The invisible motion of transparent air looks a LOT like messy black lines.

I did get the picture, though.

(Historical Notes: All things considered, it was far from the worst weather I’d ever seen at Katsucon, but I do think this was the one time that it was specifically WIND that was the problem, not some manner of precipitation.  And yes, there actually was some poor sap out there with a wigged cosplay, seriously regretting the life choices that led him to this moment.)