Numerical Modeling of a Disastrous Supercell Hailstorm and Analysis on Its Developing Mechanism
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Abstract:
A widerange disastrous supercell hailstorm occurred in Zhejiang Province on 21 March 2019 is simulated by using the highresolution mesoscale WRF model. Combined with Doppler radar detection products, the characteristics of radar echo structure, flow field structure, hydrometeors and their evolutions are analyzed, and the physical mechanism of hail formation is explored. The results show that the hailstorm occurred and developed in the area where the right side of the highlevel jet axis overlapped with the lowlevel shear line. Strong vertical wind shear contributes to its maintenance and development. The supercell hailstorm exhibits typical characteristics of hook echo, longlasting deep mesocyclone, strong hanging echo, bounded weak echo area, and strong threebody scattering on radar echoes. The simulation experiment successfully simulated the horizontal evolution and vertical structure of the hailstorm clouds. Suitable layer heights of 0 ℃ and -20 ℃， as well as an appropriate thickness of the 0 ℃ to -20 ℃ layer, are conducive to the growth of hail particles. Hail particles are mainly transformed from cloud water, supercooled rain water and snow particles and then continue to grow by collisioncoalescing with supercooled cloud water, ice crystals and snow particles.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.