Granville OBV Technical Indicator

I have always found the Granville Onbalance Volume indicator a reliable piece of information to follow during periods when volume is at odds with direction. 

What we have been seeing since late July is that upside volume has been more than negated by down side volume.  From an overall value viewpoint, OBV numbers topped on 7/26/13 for the Dow, 9/18/13 for the S&P, and 9/19/13 for the NASDAQ.