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<p>In the context of global warming, frequent extreme climate events seriously threaten human survival, cause huge economic losses, destroy natural ecosystems and exacerbating global climate governance challenges. This study focused on an extreme rainstorm in the Nanyang area, on July 15, 2024. Using observational and reanalysis data from July 14 to 16, 2024, the influencing factors for this extreme rainstorm event were examined. The results show that the “15 July” extreme rainstorm event was characterized by a declining trend from southeast to northwest, a long duration and massive precipitation. At 200&#xa0;hPa, dry and cold air was transported southward towards the northeastern side of the Nanyang region. At 500&#xa0;hPa, the Western Pacific Subtropical High (WPSH) extended northwestward, such that Nanyang lay in an unstable airflow region along the northwest flank of the WPSH. This synoptic configuration facilitates intense southwesterly advection of warm, moist air from lower latitudes, resulting in enhanced low-level moisture convergence and convective instability. On the 850&#xa0;hPa pressure surface, the water vapor and energy transported by the southwest monsoon provide critical conditions for the formation this rainstorm. The Nanyang Basin, acting as a barrier to the airflow, was another important factor contributing to the rainstorm. This study provides a scientific basis for disaster prevention and mitigation.</p>

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Extreme rainstorm on 15 July in Nanyang: Causes and comparison with regional typical events

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Danhong Fu,
  • Hongchao Liu,
  • Fengxian Lu,
  • Junjie Ma,
  • Liyao Wu,
  • Kaibo Wei,
  • Chunjin Lv,
  • Wenhu Chen,
  • Qingbin Fan

摘要

In the context of global warming, frequent extreme climate events seriously threaten human survival, cause huge economic losses, destroy natural ecosystems and exacerbating global climate governance challenges. This study focused on an extreme rainstorm in the Nanyang area, on July 15, 2024. Using observational and reanalysis data from July 14 to 16, 2024, the influencing factors for this extreme rainstorm event were examined. The results show that the “15 July” extreme rainstorm event was characterized by a declining trend from southeast to northwest, a long duration and massive precipitation. At 200 hPa, dry and cold air was transported southward towards the northeastern side of the Nanyang region. At 500 hPa, the Western Pacific Subtropical High (WPSH) extended northwestward, such that Nanyang lay in an unstable airflow region along the northwest flank of the WPSH. This synoptic configuration facilitates intense southwesterly advection of warm, moist air from lower latitudes, resulting in enhanced low-level moisture convergence and convective instability. On the 850 hPa pressure surface, the water vapor and energy transported by the southwest monsoon provide critical conditions for the formation this rainstorm. The Nanyang Basin, acting as a barrier to the airflow, was another important factor contributing to the rainstorm. This study provides a scientific basis for disaster prevention and mitigation.