Actually DFW did close for a short time due to 45 knot cross winds, even for the cross wind runways. It was a very strange west wind that was blowing and giving us one heck of a dust storm... The airport authority in the US has the ability to close an airport. ATC does NOT have that ability, we can't even close runways... We can have a fouled runway that isn't closed but not useable, with that we will use other runways and send folks around that were destined to the one that is fouled...
regards
Scott