Bollettino valanghe

South Coast Inland

Feb 23, 2017Avalanche Canada
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Archiviato · scaduto 10 years ago

Pericolo valanghe

Thu
Fri
Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole

In sintesi

Wind slabs at upper elevations remain a concern. Don't let the improving conditions tempt you into unsupported terrain.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Maintain caution around wind slabs in wind-exposed, higher elevation terrain. These are likely to remain sensitive to human triggering over the short term.

Confidence

Moderate -

Weather Forecast

Thursday: A mix of sun and cloud. Winds light from the northwest. Freezing level around 700 metres with alpine temperatures of -9 in the north of the region, closer to -5 in the south. Friday: Cloudy with sunny periods and isolated flurries bringing a trace of new snow. Winds light from the northeast. Freezing level around 700 metres with alpine temperatures of -10 in the north of the region, closer to -6 in the south. Saturday: Cloudy with sunny periods and isolated flurries bringing a trace of new snow. Winds moderate from the southwest. Freezing level around 700 metres with alpine temperatures of 10 in the north of the region, closer to -6 in the south.

Avalanche Summary

Ski cutting continued to produce Size 1 wind slab releases in the region on Tuesday. As on Monday, natural sluffing was again observed from steep sun exposed slopes, with deposits reaching up to Size 1.5. A natural cornice failure also triggered a Size 2.5 wind slab in the Pemberton Icefield area, immediately adjacent to the northern part of the South Coast Inland region. Several other natural cornice releases to Size 2 were also observed on north aspects in the alpine, however these failed to trigger slabs below.Although the report is older, a Size 3 persistent slab avalanche was observed up the Hurley at treeline elevation on Friday. It likely failed on the weak layer from early February.For Thursday, lingering wind slabs are the main concern. Look for these in immediately leeward features on northerly aspects in exposed terrain.

Snowpack Summary

At higher elevations, 10-30 cm of recent snow overlies the widespread mid-February crust layer. Recent reports suggest this snow is well bonded to the crust. Recent cornice and wind slab releases have been reported in high north facing alpine terrain, but both cornices and wind slabs are expected to have gained considerable strength over the past couple days of colder temperatures. The potential for human triggering wind slabs will remain a concern over the short term. In the north of the region, a facet/surface hoar layer from early February down 60-100 cm was recently reactive in snowpack tests but would be very difficult to trigger without something heavy like a cornice fall or smaller avalanche stepping down. In the south of the region, the mid and lower snowpack are well settled and strong.

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