Graphical Abstract

Yamaguchi, M., and S. Maeda, 2020: Slowdown of Typhoon Translation Speeds in Mid-latitudes in September Influenced by the Pacific Decadal Oscillation and Global Warming. J. Meteor. Soc. Japan, 98, 1321–1334.
Early Online ReleaseGraphical Abstract NEW


Plain Language Summary: This study investigated whether the translation speed of tropical cyclones (TCs) has slowed in the western North Pacific basin during a post-geostationary satellite era from 1980-2019. Analyses of observational data and atmospheric reanalysis products revealed that the TC translation speed has significantly diminished over Japan, the East China Sea and their surrounding areas in September over the last 40 years. Historical model simulations with and without observational global warming trends reveal two main factors responsible for the translation speed slowdown: the Pacific Decadal Oscillation and global warming. Model simulations for a future warmer climate show that global warming further reduces the steering flows, leading to more slowly-moving TCs in autumn in the future.