Tornadoes over water are too weak to lift sharks, but strong enough to bring smaller animals ashore. Sharks fell from the sky in the SyFy Channel’s “Sharknado,” a campy movie that stirred up Internet buzz and is getting a sequel. The premise of the movie can be summed up in this line uttered by one...

Tornadoes over water are too weak to lift sharks, but strong enough to bring smaller animals ashore. Sharks fell from the sky in the SyFy Channel’s “Sharknado,” a campy movie that stirred up Internet buzz and is getting a sequel. The premise of the movie can be summed up in this line uttered by one...