Sorry for the wait I will be using Halibel my Female Corphish.

Halibel start of with Hail to get some ice raining down, then use Ice Beam to create a protective bubble of ice around you then move it around a bit to try and get some of the ice shard to stick into before breaking it open with Crabhammer. Look up at the raining shards before firing a Bubble Beam into the air with a played down Rain dance to make it look like you have turned the Hail into Rain.

Hail ~ Ice Beam ~ Crabhammer ~ Bubble Beam ~ Rain Dance.