ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis on Radar Observation Characteristics of a Local Outsize Hail in Liupan Mountains, Ningxia
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Abstract:
Based on the observation data of Guyuan C-band Doppler weather radar and X-band dual polarization radar, combined with ERA5 hourly reanalysis, Himawari-8 satellite, automatic weather station and conventional observation data, the causation and radar observation characteristics of a local outsize hail (diameter ≥ 5 cm) event which occurred in Liupan Moutains area of Ningxia on 12 July 2021 is analyzed. The results show that: (1) The supercell storm formed by the merger and development of multicell storm caused the occurrence of outsize hail. The mesoscale ground convergence line, mesoscale cyclone and local circulation in Liupan Moutains area were the main triggering and enhancing systems of mesoscale convective systems (MCS), and also affected the movement direction of MCS. (2) When the large hail occured, the C-band radar composite reflectivity (Z) ≥ 65 dBZ, three-body scatter spike (TBSS) length ≥ 20 km, vertically integrated liquid water content (VIL) ≥ 40 kg·m-2. The cross-correlation coefficient (CC) in the high-value area of the low layer horizontal reflectivity (ZH) of X-band radar was less than 0.8, and the differential reflectivity (ZDR) and specific differential phase (KDP) of the mid to high layer ZH high-value area were negative and CC ＜ 0.8. (3) When the outsize hail occured, Z ≥ 70 dBZ, TBSS length ≥ 30 km, VIL ≥ 50 kg·m-2 for the C-band radar. CC in the low layer ZH high-value area of the X-band radar was less than 0.6 and the "hole" formed in the area with CC ＜ 0.5 helped to identify the area and altitude of outsize hail in the air. (4) ZDR columns and CC rings near the bounded weak echo zone could indicate the position of strong updrafts in the middle and upper layers of supercell. ZH and dual polarization parameter characteristics had good indicative significance for the identification and warning of different hail sizes.
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