Central Sierra Nevada

Problemi valanghivi

• 

  Wind Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alta quota
  • Limite del bosco
  • Sotto il limite del bosco

  Probabilità

  Likely

  Dimensione

  1–2

  Continued strong to gale force SW winds overnight and into this morning will add to the existing wind slabs that have formed yesterday.  Natural and human triggered wind slab avalanches have occurred over the last 2 days and are expected to remain unstable today in near and above treeline areas.  Rapid warming and intense solar radiation could further weaken existing wind slabs causing avalanches to fail.

  Look for signs such as blowing snow, new cornice formation, wind pillows, and snow surface clues to where wind slabs have formed.  Avoid steep wind loaded terrain and areas below cornices.

  

• 

  Loose Wet

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alta quota
  • Limite del bosco
  • Sotto il limite del bosco

  Probabilità

  Likely

  Dimensione

  1–2

  Intense solar radiation and increasing temperatures will cause rapid warming conditions this morning.  As the snow surface becomes wet and deep, widespread roller balls and pinwheels along with larger wet loose avalanches are expected on all aspects and elevations.  With some areas in the forecast region receiving up to 3 feet of storm snow in the last week, these wet loose avalanches could be large in size and entrain a lot of this recent storm snow.

  As the snow surface becomes wet and deep it's time to move off of avalanche terrain or change aspects.  Roller balls and pinwheels will be signs that the snow surface is wet and losing strength, with larger wet loose avalanches becoming more likely.