Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Non aggiornato — questo bollettino è scaduto 5 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Warming temperatures today should provide soft wet snow as daytime warming occurs in wind protected and lower elevation areas.  Strong winds could prevent or delay softening in wind exposed and higher elevation terrain.  Avalanches remain unlikely today. 

Avalanche Discussion

Normal caution

 

Sunny skies and warmer temperatures should provide favorable conditions for soft spring snow to form on wind protected and lower elevation areas today as daytime warming occurs.  Gale force NE winds overnight are forecasted to continue through this morning on exposed ridges and higher elevation terrain.  Wind exposed slopes at higher elevations may not soften at all or have delayed softening today depending on how quickly the winds decrease.  Thin high cloud cover may also delay some snow surface softening depending on location.  Today's combination of warming and wind should not create enough wet snow for significant wet-snow instabilities.

Make sure your group comes up with a plan before heading out into the backcountry that takes into account current conditions and your group's abilities.  Practice effective communication while in the field, carry avalanche rescue gear, and have a rescue plan in case something unexpected happens.  Practice safe travel techniques by only exposing one person at a time to avalanche terrain and regrouping out of avalanche terrain and run out zones.

Recent Observations:

  • Snowmelt has sped up over the last two weeks exposing more areas of bare ground on southerly aspects.
  • Highly variable snow surface conditions exist across the forecast area. Expect to encounter firm ice, rough wind-sculpted snow, firm wind-packed snow, shallow soft snow, breakable crusts, and melt-freeze snow.
  • A well-bonded and consolidated snowpack exists across nearly all aspects and elevations. Gradual near-surface faceting has created weak snow in the top portion of the snowpack on many wind-protected NW-N-NE aspects. A new snow load is needed on top of this developing weak layer before slab avalanche problems occur.

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