Banff Yoho Kootenay

Problèmes avalancheux

• 

  Wind Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible - Likely

  Taille

  1–2

  Moderate winds this week have also created thin, but stiffer wind slab conditions 25-35 cm deep on ridgetop lee terrain. These have been seen to step down to the Valentine layer. Skiers on Fairview triggered a large slide yesterday, lucky to survive.
• 

  Persistent Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Likely

  Taille

  2–3

  Snow depths over the Valentines surface hoar and suncrust on steep solar aspects range from 20cm E of the Divide, to over 45cm at Sunshine and Yoho. Where the wind has stiffened these slabs, skiers have triggered big enough slides to bury them.
• 

  Deep Persistent Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible

  Taille

  1–2

  In the Lake Louise backcountry today, we encountered a weak, shallow snowpack. Tests done here showed hard results, but sudden collapse, on the basal facets. The slides reported yesterday on Bosworth and Fairview both had stepped down to ground.