These pictures of our dog, Casanova, would appear to say it all. Note that Nova is deathly frightened of thunder/lightning. The room that you see him in is actually a bathroom in the apartment that is totally dark. Only the flash of the camera lit his area up.
So, needless to say, Nova rates this storm as worthy of cowering in a darkened bathroom in the middle of the apartment, far away from all windows. We did eventually coax him out to watch TV with us, but it took some convincing that he was relatively safe.