Bollettino valanghe

Northwest Coastal

Apr 6 – 7, 2017Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 9 years ago

Pericolo valanghe

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

In sintesi

Exposed terrain has been walloped by strong winds. Watch for cornices and wind slabs at higher elevations.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    Very strong winds on Tuesday night and Wednesday likely formed reactive wind slabs in the lee of exposed terrain.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3
    Large cornices may become weak with daytime warming and have potential to trigger slabs on the slopes below.

Confidence

High -

Weather Forecast

FRIDAY: Cloudy with sunny periods and isolated flurries, moderate southeast wind, freezing level up to 1300 m after an overnight freeze.SATURDAY: 5-10 cm of new snow, light southeast wind, freezing level around 1300 m.SUNDAY: Cloudy with light flurries, moderate south wind, freezing level around 1200 m.

Avalanche Summary

Several natural and explosive triggered wind slabs were reported on Wednesday in north and west alpine features (up to size 2.5). Several avalanches were triggered by cornice falls earlier in the week, including one size 2.5 persistent slab avalanche on the February weak layer. A snowmobiler had a close call with a cornice fall on the weekend at South Douglas (click here for MIN report).

Snowpack Summary

Touchy wind slabs may still exist at higher elevations, as Wednesday's storm delivered 15-20 cm of snow above 1000 m with strong to extreme winds. Extensive wind affect is expected in exposed terrain. An overnight freeze will likely form a crust at lower elevations that will deteriorate with the heat of the day. A weak layer of facets and crusts is buried 100-150 cm deep. The layer has been unreactive recently, but a heavy trigger such as a cornice fall or intense warming may still be able to trigger it.

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