The sensationalization of disaster skews the perception of both its frequency and its intensity. A bus runs off a cliff in Mozambique, thirty people are killed, and it doesn't even make the last page of American news. One black teenager doing something foolish is shot and the country is up in arms (or down on their knees... and not to pray).
Is there a connection between God's judgment and the disasters that have befallen the US in the last thirty years? Well, maybe. Any time someone tries to make the connection, it always seems tenuous. We live in a fallen world, and we would do well to heed Jesus' words to the people of Jerusalem: Stop sinning or something worse may happen to you. I don't think he meant a worse "natural disaster", but an eternity apart from Him.