NYSE:
Points up: 91.7%
Volume: 81.7%
S&P500:
Points up 95%
Volume Up 87%
Close, but no cigar.
If tomorrow is an 80+% day, the back to back would indicate some staying power.
A reversal coming on the heels of only one 90% down day has been ill-fated in the past, that is they were always bear rallies, not the end of the bear.