Abstract:To obtain the X-band dual-polarization radar characteristics of hail in southwestern Yunnan, a statistical analysis method is used to analyze 22 hail sample data detected by the Menglian X-Band Dual-Polarization Radar. The results show that hailstorm cells have maximum horizontal reflectivity factor (ZH) ≥58 dBz, 45 dBz echo height (H45) ≥7.1 km, with a height difference between H45 and the wet-bulb 0℃ level being ≥3.3 km. H45 above 86% of hail cells have exceeding the height of the -20℃ layer. 50 dBz echo height (H50) is ≥5.7 km, with a height difference between H50 and the -20℃ level ranging from -1.2 km to 2.7 km. Vertical integrated liquid water content (VIL) density is ≥2.8 g·m-3, and the VIL is increased by 4.7-18.3 kg·m-2 in the volume scan preceding hailfall. When differential reflectivity (ZDR) and specific differential phase (KDP) average and median values are above 0℃ layer, they are concentrated near the value of 0 dB and 0 °·km-1, predominantly being negative. Below 0℃ layer within 1 km, they change from negative to positive values, gradually increasing with the height decrease. The maximum values appear in the near-surface layer, reaching approximately 1.5 dB and 0.7 °·km-1 respectively. The ranges of values for parameters above the 0℃ layer are: ZDR from -1.92 dB to 1.35 dB, KDP from -1.97 °·km-1 to 1.29 °·km-1, and correlation coefficient (CC) from 0.86 to 0.99, while below the 0℃ layer, ZDR from -1.92 dB to 3.74 dB, KDP from -2.98 °·km-1 to 2.66 °·km-1, and CC from 0.79 to 0.98. The research results could be a reference for the detection and identification of hail characteristics by the X-band dual-polarization radar in the southwestern Yunnan Region.