Surprisingly good skiing in sheltered alpine & treeline areas today. Near the divide seems to have the deepest snow. There were some small sluffs today in steep terrain. These could be a problem in larger terrain features.
Weather Forecast
The winds will calm down a little more over the next few days. Tomorrow will see 35km/hr SW winds at ridgetop. Only trace amounts of snow in the next 24-36 hours, Temperatures will be consistent at -10 in the alpine. The three day outlook is consistent with scattered cloud and SW wind.
Avalanche Summary
A few small skier triggered loose dry sluffs in steep terrain.
Snowpack Summary
In the alpine the winds have blown the available snow around and in some places exposed the crust, and in others, lee areas have been filled in. From our experiences, the Nov 26th crust is widespread up to 2600m. We haven't been above that elevation, but its thought the crust extends well into the alpine. The blown in areas are wind slabs of various densities. Some areas are very soft slabs, and others are dense and more reactive to skier triggering. Treeline is a similar story, however the crust is consistently buried below 50cm of snow. Total snow height at treeline is 130-140cm The crust is very solid and currently bridging the weaker lower layers. Interestingly, today's snow pit had moist snow from ground up to the base of the November crusts.
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.
Persistent Slabs
Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.