noun
A meteorological term for a low-pressure system that forms over tropical waters. In Japanese weather contexts, it often refers to a tropical depression or a developing cyclone before it reaches typhoon strength.
熱帯低気圧が今夜から明日にかけて接近する見込みです。
A tropical cyclone is expected to approach from tonight through tomorrow.
この熱帯低気圧は今後24時間以内に台風に発達する可能性があります。
This tropical cyclone may develop into a typhoon within the next 24 hours.