Bollettino valanghe

Kootenay Boundary

Jan 3 – 4, 2017Avalanche Canada
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Archiviato · scaduto 10 years ago

Pericolo valanghe

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

In sintesi

Cold north winds have been blowing. Be on the watch for wind slabs, particularly on southerly aspects

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Wind slabs have been forming on mainly southwest to north aspects behind exposed terrain features. Slabs found on south aspect slopes could become more unstable when the sun is out.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

The arctic outbreak continues with cold temperatures and no snow until Sunday at the earliest. WEDNESDAY: Dry and sunny. Winds light north/northeasterly 5-15 km/h. Temperatures between -18 and -26 Celcius!THURSDAY: A mix of sun and cloud. Wind light west. Temperatures between -13 and -20 Celcius. No precipitation. FRIDAY: Cloudy with sunny periods. Wind becoming southwesterly 5-15 km/h. Temperatures between -12 and -20 Celcius. No precipitation.

Avalanche Summary

We've had reports of several natural and skier-triggered windslabs (Size 1.5-2) yesterday in the backcountry near Nelson. Aspects were southwest through north at treeline and in the alpine.

Snowpack Summary

This region saw 30-60 cm new snow during last week's storms (with more in the eastern areas and less in the west). The new snow sits over a weak layer buried on Boxing Day that was initially reactive but now appears to have gained strength. Recent winds switched from mainly southwesterly to northerly, "reverse loading" areas and causing windslabs. Slightly lower in the snowpack is an interface buried mid-December, now down 40-100 cm. This layer appears to be well bonded in many parts of the region but was reactive for a while last week west of Trail and Castlegar where preserved surface hoar was thought to be responsible for four small (but surprising) skier trigger avalanches. It will be important to continue to monitor this layer for further signs of reactivity.

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