Bulletin d’avalanche

South Coast Inland

Mar 2, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Snowfall amounts may vary throughout the region. In the Cascasdes, heavy snow is expected to result in HIGH danger, while further north, much drier conditions are expected to result in slightly lower danger.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–4
    A possible pattern of persistent slab avalanche activity has emerged in the northern part of the region. Recreating in the mountains north of Pemberton suggests using more conservative terrain with additional caution on northerly aspects.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Watch for wind slabs in the lee of exposed, higher elevation terrain features. Areas with higher amounts of storm snow (e.g. Coquihalla), are likely to develop more widespread storm slabs on steeper terrain features (even where wind protected).

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

THURSDAY: 5 cm (Duffy) to 20 cm (Coquihalla) by Thursday evening. Moderate SW winds. Warming with treeline temperatures a getting close to zero.FRIDAY: Another 20 cm possible (Coquihalla) but dry further north (Duffy). Moderate SW winds. Temperatures starting to cool a few degrees.SATURDAY: A mix of sun and cloud with scattered flurries bring as much as 5-10 cm to some areas. Freezing levels around 1000 m and light southwesterly winds.

Avalanche Summary

No new avalanches have been reported since Monday, when only one slab avalanche reported: a size 2 on a South aspect in the alpine. Some loose dry sluffs reported from steep gullied terrain. Avalanche activity will increase with forecast snow, wind, and warming temperatures.

Snowpack Summary

Another 15-25 cm of fresh snow adds to the 10-35 cm of snow from the weekend that is bonding poorly to facets and buried surface hoar, as well as crust on previously sun-exposed slopes. Reports from the Duffy Lake area on Sunday include easy whumphing and cracking at ridge top. The widespread mid-February crust can be found down 40-80cm and seems to be well-bonded, although is reportedly weakening. In the northern part of the region, a facet/surface hoar weakness buried early February, is now down around a metre and remains reactive in snowpack tests. It is also suspected as the failure plane in at least one of two recent large persistent slab avalanches in the Hurley Pass area. In the Cascades (e.g. Coquihalla), the mid and lower snowpack are well settled and strong. Forecast new snow is likely to arrive with strong SW winds and warming temperatures.

Régions couvertes