Learn Polish: Gdy nadchodzi sztorm, każdy chce wrócić zdrów. - When a storm is coming, everyone wants to return safe and sound.

zdrów is a predicative short-form adjective. While zdrowy is normally used to modify a noun directly, zdrów is used here to describe the state of the subject as the action happens, translating well to the phrase safe and sound. Note that zdrów is only for masculine subjects; if the subject were feminine, you would just use the standard adjective zdrowa.

Is there a difference between sztorm and burza?

Yes, there is a big difference in context! sztorm specifically refers to a severe storm at sea with high winds and waves. A burza is a typical thunderstorm you experience on land. Because this sentence uses sztorm, it implies the people wanting to return safely are sailors or out on the water.

Why does the sentence use the singular verb chce when it talks about everyone?

Just like the English word everyone, the Polish word każdy (which literally means each or every) is grammatically singular. Because it is singular and masculine, it perfectly matches both the third-person singular verb chce and the masculine short-form adjective zdrów.

Why is the first verb nadchodzi imperfective, but wrócić is perfective?

nadchodzi is imperfective because the storm is in the ongoing process of approaching. On the other hand, wrócić is perfective because the focus is on the one-time, completed action of successfully making it back.