What does 1 Kings 17:1 mean?

Now Elijah, from Tishbe in Gilead, said to Ahab, As surely as the Lord, the God of Israel whom I serve, lives, there won’t be any dew or rain these next few years unless I say so. 1 Kings 17:1 - Modern Text Bible

(Elijah appears suddenly and announces a drought as a direct challenge to Ahab and Israel’s idolatry. This sets up a confrontation between God and Baal.)