ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 51 Issue 11 > 2025,51(11):1571-1580. DOI:10.7519/j.issn.1000-0526.2025.111201 Prev Next
Analysis of the August 2025 Atmospheric Circulation and Weather
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Abstract:
In August 2025, the polar vortex in the Northern Hemisphere exhibited an eccentric distribution pattern with above-normal intensity. The mid-to-high latitude circulation over Eurasia displayed a “two-trough-one-ridge” configuration, with the high-pressure ridge east of the Ural Mountains being anomalously strong. The western Pacific subtropical high (WPSH) got significantly intensified, extending westward, and stably dominated the central and southern parts of China. As a result, the national mean temperature reached 22.0℃, being 0.9℃ above the climatological normal and ranking as the fourth highest since 1961 for the same period. Moreover, one persistent high-temperature event occurred during this month, with the number of high-temperature days exceeding the climatological normal by 1.7 days, ranking as the fifth most heat days in the historical record for the same period. The national average precipitation amounted to 114.5 mm, 7.0% above normal. During this month, there were a total of nine heavy precipitation events with severe precipitation repeatedly affecting South China, North China, the region from the Sichuan Basin to Northeast China, and some other places. Five typhoons were generated in Northwest Pacific and the South China Sea, but only one (Typhoon Podul) made landfall in China, thus the formation and landfall number of typhoon were both below the climatological normals. Typhoon Podul attained a maximum sustained wind speed of 42 m·s-1 prior to its landfall in southern Taiwan Island, China, at 08:00 BT on the 13th, exhibiting a typical feature of rapid intensification just before landfall. The anomalously strong WPSH led to precipitation deficits of 50%-80% in the central and eastern regions in south of the Yangtze River (Jiangnan Region) and eastern South China, so potential meteorological drought seemed to begin and develop. However, rainfall was 20%-100% above the normal amount across most of North China, central and eastern Northwest China, and the Pearl River Delta Region. Additionally, there were also regional droughts, severe convective weather, and hailstorm disasters during the month.
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