The dead tree in the distance is a subject I've used a few times and I'd been unhappy with what I'd taken that day until I starting heading home and looked back to see this scene. Five minutes later I was running like mad to get back to my car before the deluge, I got there just in time fortunately and drove home with the windscreen wipers at full speed and the headlights on.
Cheers
Joking aside, that slate sky really makes it - 'transient light' at its finest.