Microwave-Sinclair-North Bulkley-South Bulkley-Telkwa — Bulletin d'avalanche

On Wednesday in the Seaton area, our field team saw evidence of a large (size 2.5) naturally triggered persistent slab avalanche on a south facing slope at 1800 m. It ran across the normal trail, and likely occurred on the weekend.This continues the trend of persistent slab avalanches from late last week, including a remotely triggered size 3.With little change in the weather, we expect that avalanches like these remain possible on all aspects.

10-30 cm of recent snow is settling over a strong, supportive crust that is expected on the surface on all aspects at treeline and on all but north-facing terrain in the alpine.A possible period of moderate northeast wind may be loading this loose snow onto crusty southwest facing slopes.A layer of weak, sugary snow over a thick crust is buried 100 to 200 cm and continues to produce large, surprising avalanches.