Is awesome, and I want to try doing it.

Observation of thunder and lightning is one of the major forms of divination in ancient Rome, the others being auspicy (birdflight) and haruspicy (entrails, especially the liver). Birdflight was not so much a concern for the Etruscans, but they went for storm-omens and livers in a serious way. I should own more books on this subject than I currently do.