ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 45 Issue 2 > 2019,45(2):155-165. DOI:10.7519/j.issn.1000-0526.2019.02.002 Prev Next
General Features of Squall Lines with Disastrous Gale in the YangtzeHuaihe Area
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Abstract:
Based on the Doppler radar data, surface observation and rawinsonde data collected from April to September during 2000-2017, 35 squall line cases in the YangtzeHuaihe Area are identified. These squall lines occur most frequently in the plain to the north of the Yangtse River. The squall lines peak in July and a large proportion of them generate in early afternoon, mature in late afternoon, and dissipate in evening. The squall lines have a dominant southeast motion at the speed of 8-16 m·s-1. They are characterized by the maximum length of 200-250 km, the maximum intensity of 60-65 dBz, and the duration of 3-4 h. The squall lines commonly form in a brokenareal pattern, display a trailingstratiform pattern, and dissipate in a reversed brokenline pattern. The ambient flows of the squall lines are classified into five synoptic patterns, which are preshort trough, prelong trough, cold vortex, around subtropicalhigh and posttrough patterns. About 62.9% of the squall lines form in the dominant pretrough pattern. Prelong trough squall line causes the largest surface cooling. The radar echo cores of prelong trough and cold vortex squall lines are higher and the weather is more severe. Besides precipitation and thunderstorms, hail or tornado can also occur. Favorable conditions for the different patterns have been analyzed in the terms of instability, vertical wind shear and so on.
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