I was working as an extra in a tv show and during that day the weather was very bad very rainy and windy there was even a warning to people. During shooting very load thunders and lightning were happening. Ernst has many times talked about how Jupiter ruler thunder and lightning and how Jupiter is the lightning of inspiration that strikes us. I have been inspired by acting and working on movie sets for the last 2 years I wonder if this is literally Jupiter striking or is this a warning sign since it was a very bad storm. i never forgot this and have been wondering about this for months.
Thunder is never a bad omen, and the closer the better the chance to speak with the spirits. A good opportunity for praying. People who have been struck by lightning and survived are considered blessed and gifted. At least that is so in the native American traditions in Mexico where I live, and I doubt it´s seen differently in other ancient cultures.
As for the concrete thunder that you experienced it´s hard to say, you would have to provide more detail for that. Maybe some kind of tension on the set that had been building up and was now released?
Staffan