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

  Strong to gale force SW winds yesterday and last night have created wind slabs on NW-N-NE-E-SE aspects in near and above treeline terrain.  4 to 15'' of new snow has fallen throughout the area and has been available for wind transport.  Winds have shifted to the SE this morning and are forecasted to be light through today.  Wind slabs that were formed yesterday could still be reactive to human triggering today.

  Signs of wind slab avalanche problems will include: recent wind slab avalanches, new cornices, wind pillows, shooting cracks in wind loaded terrain, and snow surface scouring.  Newly formed wind slabs could be multiple feet deep in areas that received the higher end snow totals yesterday.

• 

  Wet Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alpin
  • Limite forestière
  • Sous la limite forestière

  Probabilité

  Possible

  Taille

  1

  Recent storm snow from yesterday is mostly right side up with the storm starting out warm and ending colder.  Winds decreased into the early morning hours as snowfall continued.  In steep below treeline terrain, loose dry avalanches will be possible today.  These are generally expected to be small surface sloughs, but could be large enough to take a backcountry user for a ride.  Loose dry avalanches could run fast and be especially problematic in areas with secondary exposure, terrain traps, or complex terrain. 

  In areas where sloughing is occurring, use good terrain management techniques to limit exposure to other obstacles such as rocks, cliffs, or trees.