the upper treeline and alpine elevation and on North and East aspects.

Snowpack Summary

Up too 20cm of recent new snow has formed wind slab in isolated features in exposed treeline and alpine terrain. 

The defining feature of the snowpack is a prominent and widespread crust that reaches as high as 2400 m in the alpine and now sits 40-80 cm below the surface. In many places, overlying snow is well-bonded to the crust but in others weak faceted grains have been observed growing above it.

Average snowpack depth at treeline is 200cm.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

Regioni coperte