acid rain

A dark cloud moves towards your position and starts to unleash a torrent of acid rain that lasts one hour. Each creature on their turn within range must make a Constitution saving throw or take 5d6 acid damage on a failed save, and half as much on a successful one. Any creature that is adequately sheltered from the rain does not take any damage.

the spell only moved the cloud here, any effect(s) like disspell that ends the effect of a spell will not work.