You seem to be saying that Jesus is someone who can rebuke God. Jesus IS God, therefore He cannot rebuke Himself. Instead of proving your point, your scripture reference actually shows you to be in error. Jesus is showing that He IS God and able to control the storm - that all things are under His control. This is yet another example from what He did and said that where He showed His disciples His deity. (cf Psalm 65:7, Job 38:11, etc.) Also think about why the storm came.
If God is out to wipe out sin using the form of a twister
You have missed the point. First of all, God was not using the wind to wipe out sin. Christ Jesus wiped out the penatly and power of sin on the cross and with His resurrection for those that trust Him and His return and final judgement WILL wipe out all sin. It won't be piecemeal by wind or rain, but totally by fire.
then I can suggest other countries to be devastated rather then the mid-west USA
The point is not that one part of the world is less evil than another. ALL of the earth is affected by the fall and ALL deserve eternal punishment. Piper's orginal article, and as it has been pointed out clearly on this thread that the storm is not a punishment to any certain people. Did you read Piper's article. We all deserve to be devastated.
Instead, the only One who was without sin, Jesus Christ, took all of our devastation upon Him --so that those who willingly trust in Him, who understand that there is nothing they can do to win God's favor and that God Himself took our place and desire to follow Him --they will be spared the final and eternal devastation. And instead of devastation in that Day, they will be clothed in His righteousness and glory.
As Piper said - the tornados are only a reminder of this somber truth- that earthly death comes to us all when we least expect it so we need to have our hearts cleansed with repentance.