ABSTRACT This study investigates the climatological characteristics of remote rainfall in northeastern Taiwan during the cold half‐year of 1980–2023. We identify critical factors driving heavy precipitation when tropical cyclones (TCs) are located south of Taiwan. Spatial analysis reveals distinct rainfall ‘hotspots’ that shift southward from Yilan depending on the TC's specific position. Statistical results indicate that heavy rainfall is primarily governed by extrinsic environmental thresholds, specifically moisture convergence and specific humidity. Validation using 2024–2025 cases confirm the robustness of these thresholds. We conclude that the interaction between background northeasterly flow and TC positioning acts as the dominant control. This relationship suggests that future climate‐induced changes in TC tracks may displace established rainfall hotspots, potentially altering regional hydroclimatic risks.
Hsu et al. (Fri,) studied this question.
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