ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Multi-scale Characteristics of a Severe Wind Event Happened at Tianjin Airport Associated with a Squall Line
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Abstract:
This study analyzes the damaging winds event (maximum wind speed of 31.5 m·s-1) happened at Tianjin Airport on August 4, 2013, focusing on the synoptic background, storm structure and the formation mechanism of severe winds. The results show that this case occurred in the unstable region behind the upper-level trough, which has a prominent midtropospheric dry layer while moisture is mainly concentrated at low levels below 925 hPa. The convective available potential energy is greater than 3000 J·kg-1, in addition to the strong 0-6 km vertical wind shear and the large lapse rate in the boundary layer, is conducive to the formation of severe winds. The damaging winds are caused by a northwest-southeast propagating squall line. A wind speed spike and pressure surge is observed during the gust front passage, prior to the arrival of the convective line. And the maximum wind gust happens when the squall line arrives, resulting mainly from the downburst of a rapid developing multicell storm. A strong rear inflow jet and the decline of it, together with the latent cooling, hydrometeor loading and the convergence of mid-level airflow are responsible for the formation of strong downdrafts and severe surface winds.
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Project Supported:
Heavy Rainfall Research Foundation of China（BYKJ2024M05）
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