The 3 alternate possibilities presented in recent weeks are STILL in play. Rather than walk through them again, here are the charts:
Alternates 1 & 2
Alternate 3
The NYSE Tick analysis did a great job of signalling Friday's selloff on Thursday. Note that the indicator declined steadily on Thursday despite the rally earlier in the day, i.e. it diverged. This chart has been getting posted twice a day here.