Stability will deteriorate quickly when the sun comes out so be aware of overhead terrain and the aspect. Early starts and finishes are key. Good skiing is being found on northern aspects!
Confidence
Moderate - Timing or intensity of solar radiation is uncertain on Friday
Weather Forecast
Friday looks like a carbon copy of Thursday with a mix of sun and cloud, generally light NW winds and freezing levels around 2200m. Important to note that when the sun comes out the solar radiation is intense and the stablity on the solar aspects will deteriorate quickly. Keep an eye on the weather and overhead terrain as you travel.
Avalanche Summary
Some loose sluffing up to sz 1.5 out of steep solar terrain when the sun came out but otherwise, no new natural activity was observed.
Snowpack Summary
Convective squalls continue to give us 5-10cm/day but these amount can vary by the drainage and also taper rapidly at lower elevations. Windslabs are being observed in Alpine areas along ridgelines and in open terrain. These slabs are 20-30cm thick and are reactive to a skiers weight. At treeline the windslab are very isolated and more stubborn to trigger. Moist snow was observed on Solar aspects up to 2600m and on all aspects below 2100m. Expect to encounter crusts in the upper snowpack on all aspects at lower elevations and on solar aspects up to 2600m. Despite no recent avalanche activity on the deeper weak layers, we consider the consequences of a large avalanche before committing to a slope.
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.
Cornices
Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.
Deep Persistent Slabs
Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.