Bulletin d’avalanche

South Coast Inland

Jan 7, 2019Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Monday brings a short break in the stormy weather, but storm slabs are still likely to be encountered and could be reactive to human triggering, especially in wind loaded areas.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Recent new snow and strong to extreme southerly winds have promoted rapid cornice growth.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5
    Storm slabs have formed from heavy snowfall and strong winds. Slabs will likely be the most reactive in wind loaded areas.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Weather Forecast

SUNDAY NIGHT - Cloudy with clear periods and isolated flurries / southwest winds, 40-60 km/h / alpine low temperature near -10MONDAY - Cloudy with sunny periods / west winds, 40-50 km/h / alpine high temperature near -8TUESDAY - A mix of sun and cloud  / southeast winds, 15-20 km/h / alpine high temperature near -5 WEDNESDAY - Snow, 5-10 cm / southeast winds, 20-40 km/h / alpine high temperature near -5

Avalanche Summary

On Saturday, one natural size 2 avalanche was reported in the region on an east to north aspect at 1900 m.A natural avalanche cycle was reported north of Pemberton on Friday. Numerous natural avalanches size 3-4 were reported. An avalanche fatality occurred near Pemberton on Thursday, January 3. See the Preliminary Incident Report here. On Thursday, natural avalanches size 2-3 avalanches were reported north of Pemberton. Near the Coquihalla, wet avalanches size 2-2.5 were reported.

Snowpack Summary

50-100 cm of storm snow has accumulated throughout the region since January 1. Strong to extreme winds will have promoted slab formation and cornice growth. The recent storm snow sits on two weak layers that formed in mid and late December. These layers consists of surface hoar (feathery crystals) and/or a sun crust on steep south facing slopes. The surface hoar is reported to be most prominent in the southern part of the region in areas like the Coquihalla Summit and Manning Park, on north and east aspects at treeline.In the northern portion of the region, a deeper weak layer composed of facets (sugary snow) and/or surface hoar is buried 100 to 150 cm. There have been no reports of avalanche activity on this layer for the past week, but field observations suggest that avalanches may still be possible on this layer with a heavy load such as a cornice fall.

Régions couvertes