From the OED:
Of, pertaining to, or of the nature of a tornado.1884 Amer. Meteorol. Jrnl. I. 7 Four series of storms of tornadic character have passed over the states east of the Mississippi River since the beginning of the year. 1890 Columbus (Ohio) Dispatch 13 June, These are tornadic conditions. 1898 H. W. LUCY in Daily News 18 Feb. 2/2 Mr. Orchardson’s portrait..presenting the ex-Speaker in one of his not unfamiliar tornadic moods.
“Tornadic” is not a word I was familar with before moving to the American Midwest. Now I hear it fairly frequently. Tonight the local television stations pre-empted quite a bit of prime-time programming to keep us up to date on the weather. Talking heads and brightly colord maps do not make for exciting watching, let me tell you. A dramatic storm with golf-ball-sized hailstones passed over us about an hour ago. No tornados, though.
Has a tornado ever hit a big city downtown? Hmm.