Open meadow 33 degrees steep on a SE facing slope collapsed with a large whumph! This occurred at 4400 feet. We reassessed. We dug and performed an ECT.
ECT20 resistant planar on a solar crust 75 cm down.
Using our pit as a test slope we pushed from above with skis on and could easily get collapsing and propagation on this layer with stubborn shooting cracks extending 10 feet.
We skied on shadier terrain where we couldn’t find the solar crust.