Questions & Answers about Weht der kalte Wind, geht in die Kabine!
Why does the sentence start with a verb (Weht) instead of 'Wenn'?
This is a verb-first conditional clause. By dropping wenn (if) and putting the conjugated verb weht at the very beginning of the sentence, you create an 'if' condition. It means the exact same thing as Wenn der kalte Wind weht.
Who is being told to go into the cabin, and why is there no pronoun?
The verb geht is the informal plural ('you all') command form. In German imperative commands for ihr, you use the normal conjugated verb but drop the pronoun entirely. That is why it is just geht instead of geht ihr.
Why is it in die Kabine and not in der Kabine?
The preposition in is a two-way preposition. Because the action involves movement towards a specific destination (going into the cabin), it requires the accusative case (die Kabine). If you were already resting inside the cabin, it would take the dative case (in der Kabine).
Why does the adjective have an '-e' ending in der kalte Wind instead of '-er'?
Wind is a masculine noun, and here it is the subject of the clause (nominative case). Because the definite article der already clearly shows the masculine gender and case, the adjective just takes the weak ending -e.