Bollettino valanghe

Northwest Coastal

Dec 8 – 9, 2014Avalanche Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

Wed
Thu
Alta quota
4 · Forte
Limite del bosco
3 · Marcato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

A warm, wet and windy storm is expect increase danger and result in natural avalanche activity.

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–4
    Heavy storm snow is expected to initially bond poorly and overload deeper weaknesses in the snowpack. Extreme southerly winds could also create dense wind slabs well below ridge tops.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    Expect heavy loose wet sluffs in steep open terrain and in gullies.

Confidence

Fair - Due to the number of field observations

Weather Forecast

On Tuesday freezing levels are expected to rise as high as 1800 m while a Pacific frontal system brings another 20-40 mm of precipitation and strong southwesterly alpine winds. Wednesday is looking slightly drier and cooler with 5-10 mm of precipitation and freezing levels around 1500 m as the alpine winds shift to moderate southeasterlies. At this point, Thursday is looking totally dry as freezing levels drop down to 1300 m and winds ease off.

Avalanche Summary

No new avalanches were reported. A couple fresh natural wind slab avalanches were reported from an area northeast of Stewart on Friday. These slides were observed on west facing slopes near treeline, and were an average of 20 cm deep. Similar activity is possible throughout the region.

Snowpack Summary

Conditions vary significantly throughout the region. In general, the snowpack is shallow, facetted, and wind affected. Approximately  5-15 cm of recent warm storm snow sits on a mix of surface hoar or faceted snow in sheltered areas, and wind slab or ice crusts in exposed terrain. Strong NE-SE winds have created dense new wind slabs in alpine and exposed treeline areas on the leeward side of ridge crests and terrain features. The mid-November crust-facet layer is now 40-60 cm deep and recently gave easy to moderate shears in snowpack tests.

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