TITLE:
Research on the Mechanism of Intense Variation in the Strength of Super Typhoon “Yagi” and Analysis of Its Causes
AUTHORS:
Weiyi Zeng, Guangze Gao, Hongze Leng
KEYWORDS:
Super Typhoon “Yagi”, Explosive Intensification, Dynamic-Thermal Coupling, Steering Airflow
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.14 No.5,
May
29,
2026
ABSTRACT: Typhoon “Yagi”, the 11th super typhoon of 2024, underwent extreme explosive intensification in the northern part of the South China Sea, setting a record for the duration of a super typhoon in the South China Sea area and posing significant disaster risk. Based on ERA5 reanalysis data, Fengyun-4B (FY-4B) satellite, Doppler radar, and typhoon optimal path data, this study employed the coupled diagnostic of dynamics and thermodynamics, three-dimensional wind field decomposition in cylindrical coordinates, and vertical weighting of guiding airflow to analyze the mechanism of intensity abnormal evolution, the response of the core structure, and the path control factors. The results show that “Yagi” has an optimal dynamic configuration of strong positive vorticity in the lower layers and weak negative vorticity in the upper layers, strong convergence in the lower layers and strong divergence in the upper layers; the warming structure from 300 to 500 hPa is deep, combined with the spiral humidity distribution to form a stable thermal support; the eye wall wind field and intensity outbreak height are coupled, weak environmental vertical wind shear ensures the axisymmetric structure; the easterly guiding airflow dominates the path, and the abnormal warm sea surface temperature in the South China Sea continuously supplies energy. This study can provide theoretical and technical support for the forecast and warning of super typhoons in the South China Sea during the autumn season.