What Stands in a Storm by Kim Cross - it's about the April 2011 tornado outbreak that spawned hundreds of tornadoes over three days. It hits close to home for me because we had catastrophic damage from this storm here in Alabama. Our state weather superstar wrote one too, if you're interested, but I don't know if there's an ebook of that one.
Do you mean April 27, 2011? https://en.wikipedia.org/wiki/2011_Super_Outbreak