Jasper

Problèmes avalancheux

• 

  Wind Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible

  Taille

  1–2

  Soft slabs 10-50cm overlay a buried surface hoar layer. A shift to winds from the NE may create slabs in areas that do not normally get high snow load. Today, a size 2 slab was observed on a convex roll at treeline on this layer.
• 

  Deep Persistent Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Unlikely - Possible

  Taille

  2–4

  Increased loads with wind or new snow may awaken this instability. A small loose avalanche stepped down to this layer on a cross loaded gully producing a size 2 avalanche with a crown depth ranging from 30 - 150cm.