 Gallus said data show tornadoes occurring on fewer days each year but coming in clusters and with greater intensity. He says some storms have been listed as Category F3 or probably F5s, but measurement methods in some areas are not adequate to gauge the storm's intensity. More news, KMALand.com. For KMA, I'm Derek Martin. Keep up to date with the ever-changing markets. Weekdays on KMA 960 Shenandoah and KMA FM 99.1, Clorinda, Shenandoah.