Total snowpack height at the deepest part of the slab was 240 cm. The right flank was 140 cm. The left flank was 160 cm.
Structure in the deepest part of the slab was: top down:
15 cm of fist,
25 cm of 4 finger,
20 cm of 1 finger,
10 cm of knife,
FRACTURE at 160 cm down in 10 cm of fist to 4 finger, 1.5 mm facets
(Slab 80 to 85 cm deep uniformly throughout the slide).
The snow on the flanks was much weaker and obviously thinner.
Failure was initially in late January facets, stepping down to early January facets.
OF NOTE: the left flank appeared to indicate that the initial failure was here, and 45 cm down at the interface of all of the new snow since last Wednesday, and it then propagated back towards the Millicent Chair to the NE, and then stepped down the 80 to 85 cm depth. This 80 cm depth appears to be housing the early January facets in this location. OF NOTE: There appeared to be another small pocket that sympathetically pulled out just below the cliff bands beyond the tree stand on the rider's left flank. There were still extensive cracks and this pocket appeared to be about 45 feet wide. it did not run far, as the slope angle lets up significantly below this rock/cliff. Structural tests reported by Brighton Patrol post slide indicated an extremely weak snow interface at the right flank at the previously mentioned 45 cm depth. Score ECTP2, Q1. Also of note, the weak layer 80 cm down on the left flank was very loose and totally fist hardness, and significantly weaker than in the middle of the slab (where the total depth was 80 cm thicker). Specifically, the entire structure on the left flank was at least one step softer/less hard/different than the structure reported above in the deepest part of the slab.
Finally, this observation was taken at 1630 and the majority of the crown face was already filled in with the new snow and transport since the incident. Subsequently there is most likely a significantly larger amount of load now on adjacent slopes in this area above and to the SW as this part of the Brighton Back Bowl system wraps around to the Stupid Chute area