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Abstrak (Bhs. Indonesia)

Indonesia menjadi salah satu negara dengan curah hujan dan sambaran petir cukup tinggi. Salah satunya wilayah Cilacap yang terletak di pesisir selatan Provinsi Jawa Tengah. Fenomena petir (Thunderstorm) merupakan fenomena meteorologis dengan dampak cukup besar sehingga perlu dilakukan prakiraan potensi terjadinya Thunderstorm. Pada penelitian ini dilakukan analisis dua metode yaitu nilai indeks labilitas atmosfer (T-Indeks, K-Indeks, SWEAT Indeks) dan citra satelit Himawari-8 untuk memprakiraan potensi terjadinya thunderstorm selama Januari 2021 – Desember 2022 yang nantinya kedua metode tersebut dihitung persen kesesuaiannya menggunakan logical array mathlab. Data nilai indeks labilitas atmosfer didapatkan dari data radiosonde website weather uwyo dan citra satelit Himawari-8 diperoleh dari Stasiun Meteorologi Kelas II Yogyakarta. Waktu pengukuran pada pukul 00 UTC, dimana data radiosonde dengan menggunakan Software Rawinsonde Observation (RAOB) Versi 5.7 dan citra satelit Himawari-8 diinterpretasi suhu puncak awan perharinya. Berdasarkan penelitian yang telah dilakukan, wilayah Cilacap diketahui rentang nilai T-Indeks, K-Indeks, SWEAT-Indeks secara berturut-turut sebesar 44,84 s.d 49,8 ; 28,9 s/d 66,9 ; 205 s/d 335. Berdasarkan suhu puncak awan citra satelit Himawari-8 diduga adanya awan cumulonimbus sebagai syarat terjadinya thunderstorm dihasilkan suhu puncak awan ≤ -60°C sebesar 62,2%. Verifikasi antara dua metode menghasilkan persen kesesuaiannya sebesar 57,25% s/d 76,33% dimana antara T-Indeks, K-Indeks, SWEAT Indeks dengan suhu puncak awan secara berturut-turut sebesar 57,5 % ; 76,33% dan 64,59%.

Abtrak (Bhs. Inggris)

Indonesia is one of the countries with quite high rainfall and lightning strikes. One of them is the Cilacap area which is located on the south coast of Central Java Province. The phenomenon of lightning (Thunderstorm) is a meteorological phenomenon with a large enough impact that it is necessary to predict the potential occurrence of a Thunderstorm. In this study, two methods were analyzed, namely atmospheric lability index values (T-Index, K-Index, SWEAT Index) and Himawari-8 satellite imagery to predict the potential for thunderstorms during January 2021 - December 2022. Later these two methods calculated the percent conformity using a mathlab logical array. Data on atmospheric lability index values were obtained from radiosonde data from the weather website Uwyo and Himawari-8 satellite imagery obtained from the Yogyakarta Class II Meteorological Station. The measurement time is at 00 UTC, where radiosonde data using the Rawinsonde Observation (RAOB) Software Version 5.7 and Himawari-8 satellite imagery are interpreted as the temperature of the cloud tops per day. Based on the research that has been done, it is known that the range of T-Index, K-Index, SWEAT-Index in Cilacap area is 44.84 to 49.8; 28.9 to 66.9 ; 205 to 335. Based on the cloud top temperature of Himawari-8 satellite imagery, it is suspected that the presence of cumulonimbus clouds as a condition for the occurrence of a thunderstorm produces a cloud top temperature of ≤ -60°C of 62.2%. Verification between the two methods resulted in a conformity percentage of 57.25% to 76.33% where the T-Index, K-Index, SWEAT Index and cloud top temperature were respectively 57.5%; 76.33% and 64.59%.

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