Central Sierra Nevada

Lawinenprobleme

• 

  Loose Wet

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Hochgebirge
  • Waldgrenze
  • Unterhalb der Waldgrenze

  Wahrscheinlichkeit

  Possible

  Größe

  1

  Air temperatures were really warm and well above freezing last night. A weak snow surface refreeze driven from radiational cooling of the snowpack is expected to have occurred under mostly clear skies. The relatively thin and superficial melt-freeze crust is expected to be thickest on open slopes and thinner to possibly nonexistent under forest canopy. Once this surface crust melts away the residual deep wet snow below it will be exposed. This exposed deep wet snow will be prone to loose wet avalanches on all aspects and at all elevations. Avalanche size is expected at D1 to D2, depending on what the terrain is capable of producing.

  Avalanche problems will develop quickest on E-SE-S aspects, followed by a relatively slower onset on the other aspects. This avalanche problem can be avoided by choosing not to travel in or below avalanche terrain once the surface crust has melted to the point that it is no longer supportable. Use aspect and slope angle to your advantage.

• 

  Glide Cracks

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Hochgebirge
  • Waldgrenze
  • Unterhalb der Waldgrenze

  Wahrscheinlichkeit

  Possible

  Größe

  1

  Cornices that exist along many ridgelines will continue to collapse today. Large falling blocks of snow could injure a person on their own and may entrain more wet snow or trigger a loose wet avalanche when they impact the slope below.

  Cornices frequently break farther back from their edges than expected. Cornices can also fail at unexpected times. Stay far back from the edges of cornices while on ridgetops and avoid travel underneath cornices.