EDIT: so after reading through the thread since my last post, I guess it comes down to your interpretation. One can interpret what Obi-Wan said in a way, and others naturally in others. I too, like Warb, thought Yoda had created the lighting out of thin air. It’s not something I really have a problem with anyway, just a huge 6 page discussion over a minor nitpick. Then again, this is the Star Wars fan base.
I don’t know how you can say he conjured it out of thin air when the movie makes it a point to show it coming from storm clouds. You can’t just ignore something that’s right there in the movie.
As for how this has blown into a huge discussion, well let’s not forget about Luke force choking, at least this debate is on topic!