I stumbled onto this chart a while ago. It might be stating the obvious, but sometimes I need a slap to the face. http://stockcharts.com/c-sc/sc?s=%24SPX&p=M&yr=20&mn=6&dy=0&i=p50188715816&a=369739463&r=1443217662368 When Williams % is above -20; trend is up. When below -50; trend is down. When between -20 and -50, be cautious. GLTY