RobH_en_tn/jer/01/13.md

The word of Yahweh came to me a second time, saying

The idiom "The word of Yahweh came to" is used to introduce a special message from God. See how you translated a similar phrase in Jeremiah 1:4, and make any changes as needed. Alternate translation: "Yahweh gave me a message a second time. He said" or "Yahweh spoke this second message to me" (See: rc://en/ta/man/translate/figs-idiom)

whose surface is churning

The surface refers to the surface of the water in the pot. Jeremiah could see the water boiling. Alternate translation: "whose water is boiling" (See: rc://en/ta/man/translate/figs-metonymy)

tipping away from the north

This means that it was tipping toward the south, where Jeremiah was in Judah.