I have to write a Greek Myth?

Ok. so i've been thinking about this for a week, and im still confused
i have a few ideas but i don't see a rea story line coming out of it.
like possibly why their is rain.. or why their is lightning..
i have no clue what to write about..if u have any ideas (only serious ideas) then PLEASEE help me
Thank you in advance.

How do i write a greek mythology story?

I have to write a 5 paragraph story about how rain came about using one god from ancient GREECE. please help. it must have one fake character and one god or godess