Every year, a belt of cloud that is the forerunner of formation of baiu front (technically, it is sometimes called as "quasi-steady cloud belt") is spawned.
例年、華南や南西諸島南方沖付近で5月上旬に梅雨前線のでき始めとなる雲の帯（専門的には準定常的な雲帯と呼ぶことがある。）が発生する。