Photographs of extreme weather events, especially the relatively short-lived ones like tornadoes and thunderstorms, are fairly common these days. There are so many inexpensive devices capable of capturing them knocking around, and so many of us have them.
But such photos were pretty thin on the ground back in 1917. Here's a waterspout - near Genoa - caught on camera at Sestri-Ponente.
Pic from The Engineer, 23 February 1917 issue, page 183.