On an intraday basis, volume is not all that it used to be.
THINK: what has happened to the markets of late?
Dark pools, liquidity rebates, iceberg strategies, HFTs, institutional traders covering their tracks etc etc have corrupted the predictive power of volume on an intraday basis.
Volume still has a place on an intraday basis, but one has to look for very specific circumstances where volume is useful information (clue: convergence of multiple timeframes).