Confidence
Fair - Timing or intensity of solar radiation is uncertain
Weather Forecast
Overnight and Saturday: Mostly clear overnight with a mix of sun and cloud during the day. Cooler more seasonal temperatures with alpine lows about -10. Light to moderate Northwest winds and no precipitation.Sunday: Mix of sun and cloud with an area of warm air moving into alpine elevations pushed by moderate Southwest winds. Above freezing temperatures are expected in the Alpine.Monday: Continued warm air at higher elevations with light to moderate Southwest winds and no precipitation.
Avalanche Summary
Some pockets of wind slab were skier controlled up to size 1.5 and a recent report includes observation of a Size 2 storm slab that ran naturally in the past couple of days on a northeast facing alpine slope.
Snowpack Summary
New snow is expected to be poorly bonded, especially where it is sitting on a thin ice crust. The snowpack depth and structure is highly variable but generally shallow and faceted, which is unusual for the south coast. Recent warm temperatures have promoted strengthening, but weaknesses under the past week's storm snow remain a concern, particularly on wind-loaded slopes. A crust/facet combo buried near the end of November remains the upper/mid snowpack feature to watch. Basal depth hoar in shallow snowpack areas also remain a concern, particularly on south aspects.Early season riding hazards such as rocks, stumps and logs are lurking below the surface in many areas. In glaciated terrain open and poorly bridged crevasses are everywhere.
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.