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Causes of the Outer Spiral Rainbands in Typhoon Yagi (2018)
in Shandong Province of China
SHENG Chunyan , FAN Sudan , QU Qiaona , LIU Shijun , ZHU Wengang 1, 2
1, 2
1, 2
1, 2
1, 2
(1. Key Laboratory for Meteorological Disaster Prevention and Mitigation of Shandong, Jinan 250031, Shandong, China;
2. Shandong Institute of Meteorological Sciences, Jinan 250031, Shandong, China)
Abstract: On August 14, 2018, Typhoon Yagi (2018) moved northward and impacted Shandong Province of
China, resulting in widespread rainstorm and heavy rainstorm. The total rainfall caused by the typhoon in Shan‐
dong presents a round-shaped distribution. Specifically, on August 14, an outer spiral rainband appeared on the
typhoon periphery in southeastern Shandong, bringing short-term heavy rainfall and local heavy rainstorms. Due
to the relatively small scale of this rainband, both numerical forecasting models and forecasters face challenges
in predicting its rainfall accurately. To study the mechanisms of the outer spiral rainbands of Typhoon Yagi, the
characteristics and causes of the spiral rainbands are investigated in this study by using radar data and the observa‐
tions from ground-based stations, radiosonde stations and aircraft. Numerical experiments are also conducted