Symbolism, Imagery, Allegory
Ever feel like nature is out to get you? It might be in The Revenger's Tragedy. Vindice sees thunder and lightning as signs of God's judgment. For instance, while commenting on Lussurioso's sins in an aside, he says:
Has not heaven an ear? is all the lightning wasted?
(4.2.176)
Vindice literally wants the sky to open and smite Lussurioso. And he kind of gets his wish: a comet appears right before everything goes haywire for Lussurioso (a.k.a. he gets murdered). The comet itself doesn't hit Lussurioso, but it does seem to be a beacon of all the radical change that's about to happen. In fact, Lussurioso fears the comet is a sign of a dramatic change in destiny, and given that his whole family is dead by the end of the act and someone else is ruling their country, we'd say he's right.
Natural phenomena, then, work as symbols in two ways: They indicate change, and they also suggest some sort of higher moral compass—otherwise Vindice wouldn't implore the skies to make things right on earth.