Reflections on US tornadoes: Are natural disasters judgments from God?

This is a sticky question, and one I’ve struggled with.

• John Piper wrote in 2009 that a tornado in Minneapolis was a judgment on the Lutheran church for its stance on homosexuality.
• Greg Boyd disagreed.
• I was thinking of this after the April 2011 tornadoes in the United States, and the numerous churches damaged or destroyed, including:
• This Assembly of God church
• Alabama churches: Baptist and Methodist
• Church of God of Prophecy
• Several Southern Baptist churches

Were all of these churches somehow in need of judgment? Despite the Scriptures bandied about, I have significant problems thinking of all tornadoes (and natural disasters in general) as the judgment of God. I prefer the approach of C. S. Lewis: God has made this world a dangerous place in part because only in the context of danger do eternal issues of character come to the fore.

What do you think? How do you reconcile this?