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<p>From 31 July to 2 August 2022, a successive three-day gust front (GF) event occurred over southeastern coastal China, as clearly observed in satellite and radar data. Such successive GF events were uncommon in this region of complex hilly terrain. This study employed multi-source observations and reanalysis data to conduct observational and mechanistic analyses of these events. The GFs originated primarily from multicellular storms, with surface stations recording characteristic abrupt temperature drops and relative humidity increases. Results showed that the GF event was closely linked to specific synoptic conditions during the northward movement of Typhoon “Trases”, which established an environment conducive to parent storm and GF development. Composite analysis of non-GF days preceding and following the event indicated that GF occurrence was inhibited regardless of whether the typhoon was positioned south or north of the region. Conversely, the typhoon’s remote enhancement of land–sea circulation played an essential role in GF formation by moistening the boundary layer—an effect notably absent on non-GF days. Objective classification of mid-to-low-level circulation patterns from 2018 to 2022 (July–August) using T-mode principal component analysis with oblique rotation and self-organizing map showed that GF days corresponded to a circulation pattern occurring on only 2.9% of the total days, confirming the rarity of such synoptic configurations.</p>

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Synoptic-Scale and Mesoscale Features Favorable for the Occurrence of Three Successive Gust Front Days Over the Southeastern Coast of China

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Longbin Ye,
  • Jing Zhu,
  • Xin Huang,
  • Yipeng Huang,
  • Hui Zheng

摘要

From 31 July to 2 August 2022, a successive three-day gust front (GF) event occurred over southeastern coastal China, as clearly observed in satellite and radar data. Such successive GF events were uncommon in this region of complex hilly terrain. This study employed multi-source observations and reanalysis data to conduct observational and mechanistic analyses of these events. The GFs originated primarily from multicellular storms, with surface stations recording characteristic abrupt temperature drops and relative humidity increases. Results showed that the GF event was closely linked to specific synoptic conditions during the northward movement of Typhoon “Trases”, which established an environment conducive to parent storm and GF development. Composite analysis of non-GF days preceding and following the event indicated that GF occurrence was inhibited regardless of whether the typhoon was positioned south or north of the region. Conversely, the typhoon’s remote enhancement of land–sea circulation played an essential role in GF formation by moistening the boundary layer—an effect notably absent on non-GF days. Objective classification of mid-to-low-level circulation patterns from 2018 to 2022 (July–August) using T-mode principal component analysis with oblique rotation and self-organizing map showed that GF days corresponded to a circulation pattern occurring on only 2.9% of the total days, confirming the rarity of such synoptic configurations.