Eastside Region

Problèmes avalancheux

• 

  Wind Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Very Likely

  Taille

  2–3

  Strong to extreme southwest winds are expected to continue drifting new snow through at least this afternoon. Expect very large, natural avalanches on wind loaded slopes. These avalanches have the potential to step down into buried weak layers, producing even bigger avalanches that may propagate across slopes and run to valley bottoms. Travel in and beneath avalanche terrain is not recommended. 

  

• 

  Storm Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Likely

  Taille

  1.5–2.5

  We've received up to 50" of snow and 6.5" of snow water equivalent in favored areas as of 5:30 am today. We expect heavy snowfall to continue throughout the morning before tapering later this afternoon. The new snow will remain unstable until loading rates decrease. Even sheltered slopes could be dangerous. Because we have buried weak layers in our snowpack, storm slab avalanches have the potential to break wider than expected. A smaller storm slab may break into buried weak layers, producing a large persistent slab avalanche. Travel in and below avalanche terrain is not recommended. 

  

• 

  Persistent Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Likely

  Taille

  2–4

  Buried weak layers have shown signs of instability since the last loading event. We can expect to see very large natural avalanches breaking deeper in the snowpack as loading by new snow and wind continues. In some areas, these avalanches could break near the ground, propagate across an entire slope, and run thousands of feet downhill. They will be unsurvivable. Persistent slab avalanches are difficult to predict, and can be triggered from terrain you might normally think of as safe. Travel in and beneath avalanche terrain is not recommended.