1. When we use 'and' to connect two parts of a sentence, we often assume that some of the elements before the 'and' (namely 'a' ) transfer to the part of the sentence after 'and'. Therefore, I would change the order to... There was rain and a hail storm on Friday.
2. This is not how we normally say it in English. Instead say... On Friday, there was a storm with rain and hail. (still sounds a bit awkward)
3. Friday it was rainy. There was a hail storm, too. (Or... There was also a hail storm.)