Bollettino valanghe

South Rockies

Dec 31, 2020 – Jan 1, 2021Avalanche Canada
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Archiviato · scaduto 6 years ago

Pericolo valanghe

Sat
Sun
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

Wind slabs may linger up high and it is still possible to trigger large avalanches on buried weak layers.

Problemi valanghivi

  • Wind Slabs

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

    Wind affected terrain is expected in exposed terrain at alpine and treeline elevations. Recent southwest wind has formed the newest slabs on north to east aspects.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1.5–3

    Weak layers of feathery surface hoar and/or sugary faceted grains above a hard melt-freeze crust remain buried in the snowpack around 40 to 90 cm deep. Although these layers are slowly bonding to the snowpack, the possibility remains that a rider could trigger them.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

WEDNESDAY NIGHT: Cloudy with light snowfall, accumulation 1 to 3 cm, 30 to 50 km/h west wind, alpine temperature -9 C.

THURSDAY: Partly cloudy, 20 to 30 km/h northwest wind, alpine temperature -8 C.

FRIDAY: Cloudy with snowfall, accumulation 5 cm, 20 to 50 km/h southwest wind, alpine temperature -5 C.

SATURDAY: Cloudy with snowfall, accumulation 10 to 15 cm, 40 km/h southwest wind, alpine temperature -5 C.

Avalanche Summary

No recent avalanches have been reported in the region.

Snowpack Summary

Wind from predominantly the southwest has redistributed last week's snow, resulting in wind slabs in exposed terrain features at and above treeline elevations. Wind-affected snow in exposed terrain and soft snow in sheltered terrain overly a hard melt-freeze crust below 1900 m.

Weak layers of feather surface hoar and/or sugary faceted grains may be found above a hard melt-freeze crust around 40 to 90 cm deep. Avalanches were reported on these layers on December 23 and 25.

The base of the snowpack consists of faceted grains and a hard melt-freeze crust from early-November. The most recent activity on this layer was on December 23.

Terrain and Travel

  • Watch for areas of hard wind slab on alpine features.
  • Avoid slopes that sound hollow or drum-like.
  • Be aware of the potential for large avalanches due to the presence of buried weak layers.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Regioni coperte