Actually Palagius was the one who believed "God has foreknowledge of human action but does not cause them (free will)"  not Augustine.  Calvin often quoted Augustine and had the same view on the will of man.  They believe humans have a compatibalistic will which is consistent with what the bible teaches.

Here is a portion of what I posted to moinmoin in another thread on examples of compatibalistic will.

It all comes back to God's purpose for putting us here. If our purpose in ultimately returning to live with God is to have learned, grown, made progress, and proven ourselves, it all makes a lot of sense. My absolute favorite area on my mission was in the former East-German town of Halberstadt (about 30,000 people). It was after the reunification, but unemployment was still way higher than it ever was during the Great Depression here (it was about 25%). It was like living in a black and white movie in a lot of ways; you'd run into people living in abandoned buildings and eeking out an existence. Multiple generations had also grown up under atheistic Communism as well, and my first couple of weeks, everyone we talked to, right off the bat, would say "If there is a God, then why does _____ happen? ("Ach, wenn es einen Gott gäbe . . .". This was intended to be unanswerable, but we quickly learned to ask first why the world is so awful, why does so much bad stuff happen and exist? People were very happy to discuss this question, and then we asked if they would read a brief quotation from President Kimball we had typed up and comment on it. This was much more effective, because it took away this "unanswerable" question of how there could be so many terrible things and conditions in the world if God exists:

Most people agreed with much/all of this, and we explained that this ties into our purpose for being here, may we come in and talk further, etc. We would often ask people if they had children, and if so, if they hovered around them constantly as they learned to walk to make sure they never fell down or hurt themselves. "Of course not!" Why not — you knew that would happen; wouldn’t you want to preserve and protect your child from things that will hurt her that you know for a fact will happen if you don’t intervene? "Well, she’d never learn to walk that way!"

I can see a lot of value in God, even with full foreknowledge of our choices and their consequences, letting us make these choices anyway. We would never learn to walk without suffering the good and bad consequences of our good and bad choices. The test is for us, not God.

Does that help?

So, the people killed in the tornados had learned, grown, made progress and proven themselves and they were called back to heaven?

HA HA

You are  the 1st person to recognize that.  And yes it was an intentional play on the german word and my name.

I always feel the best way to know why God does things is using his Bible which  he gave to communicate to us.

I could give my opinions but it's always better to hear from God himself, here is a Biblical example of why God allow tradegies:

Luk 13:2  And he(Jesus) answered them, "Do you think that these Galileans were worse sinners than all the other Galileans, because they suffered in this way?
Luk 13:3  No, I tell you; but unless you repent, you will all likewise perish.
Luk 13:4  Or those eighteen on whom the tower in Siloam fell and killed them: do you think that they were worse offenders than all the others who lived in Jerusalem?
Luk 13:5  No, I tell you; but unless you repent, you will all likewise perish."

I'll repent as the roof gets pulled off the house and not a minute sooner.

Just in case.