Bollettino valanghe

Waterton Lakes

Dec 28 – 31, 2016Parks Canada
Vedi sulla mappa
Archiviato · scaduto 10 years ago

Pericolo valanghe

Wed
Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

You guessed it, snowfall and then extreme winds, and then snowfall. Watch for Wind Slabs low on the slope. The possibility  also still exists to trigger persistent weaknesses in the mid to lower snowpack.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    These are more widespread than usual, existing on most aspects and elevations due to the intensity of previous winds. They will be hard to spot under new snowfall. New Wind Slabs will build with forecast Strong Westerlies on Monday.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3
    Nearby operations have reported these failing in the middle of the snowpack, and in some cases stepping down to ground. They are most likely to be triggered in thin rocky areas, which are more widespread in the Eastern areas of the Park.

Weather Forecast

Wednesday: Strong Westerly wind, flurries, treeline highs of -12.Thursday: Strong West wind trending to Extreme, light snowfall possible in the afternoon, treeline highs of -7.Friday: Mix of sun and cloud, decreasing wind, treeline highs of -10.

Snowpack Summary

New snowfall is burying a variable snowpack with several layers of wind slab (from extreme West winds) at all elevations. In deeper snowpack areas, hard persistent slabs (from earlier SW winds) sit on a faceted mid and lower snowpack. In thin snowpack areas, several layers of hard wind slab are sitting on weak, large, developing depth hoar.

Avalanche Summary

Explosive control work at neighboring avalanche operations has been producing large avalanches in wind exposed terrain, especially in areas that were shallow prior to recent wind loading from the west.Shooting cracks and whoomphing were observed in pockets of hard wind slab over depth hoar in Eastern (shallow snowpack) areas.

Confidence

Regioni coperte