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Avalanche Forecast

Archived

Mar 6th, 2023–Mar 7th, 2023

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Sunny skies and decent snow quality is making for memorable days in the mountains. The hazard may have dropped slightly, but triggering a large avalanche remains possible.

Confidence

Moderate

Avalanche Summary

On the highway corridor, several natural avalanches occurred Sunday evening, size 2-3.0 on steep South aspects.

A suspected skier triggered sz 2.0 in Lone Pine on Sunday. No perceived involvement.

Snowpack Summary

A crust has likely formed on steep solar aspects. Wind slab exists in the alpine and exposed areas at tree line. 40-60cm of settled snow overlies a layer of decomposing stellars (large new snow crystals), a crust on solar aspects, or a thin layer of facets.

The snowpack is generally strong, however the deep persistent weakness of rounding facets and a decomposed crust remains at the bottom of the snowpack.

Weather Summary

Tuesday will have a mix of sun and cloud with a chance of isolated flurries. Alpine temps will range from -8 to -15 with a freezing level of 1100m. Ridgetop winds will be light from the South.

Similar weather for the remainder of the week.

Terrain and Travel Advice

  • Start with conservative lines and watch for clues of instability.
  • Carefully evaluate steep lines for wind slabs.
  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.
  • Cornices become weak with daytime heating or solar exposure.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.