Size 3 DPS, Remote Triggered

La qualité du hors-piste était:

Incroyable

Les conditions de neige étaient :

• Poudreuse abondante
• Lourde
• Poudreuse

Nous avons parcouru:

• Forêt dense

La journée était:

• De tempête

Conditions d'avalanche

• Avalanches de plaque datant d'aujourd'hui ou d'hier.
• 30 cm + de neige fraîche ou transport important de neige par le vent ou pluie au cours des dernières 48 heures

Skied near Pedley Pass yesterday (Wednesday). We were surprised to find 40cm of storm snow at treeline tapering to 20cm at 1700m. This was overlying a ~5cm breakable crust on north aspects. There was also large graupel near the bottom of the storm snow. Moderate NW winds were forming wind slabs near ridgetop. A storm slab was also forming throughout the day in sheltered areas. The storm snow appeared to be bonding poorly to the crust/graupel.

While skinning along a ridge at 2350m we remotely triggered a size 3 deep persistent slab from 5m away, on a north aspect (see avalanche tab). We couldn’t see the whole start zone due to poor visibility, but we suspect it propagated the full width of the feature. It was a triggered from a thin spot (~60cm deep).

This was a big surprise as we were expecting only surface instabilities and were admittedly in too much of a spring mindset. A good reminder of the unpredictability of the deep persistent slab problem, and that a winter snowpack can still be found at upper elevations on north aspects.