Analysis of the rainfall event in 2018-2019 using the air stability index method at the Meteorological Station of Sultan Iskandar Muda Banda Aceh

Abstract The purpose of the present research is to determine the forecast of rain events with good results and can provide information on rain events to be right on target. In this study, an analysis of rainfall events in 2018 and 2019 was carried out using rainfall and radiosonde data at the Meteorological Station of Sultan Iskandar Muda Banda Aceh. The analysis used with the atmospheric stability index method, which was taken by Radiosonde data, obtained information on atmospheric parameters such as temperature, dew point, pressure, and wind. This parameter can be used to predict rain events using the air stability index, where the indices used are Showalter Index (SI), Lifted Index (LI), CAPE, Total-Total Index (TT), K-Index, Severe Weather Threat Index (SWEAT). From the results of the stability indices verified by rainfall data observed by the Meteorological Station of Sultan Iskandar Muda. The results showed that the LI, SI, TT, and KI indices were good enough to predict rainfall, while the CAPE and SWEAT indices were still not good at predicting rainfall events. This information can then be used as a basic reference which is quite good to use through the upper air stability index approach in develop the rainfall forecast value.