Crown profile on approx 30 hr old hard wind slab natural avalanche. Avalanche occurred at treeline. Pit dug on far climber's left end of crown. ECTP failed 11 cm deeper into the weak layer than the avalanche bed surface. I interpreted this to mean that the hard slab is bonding to the weak layer. 2mECT scored 2mECTN breaking 70cm across the 2m column.