I got my slides back this afternoon, and I didn't have nearly as many keepers as I'd hoped. I think the biggest problem was that a lot of the lightning was behind the clouds, so the light wasn't as intense and thus wasn't captured as well on the ISO 100 slide film. For the few real bolts of lightning that were visible, I got some pretty good stuff. Here are two I picked out.
Earlier in the evening when there was still some light in the sky and some pink on the horizon.
And later on when there was no light but the lightning. I was hoping it would silhouette the catwalk like this, but I'd hoped for more definition on the lighthouse towers.