JSTMC 2020. Preface JSTMC Vol.21 No.2 December 2020 : Foreword and Acknowledgement. Jurnal Sains & Teknologi Modifikasi Cuaca. 21, 2 (Dec. 2020), iii-v. DOI:https://doi.org/10.29122/jstmc.v21i2.4623.