
On Sunday, a solo rider triggered this persistent slab avalanche from below and was caught, carried, but walked away clean -- Check it out, more deets here.
Here's the wind up... it's not the snow we're riding in that's the problem, it's the snow we're riding on. Remember, early season snow turned persistent weak, sugary layer now lurks 2-4 feet beneath a supportable, cohesive slab, and now much of our pack is tied together by a Christmas Eve rain crust with seemingly harmless, low density snow on top. Now the pitch... adding a curve ball to the mix, the snowpack feels bomber under our skis, board, or sled but it's not. In fact, all we need to do is find a shallow spot, like around a bush or rock where we can punch through the slab, irritate the weak layer and collapse the slope, and now the entire roof is crashing down on us. See this setup for yourself as the proof is in the structural powder-pudding recipe. Pull out your shovel or trench your track down and you'll for sure see a dense, strong slab sitting above weak, old, faceted snow near the ground.
I'm taking Andy's advice from his forecast earlier this week and paying particular attention to, and avoiding heavily wind-loaded slopes that have a very dense and supportable slab sitting atop, early season, weak layers. Persistent slab's are tricky and aren't manageable with ski or side-hill sled cuts. Instead, avoidance is the go-to tool.
JC and I stomped around Campbell Hollow yesterday and found an intriguing snowpack... weak, faceted snow near the ground is still the main player.