A storm is made up of clouds, rain, lightning/thunder, gusts of strong winds and at times, snow. So, if it were a Logia, what will he transform into?
Clouds. When Goda draws it, what will be the difference between him in his Logia form and Smoer in his Logia form. They'll both be similar in visible comparison.
Rain. That's water falling in forms of drops. So that's out of the question.
Lightning = Enel
Wind. To invisible and a wind body doesn't incorporate lightning ETC...
Snow(?) = Monet.
Hence how a Paramecia would suffice and a Logia would make no sense.
I'm pretty sure it's yet to be revealed if he even as a fruit.