Preachers of doom and prophecy are busy announcing the warning signs:

They [Hurricane Katrina, et al] provide us with graphic, striking previews of the chaos and misery that will prevail during the coming time of tribulation. In this way they serve as a stern warning and foretaste to all of what is coming upon the Earth and should lead people to repent before it’s too late (Luke 13:1-5) – Mark Hitchcock, contributing editor of the Left Behind Prophecy Club newsletter, pastor of Faith Bible Church in Edmonds, Oklahoma, and a nationally recognized prophecy author and speaker