It certainly looked like a breakout, at least for today, but it would have been more convincing if the volumes had not remained thin. As such it looked like a short squeeze engineered by the wiseguys ahead of the FOMC meeting.
SP 500
NDX
"As it was in the days of Noah, so shall it be with the coming of the Son of man. In the days before the flood, they were eating and drinking, marrying and being given in marriage, even to that very day in which Noah entered into the ark. They did not know what was happening, even as the flood came and swept them all away." Matthew 24:37-39