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

  Possible

  Dimensione

  2

  We received some additional snow overnight with increased and changing winds.  Wind slab avalanches could be possible today on NE-E-SE-S-SW-W aspects near and above treeline.  Winds have been variable depending on location, anywhere from the NW-N-NE with speeds ranging from 20 to 30mph with gusts up to 50mph.  Over the last 24 hours, more snow accumulation has occurred north of Hwy. 50 and on the Eastern side of the forecast area.  These areas with more available snow for wind transport and winds strong enough to move snow will be of most concern.   

  Be aware of highly localized avalanche conditions today and avoid potentially unstable wind slabs where they have formed. Use clues such as blowing snow, recent avalanche activity, cornice formations, wind pillows, snow surface scouring, and human triggered snow surface cracking to help identify areas to avoid.

• 

  Loose Wet

  N

  NE

  E

  SE

  S

  SW

  W

  NW

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

  Probabilità

  Unlikely

  Dimensione

  1

  There is some uncertainty as to how much sun we will see today.  If sun breaks do develop and we receive large amounts of solar radiation, loose wet avalanches could occur on E-SE-S-SW-W aspects.

  Look for small surface instabilities like roller balls, pinwheels, or point releases. Once the surface snow becomes wet it's time to change aspects and move off and away from slopes that are 35 degrees or steeper. Terrain traps like gullies, creeks, and cliffs can greatly increase the risk of any size loose wet avalanches.