In the month of August, Katrina took a trip,
In from the Bahamas to the mighty Mississip,
Smashed down the leevees and the hurricane screens,
And brought death and destruction to the town of New Orleans.

Well the mayor said 'Run, Katrina is a-coming,
And how we can escape her I don't rightly know'
Katrina struck and left us all a swimmin'
Up the Mississippi from the Gulf of Maxico.

Apologies to Johnny Horton!
Chorus doesn't quite go together as I would have liked.
May think of some more, but if anyone else wants to have a go, feel free.
FC