Diagnostic Analysis of a Convective Meiyu Rainstorm in Wuhan
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Abstract:
A convective Meiyu rainstorm took place in Wuhan from 5 to 6 July 2016, which caused serious urban water logging. The convective clouds influencing the weather system and physical elements are studied. The results show: (1) The convective clouds came from the eastern Jianghan Plain. During the heavy rain in Wuhan, two β convective cells merged at the first stage, and two 〖WTBX〗β〖WTBZ〗 convective cells merged with 〖WTBX〗α〖WTBZ〗 cloud successively at the second stage, in which rainfall in Wuhan strengthened dramatically. At the last stage, because the convective cloud cluster passed Wuhan without obvious merger, the heavy rainfall began to reduce, though there appeared the westward fingerlike convective clouds. (2) The heavy rain took place while the subtropical high was strengthening and moving westward. During the rainstorm, Wuhan was located at the northeast side of the ridge stretching eastward from the South Asia high at 200 hPa. The zonal shear line turned to a trough and moved eastward at 500 hPa; the vortex maintained over the Jianghan plain at 850 hPa. It was a favorable condition for the heavy rain that Wuhan was in the water vapor divergence zone locating at the left side of the northerly wind jet at 200 hPa, coupling with the water vapor convergence zone in front of the lowlevel southerly jet at 850 hPa.(3) As the wind direction over Wuhan turned out to be northwest at 200 hPa, wind speed increased at 500 hPa, both vertical shear between 200 hPa and 850 hPa and between 500 hPa and 850 hPa increased dramatically. Dry air appeared at 400 hPa. These three factors motivated the rainstorm to burst.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.