This book isn’t so much about the Moore/Oklahoma City Metro Area tornado of 1999 (though the author does talk about it in a few chapters) but more about the (brief) history of tornado forecasting, tornado research & science, governmental non-response, and the life of Ted Fujita (Mr. Tornado).
If you like Simon Winchester’s “Crack at the Edge of the World” (about the Great San Francisco Earthquake, it is set up in about the same way. Very little attention was paid to the actual events, but more on the science & history of the area of interest (in Winchester, geology & seismology, & the history of SF; in Mathis, meteorology).
Otherwise, it is a quick, simple read of an interesting subject.
One thing of interest (gross interest, mind you): After the tornado a horse was found running around blindly because the tornado had suck its eyes out. Amazing the power of tornadoes.