Sure, you get a nice upward green bar with average or above average volume and all looks OK - but that upper wick means someone knocked the price down from the high - we wait for the next day and if it is red then we know that there was weakness the day before (hidden selling) that wasn't obvious. Made worse in this case because the smarties sold into that announcement, they were just waiting.
I'll post you a link tonight to the "Charting and chat" forum on this site - invaluable and a one stop shop for charting., and it's free.
