In his book "The Visual Investor," John Murphy points out that a positive divergence between the MACD and the MACD Histogram is one of the first signs that a stock is starting to move higher. Here's an Advanced Scan that looks for these divergences:
[type = stock] and [country = us] and [daily sma(20,daily volume) > 40000] and
[macd line(12,26,9) < 0] and
[macd line(12,26,9) < [10 days ago macd line(12,26,9) * 1.05]] and
[macd hist(12,26,9) > 0] and [10 days ago macd hist(12,26,9) < 0] and
[macd hist(12,26,9) > [10 days ago macd hist(12,26,9) * 1.05]]
The first line of this scan limits this scan to US stocks with healthy average daily volumes.
The second line makes sure that the MACD has been moving lower for some time - i.e., it is below the zero line.
The third line looks for stocks whose MACD is at least 5% lower than it was 10 days ago.
The fourth line makes sure that the MACD Histogram has been rising recently - i.e., it's above zero - and that it has crossed over the zero line sometime within the past 10 days.
The last line makes sure that the MACD Histogram is at least 5% higher than it was 10 days ago.
Running this scan today returns a bunch of results including:
Note: The time period (10 days) and the percent increase/decrease (5%) should be adjusted to fit your own personal trading style and goals.