[R] How to rank risks and opportunities;Tornado chart plot

[guox at ucalgary.ca]

I would like to use Tornado charts/diagrams to rank risks and opportunities
in a variable (for example, Cost) that depends on a few other variables
which have risks using R and R-packages.
I did some RSiteSearchs but did not find Tornado chart plots
and how to rank risks and opportunities.
Any ideas? Thanks,

-james