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If things are obvious to you that the stock market hasn't reacted to yet, it's a source of free money! So that can't be what you mean.
The market being irrational, uninformed, and late to react rarely makes it more predictable. If anything it makes it less predictable (if the market reflected a rational and well-informed model of the future, you would only need a better model in order to stay ahead of it).
In some rare cases though, it does make it predictable. Like what happened in late February / early March, or what is happening today. When something predictable is coming that is so big that you know the market will have to adjust eventually (though you can't know when).
“The market can stay irrational longer than you can stay solvent.” — John Maynard Keynes To a good extent, they are self-fulfilling prophecies, with stochastic eventual consistency Speculation (short, e.g. Soros) different from investment (long, e.g. Buffet), though
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