An interesting phenomenon which can be seen at Kurnell in Sydney at times in Summer is the mini twisters created by the wing tip vortices from Jumbo's coming in heavy in Nor'Easters. They normally spin longitudinally, but sometimes go vertical and create a proper twister.
I've witnessed, as I'm sure many other locals have, the twisters whizzing their way across the bay sucking water off the surface as they continue their way down the bay kilometers away from the airport.

I remember a time when Gordo (early crew will remember Gordo

) actually kites into one. It whipped his kite around, lifted him, turned his kite inside out and spat him out in a mess. Very sudden and could have had a bad outcome. Perhaps this is part of the reason they have a 4 km exclusion zone. Not just safety for passengers, but for kiters too

DM