That is consistent with what I remember hearing...I don't remember the lightning though...
It doesn't necessarily have anything to do with lightning. What happens when thunder storms are in the area is negative ions build up in the atmosphere, while positive ions build up in the ground. This is also known as static electricity. Just like in a magnet, opposites like to be with eachother. Since the negative ions can move around easier than the positive ones, they can "jump" from a place of higher negative energy to a place of higher positive energy. The only thing that lighning has to to with it is the fact that what we call lightning is when an increadibly large number of -ions jump to +ions either in another cloud or in the ground.
Of course, the -ions don't always have to jump in large groups, they can "migrate" individualy to things like, say the anti-static panels of a hydrogen airship which were designed to attract and hold stray -ions so they wouldn't create sparks. If there are enough ions like there are when T-storms are in the area, the panels can become full. When the panels become too full, the -ions will jump to a place of a lower concentration like any other part of the airship, and when, that spark touches that paint, no matter how small it is, you get a rather large bon fire really, really fast.