Trouble now with the NYSE Advance / Decline Line:

Just an update from June 1, 2013 on the NYSE AD Line and just to repeat - according to Stockcharts.com – the Advance / Decline Line (AD line) One of the most widely used indicators to measure the breadth of a stock market advance or decline. The AD line tracks the net difference between advancing and declining issues. It is usually compared to a market average where divergence from that average would be an early indication of a possible trend reversal

I like the A/D Line although too bad it is not widely used by those younger technicians because like point & figure, it has an old foggy image. The upper plot is the S&P500 and the lower plot is the NYSE A/D line which is a worry now because of the double peaks of mid May and now. Keep an eye on that simple 20-day moving average. There could be a mild correction dead ahead.