What would be the impact of a nuclear explosion in the US?

AUSTIN (KXAN) — University of Texas at Austin faculty and students are beginning research through a grant with the Department of Homeland Security to learn more about what would happen if a nuclear explosion occurred in the U.S.
These UT researchers alongside the Air Force Technical Applications Center are looking for the type of information that would help senior decision makers respond to a nuclear event.
Assistant Professor Derek Haas and his students have just started on this nucl