Numerical Simulation of ‘7·31' Severe Convection Event in Shanghai Using Rapid Refresh Technique

WANG Xiaofeng;WANG Ping;ZHANG Lei;XU Xiaolin;LI Jia

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Plateau Meteorology
Plateau Meteorology ›› 2015, Vol. 34 ›› Issue (1) : 124-136. DOI: 10.7522/j.issn.1000-0534.2013.00202

Numerical Simulation of ‘7·31' Severe Convection Event in Shanghai Using Rapid Refresh Technique

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Abstract

Using multi-source observations, such as Doppler radar, AWS, AMDAR and radiosonde measurements, and the high-resolution numerical model WRF as well as the advanced data assimilation system ADAS, a numerical simulation of the server convection event, which occurred in Shanghai on 31 July 2011, was conducted using rapid refresh technique. The results showed that the model correctly predicted this server convective weather process, the timing and location, as well as the variation of the precipitation along with the time were well consistent with the observations. It was also found that due to the thermal difference between land and sea, two sea breeze from different north and south directions met in shanghai area and low level convergence line formed, as a results, weak updraft in boundary layer appeared, combined with the local urban heat island effect, created favorable conditions for triggering the server convections; and the high gradient of moisture between low level and middle level and its unstable vertical structure provided favorable conditions for moisture vertical transportation. The numerical simulation using rapid refresh technique issued early warning of this server convection occurrence 10 hours in advance, and this provided a new way for the megacity operational convection forecasts.

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Severe convection / Rapid refresh / Sea breeze / Urban heat island ef / Boundary layer conve

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WANG Xiaofeng , WANG Ping , ZHANG Lei , XU Xiaolin , LI Jia. Numerical Simulation of ‘7·31' Severe Convection Event in Shanghai Using Rapid Refresh Technique. Plateau Meteorology. 2015, 34(1): 124-136 https://doi.org/10.7522/j.issn.1000-0534.2013.00202

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