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| Study on an extreme rainstorm in western Hexi Corridor based on collapse theory |
| Wang Haiyan, Tian Qingming, Liu Xinyu |
| Jiuquan Meteorological Bureau,Jiuquan 735000 |
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Abstract Based on the meteorological observation data and NCEP/NCAP (1°×1°) reanalysis data from June 20,2019 to June 21,2019 in Jiuquan city of Gansu province,an extreme rainstorm is forecast and analyzed based on the collapse theory.The conclusions are as follows: the rainstorm process is blocked by the high pressure ridge of the crooked neck in Hetao area and the dynamic uplift in front of the Qinghai vortex.Based on the collapse theory,five physical quantities of atmospheric vertical structure potential temperature(θ),pseudo-equivalent potential temperature(θse),saturated pseudo-equivalent potential temperature(θ*),specific humidity and vertical velocity at future time are derived into 69 characteristic quantities to describe V-3θ diagram.The time and advance of this rainstorm process are determined,but the calculation of rainstorm range and precipitation level by the derived V-3θ precipitation forecast map needs to be improved.
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Received: 25 October 2020
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2021, Vol. 38 
