Central Sierra Nevada

Problèmes avalancheux

• 

  Wind Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible

  Taille

  1–2

  Continued snow and SW winds will keep wind slab avalanches possible for today.  SW winds have varied throughout this storm cycle over the last few days and increased in speed overnight along the higher ridges and peaks.  Moderate to large amounts of snow are available for wind transport where winds have increased.  Large cornices could continue to be fragile and exist above slopes where these wind slabs have formed.  Human triggered wind slab avalanches are possible today and could be large in size.

  Look for evidence of previous or current wind transport and scouring.  Blowing snow, cornice development, and snow surface scouring will be clues as to where these wind slabs may exist.  Give wide safety margins to steep wind loaded slopes and areas below large cornices.

  

• 

  Loose Dry

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible

  Taille

  1–1.5

  Low density snow and cold temperatures will continue dry loose sluffing on steeper slopes.  These sluffs could run long distances and entrain more snow on bigger terrain.  In some areas, the recent storm snow could slide on the previous firm old snow surface crust.  These sluffs are expected to be mostly small in size, but could be large enough to knock a person over or push them into rocks, cliffs, or terrain traps.