Banff Yoho Kootenay

Problèmes avalancheux

• 

  Persistent Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible

  Taille

  2–3

  The Valentines surface hoar is 70-150cm down. Field tests on Hwy 93N found hard results on this layer at treeline, where it was buried 1 meter deep. Triggering will be most likely from thinner snowpack areas.
• 

  Loose Wet

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible - Likely

  Taille

  1–3

  Freezing levels from 2300-2500m Sunday may initiate natural avalanche activity on solar aspects in the afternoon. Isolated activity on these aspects started late Sat. afternoon to size 2 in the Banff region.
• 

  Deep Persistent Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Unlikely - Possible

  Taille

  1–3

  Although difficult to initiate, we have seen some activity on the basal depth hoar over the last few days. These were initiated from thin snowpack areas, or "step down" avalanches. A recent sz. 3.5 natural on Mt. Lefroy stepped down to this layer.