  ::Getting 46 named storms in the Atlantic will never happen while humans live on this planet. If the Greek names were retired one by one, it is possible to eventually run out of them (This also won't happen in your lifetime, and certainly naming systems would change before then). To answer your question hypothetically though... they would call it Unnamed Tropical Storm #46 if they didn't put an emergency naming list into effect. (What a hellish year that would be.) — 