Bulletin d’avalanche

North Columbia

Dec 6, 2017Avalanche Canada
Voir sur la carte
Archivé · expiré 9 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
Ouvrir la carte complète

Points saillants

Intense warming is on the way and it's tricky to predict how it will impact the snow. Make conservative terrain choices and avoid sun exposed slopes.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Storm slabs will become touchy as the snow warms up, especially on steep south-facing slopes. Also watch for wind-loaded slopes around ridges and gullies.

Confidence

Moderate - Freezing levels are uncertain on Wednesday

Weather Forecast

WEDNESDAY: Sunny with valley cloud in the morning, light northwest wind, inversion forming with alpine temperatures reaching -2 C.THURSDAY: Sunny with valley cloud, light wind, inversion with freezing level up to 3000 m.FRIDAY: Sunny with valley cloud, light wind, inversion with freezing level up to 2700 m.

Avalanche Summary

On Tuesday, explosive avalanche control in the Monashees produced a few size 1.5 slabs running on the November crust on northwest-facing slopes at treeline. A large size 3 natural avalanche was reported on a steep north-facing alpine face in the Selkirks. The failure layer is unknown, but it was likely an early season crust. Some sluffing from steep sun-exposed slopes was also reported.

Snowpack Summary

The snowpack is about to experience a big change with a week of warm sunny weather ahead. Intense warming is expected on steep south-facing slopes, while dry snow may persist on north-facing slopes. Snow from last week's storms has been redistributed into fresh wind slabs by northwest winds. Roughly 40-80 cm of recent snow sits above crusts from the warm weather in late November. Most reports suggest the snow is bonding to the crusts so far, but there's potential for this layer to become reactive with the intense warming. Snow depths decrease rapidly below treeline, where the primary hazards are rocks, stumps, and open creeks.

Régions couvertes