Where are you guys proposing these 450,000 people, in the city alone, relocate to?
Are there houses in your neighborhoods in which they could reside?
We get tornados from time to time. I suppose I can live here and have insurance on my place because hey, there's a chance a tornado might miss you. I'm sure there's a table or chart somewhere pertaining to the risk I take living...well, anywhere.
edit: I just realized the insurance on my moon dome is going to be OUTRAGEOUS!