Two different mesoscale convective system (MCS) events that produced the heavy rainfall over the Greater Jakarta (GJ) during 15–18 January 2013 period were investigated. The purpose of the present study is to analyze the atmospheric conditions of two different MCSs during the heavy rainfall. Data consist of 3 hourly rainfalls of meteorological stations, infrared satellite, sounding, 6-hourly surface wind and reanalysis data. The first MCS was developed at 16:00 LT on 14 January 2013 over the eastern coast of Sumatra covered an area of 249,732 km2 at maximum size, with about 16 h durations. The next MCS was developed at 22:00 LT on 16 January 2013 over the northern coast of the GJ in 9 h of duration, and maximum covered area around 55,829 km2. A warmer and moist air was observed on the low-level layer in the evening of 16 January 2013 (prior of second MCS), in comparison to 14 January 2013 event. Combination of both the surface strong wind perturbation and equivalent potential temperature in the second MCS might be contributed to heavy rainfall over the GJ than the first one.

中文翻译：

---

大雅加达两个中尺度对流系统（MCSs）的特征：2013年1月15日至18日为强降雨期

研究了两次不同的中尺度对流系统（MCS）事件，这些事件在2013年1月15日至18日期间在大雅加达（GJ）产生了大雨。本研究的目的是分析暴雨期间两种不同MCS的大气条件。数据包括气象站的3小时降雨，红外卫星，测深，6小时的地面风和再分析数据。第一个MCS于2013年1月14日16:00 LT在苏门答腊岛东海岸开发，最大面积为249,732 km2，持续时间约16小时。下一个MCS于2013年1月16日LT 2 LT在GJ北部海岸开发，持续时间为9小时，最大覆盖面积约55,829 km2。与2013年1月14日的事件相比，2013年1月16日晚上（第二MCS之前）在低层观测到了温暖潮湿的空气。与第一个MCS相比，第二个MCS中的表面强风扰动和等效潜在温度的共同作用可能会导致GJ上的大雨。