jonathan wrote:

I wonder if Fema has even considered the possibility of
having to run two large operations at the same time?

Yes, though the disasters weren't hurricanes and numbered
considerably more than two:

http://www.fas.org/nuke/guide/usa/napb-90/execsum.html
http://www.fas.org/nuke/guide/usa/napb-90/index.html

Having considered the possibility, one might wonder how
far FEMA went in preparing to deal with it. Though some
individual states used the disaster scenario developed as
the basis for their own planning:

http://www.tnema.org/Archives/EMHist...DHistory10.htm
http://www.macombcountymi.gov/OEM/pdf/HMP/Chap1_2.pdf