Bollettino valanghe

Northwest Inland

Mar 9 – 10, 2016Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 11 years ago

Pericolo valanghe

Fri
Sat
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Very strong winds are expected with the approaching weather system. These winds could also push more snow into the Inland region than initially expected. As such, danger is elevated for Thursday.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–4
    New snow combined with very strong and shifting winds will create deep and dense wind slabs in exposed terrain on a variety of aspects.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    3–6
    This next system could deliver a big enough punch to trigger very large avalanches on weaknesses near the bottom of the snowpack. Steer clear of big, steep slopes with variable snow depth.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Thursday

Weather Forecast

THURSDAY: Periods of snow – 10-20 cm. The freezing level peaks near 1400 m but gradually lowers to valley bottom by the end of the day. Winds are strong from the W-SW. FRIDAY: Cloudy with sunny breaks. The freezing level is around 1200 m and winds are light to moderate from the SE. SATURDAY: Cloudy with sunny breaks. The freezing level is around 1000-1200 m and winds are light from the SE.

Avalanche Summary

There were no new reports of avalanches on Tuesday. A couple natural size 2 wind slabs were observed on immediate lee alpine slopes on Monday. One size 3 natural storm slab was observed in the Southwest corner of the region on Sunday. This slide probably occurred 1-2 days earlier. It released on a northeast aspect in the alpine. There were a handful of large persistent slab avalanches triggered on basal facets in the mountains north of Kispiox last week.

Snowpack Summary

Roughly 20-40 cm of snow has fallen in the past week, with the highest accumulations occurring in the southwest of the region. Strong to extreme ridgetop winds have shifted the new snow into hard or soft wind slabs in exposed terrain, adding to an ongoing wind slab problem. A layer of surface hoar from early January can be found in isolated locations between 60 and 140 cm down. There hasn't been any activity reported on this layer for a couple of weeks now and it is becoming less of a concern. In shallower areas the snowpack sits on a weak base layer of facetted snow. Recently, this layer has been active in the north of the region, responsible for several large avalanches in unsupported alpine terrain.

Regioni coperte