Not sure if this is the right area to post- but a question or idea...

Most indicators are based on the previous price action so are usually not predictive in nature. There are a few that seem to be predictive although you can probably find just as many examples where they don't work... Anyways, not a new idea most likely but any thoughts on an indicator that bases it's alert on a volume break of a certain level? If it already exists could someone post a link, please... Here's an example: