The extreme rainfall events observed at the High-Altitude Cloud Physics Observatory (HACPO) in Rajamallay, Munnar (10° 9′19.94″N, 77° 1′6.65″E; 1820 m above MSL) over the southern Western Ghats (India) during the floods in 2018 and 2019 monsoon periods are investigated. The observations from Micro Rain Radar (MRR) and Ceilometer are used to analyze precipitation microphysics and the vertical distribution of clouds during the intense rainfall episodes on 14 - 16th August 2018 and on 8th August 2019. The drop size distribution (DSD) spectra during the 2018 event is characterized by a large number of small to medium-sized drops resulting in maximum reflectivity of 48dBZ with mass-weighted mean diameter (D_m) value of 1.2 mm. At the same time, the 2019 event is characterized by larger drops and resulted in high reflectivity of 53dBZ and D_m value shifted to 1.4 mm. The consistent increment of D_m and σ_m with slight variation in N_t during the intensive rain hours on 8th August 2019 shows a mixed-phase microphysical process that can invigorate the production of convective rainfall from deep cloud bands (217 K of cloud top temperature) with enhanced rain water content (22 gm⁻³). The parameters of scaled raindrop size distributions corresponding to higher rain rates (>50 mmhr⁻¹) suggest that the microphysical process that control the variations in DSD is strongly number controlled during these extreme rainfall events. The DSDs are evolved from a consistent, widespread rainfall supported by anomalous moisture advection from the Arabian Sea in 2018 monsoon period. The moisture convergence occurred on the elevated terrains leads to an intense spell of rainfall in two consecutive hours and satisfies the occurrence of a mini-cloud burst (MCB) event on 8th August 2019 causing flash flood in the region.

在西高止山脉（印度）南部蒙纳（10° 9′19.94″N，77°1′6.65″E；MSL 以上 1820 米）的高海拔云物理观测站 (HACPO) 观测到的极端降雨事件在 2018 年和 2019 年季风期间的洪水期间进行了调查。微雨雷达 (MRR) 和云高仪的观测结果用于分析 2018 年 8 月 14 日至 16 日和 2019 年 8 月 8 日强降雨期间的降水微物理和云的垂直分布。 2018 年事件的特点是大量中小型水滴，导致最大反射率为 48dBZ，质量加权平均直径（D _m) 值为 1.2 毫米。同时，2019 年事件的特点是降幅较大，导致 53dBZ 的高反射率和 D _m值偏移到 1.4 mm。_{在 2019 年 8 月 8 日的强降雨期间，D m}和 σ _m的一致增量与 N _t的轻微变化显示了一个混合相微物理过程，可以促进深云带产生对流降雨（云顶温度为 217 K ) 具有增强的雨水含量 (22 gm ^-3 )。对应于较高降雨率 (>50 mmhr ^{-1 ) 的按比例缩放的雨滴尺寸分布参数}) 表明控制 DSD 变化的微物理过程在这些极端降雨事件期间受到强烈的数量控制。DSD 是由 2018 年季风期间来自阿拉伯海的异常水分平流支持的一致、广泛的降雨演变而来的。高地发生的水分汇聚导致连续两个小时的强降雨，满足了 2019 年 8 月 8 日小型云爆发 (MCB) 事件的发生，导致该地区发生山洪。