明日(あした) ashitaは wa雨(あめ) ameになり ninariそう souだ da。 It looks like it's going to rain tomorrow. Literal Tomorrow [topic-は] rain [to-に] become [looks-like-そうだ]. 雨になりそうだ — 'looks like it will become rain.' ~そうだ here is the evidence-based conjecture ('it appears that'), based on observable signs like cloud patterns. weather~そう (looks like)
明日(あした) ashitaは wa雨(あめ) ameになり ninariそう souだ da。 It looks like it's going to rain tomorrow. Literal Tomorrow [topic-は] rain [to-に] become [looks-like-そうだ]. 雨になりそうだ — 'looks like it will become rain.' ~そうだ here is the evidence-based conjecture ('it appears that'), based on observable signs like cloud patterns. weather~そう (looks like)