It is implied that on that day, Yahweh will punish people. Alternate translation: "It will soon be the day when Yahweh will punish you" (See: [[rc://en/ta/man/translate/figs-explicit]])
Dark storm clouds represent danger and fear. Alternate translation: "It will be like a day with dark clouds" or "It will be frightening like a day with dark clouds" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The abstract noun "doom" can be translated with the phrase "terrible things will happen." Alternate translation: "a time when terrible things will happen to the nations" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])