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１９９８年主汛期，由于西太平洋副热带高压持续偏南、偏强，中高纬度维持稳定的阻塞形势，６，７ 月雨带长期在鄱阳湖、洞庭湖地区徘徊，造成长江中下游地区严重洪涝；８月随着副高北抬，长江上游出 现多次强降水过程，长江干流受中下游洪水顶托及上游洪峰下泻的共同影响，水位居高不下，多数水文 站出现了超记录的历史最高水位。１９９８年的洪水已成为一次少有的新的长江大洪水的典型。
In the main flood season of 1998, due to the subtropical high in the western Pacific continuing to be strong in the south and strong in the middle and high latitudes, the rainstorm in June and July lingered in Poyang Lake and Dongting Lake areas for a long time, causing serious floods in the middle and lower reaches of the Yangtze River. In August, with the northward elevation of the subtropical high, there were several heavy rainfall processes in the upper reaches of the Yangtze River. The mainstream of the Yangtze River was affected by the flood top-middle and lower reaches of the Yangtze River and the downstream plunge of the upper reaches. The water level remained high, and the records of most hydrological stations recorded the highest records Water level. The 1998 floods have become typical of a rare new flood in the Yangtze River.