Is this sentence a metaphor (comparing a word or phrase to a person, place, or thing)? Or at least the first part?

"The sky broke open and rain poured down"

Yes that is a metaphor that is comparing two things which are the sky and rain.

Explanation:

answer: the three main types of third-person point of view are: white employ the third-person-omniscient point of view. third-person limited: a narrator reports the facts and interprets events from the perspective of a single character.

explanation:

i think the answer your looking for is

enforced