Two of them (mine included) got the title wrong, which is wehy I didn't find it when I looked before posting.
First time:
Now What? The Lessons of Katrina .
Second time:
Pop. Mechanics: Now What? The Lessons of Katrina ("largest, fastest rescue effort in US history")
I got the title wrong, and posted this a third time when my search did not turn up an article titles "What Now?" that related to Katrina.
Yep! I knew I had read it somewhere! :-)