The weather that hit the area began as a cluster of thunderstorms that formed along the Ohio River moving south.

CNN: Crews search Smoky Mountain wilderness after deadly storm

Called Shaping a Healthier Future, the area's health cluster believes having fewer, but more specialist centres, will enhance what it delivers.

BBC: Charing Cross Hospital

Dell, which employs 7, 000 people in the Austin area, is the main company in Austin's second cluster of 250 computer-related companies which together employ 38, 000 people.

ECONOMIST: Something stirs

But a Royal visit should help to put the tech cluster on the map, and perhaps make the government's ambitions to turn the area into Europe's rival to Silicon Valley look slightly less fanciful.

BBC: Tech City - by Royal Appointment