Bob, I'm so glad that you personally are ok and that your house received little damage. It doesn't matter if you're in Texas, Oklahoma, or Iowa - Tornado's are terrifying.
In 2008, an EF5 decimated a small rural town, Parkersburg IA, just west of Cedar Falls/Waterloo. It too was a Memorial Day weekend tornado that traveled across three counties that Sunday afternoon. Survivors talked about the sound the funnels made, like a haunting freight train approaching. The sky was absolutely terrifying that afternoon.
Ben