Bollettino valanghe

South Columbia

Mar 17 – 18, 2013Avalanche Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

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

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–4
    New snow on Saturday night and continued winds have created new wind slabs. Watch for loading on a variety of aspects due to variable wind directions.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–6
    Recent stormy weather has formed large and potentially weak cornices. Cornice falls may be highly destructive, and could also trigger large avalanches on the slope below.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–6
    New snow accumulations have added load to an existing storm slab problem which produced destructive natural avalanches prior to the weekend.  Current reactivity is most likely in areas where buried surface hoar exists.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Monday: Light snowfall / Moderate to strong northwest winds / Freezing level at 1100mTuesday: Generally clear skies / Light southwest winds / Freezing level at 1300mWednesday: Moderate snowfall / Moderate southwest winds / Freezing level at 1500m

Avalanche Summary

No new natural activity was observed on Saturday; however, observations were somewhat limited. Having said that, numerous size 1.5 avalanches were triggered on various aspects between 2100m and 2300m by machines or by humans, one of which was remotely triggered from 10m away. In all cases the March 10 interface was the culprit. I would expect a new round of wind slab activity in response to new snow and wind on Saturday night.

Snowpack Summary

Generally moderate amounts of new snow fell on Saturday night and have have been distributed into deeper windslabs in lee terrain. These new accumulations overlie a deep and cohesive storm slab which formed last week with strong winds, very heavy snowfall and warm temperatures. This deep storm slab produced widespread and destructive avalanches in the region and may take some time to fully stabilize as it overlies weak surface hoar buried on March 10th. At lower elevations heavy rain penetrated the snowpack; however, subsequent cooling has helped strengthen the snow.Deeper weaknesses in the snowpack have now become unlikely to trigger.Widespread cornice development has also taken place, and cornices are reported to be very large and weak.

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