After looking at some of the video and photos of the buiding on the news this morning, it's frankly amazing that there were so few casualties. We had pleasant if slightly muggy weather yesterday afternoon and no suggestion of the windstorms only a couple of hundred miles further north.
I'm glad to hear that the local Mudcatters are OK, as are most of the other folk I know in the DFW area. Those in Grapevine are still a little rattled, though.
A little less than a decade ago, several Houston skyscrapers shed many windows but apparently kept a tornado vortex from getting well organized. Winds in excess of 90mph were recorded at ground level. The same storm front pushed offshore and caught us racing sailboats. Our wind "ferocity" indicator pegged at about 96kts, and at one point the next landfall was in somewhere in Cuba. However, it's truly an awesome sound when the funnel gets within a few miles.
Just out of curiosity, did the FW tornado path seem to follow any topological features? Usually they seem to strike along relatively flat terrain.