Bollettino valanghe

Cariboos

Jan 24 – 25, 2013Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 14 years ago

Pericolo valanghe

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

In sintesi

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–6
    The load from the storm snow could awaken the early January surface hoar layer. Distribution is patchy but has been more reactive below treeline.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–5
    Expect to find thick storm slabs on lee ridges of W-SW winds in the alpine and at treeline and softslabs and loose snow in sheltered areas. We suspect that these layers will not bond very well with the old surface.

Confidence

Poor - Intensity of incoming weather is uncertain

Weather Forecast

Thursday night and Friday: Another frontal system is moving inland from the coast. Light precipitation is expected to start overnight and go until the afternoon Friday for a total of 10 to 20 mm. in the wettest zones. Winds are expected to be strong from the SW-W in the alpine and temperatures remaining cool (-7 C) and freezing level staying at the surface. Saturday: Trace to light precipitation amounts, lighter W winds and similar temperatures. Sunday: Similar unsettled conditions providing trace to light precipitation, cool temperatures with light SW winds.

Avalanche Summary

Storm snow was already sluffing far and fast yesterday. We expect more of that happened today and also the storm slabs probably producing some avalanches too.

Snowpack Summary

More snow will add on to the10 to 30 cm that fell yesterday with moderate winds from the W-SW (more snow fell in the S part of the region). New windslabs in the alpine and at treeline under lee ridgetops will grow thicker and their bond to the old surfaces will be weak for a certain time. Soft slabs and loose snow is expected to slide very easily on the January 23th surface hoar layer that is located in shaded-sheltered areas below treeline and also on the buried suncrust found on South facing slopes. This significant new load might also awake the early January surface hoar weak layer that will be sitting down 80 cm in sheltered areas below treeline. Under these concerning layers, a strong mid-pack overlies a weak facet/crust layer near the base of the snowpack, which is now considered inactive.

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