Graphical Abstract

Chien, F.-C., Y.-C. Chiu, and C.-H. Tsou, 2021: A Climatological study of southwesterly flows and heavy precipitation in Taiwan during Mei-yu seasons from 1979 to 2018. J. Meteor. Soc. Japan, 99,
Early Online ReleaseGraphical Abstract NEW GA


Plain Language Summary: During active years of southwesterly flow events, the Pacific high weakens and moisture is transported from the South China Sea to the Taiwan area in the early mei-yu season. The moisture-laden air results in a large equivalent potential temperature gradient to the north of Taiwan, favoring the formation of mei-yu fronts and low pressure systems. The pressure gradient thus increases and southwesterly flows develop. More moisture is transported toward Taiwan, resulting in heavy rainfall as well as a further increase of equivalent potential temperature.