> 鳴神の 少し響みて さし曇り 雨も降らぬか 君を留めむ

Heard this in a movie. Really can't make sense of this grammar, to be honest.
Can anybody break down what's going on here?

Thanks :)
CC BY-SA 3.0
2015-11-06T17:59:06.003
29055
2015-11-06T17:59:06.003
11176
question
grammar
Need help making sense of this poem