JSTMC 2021. Preface JSTMC Vol. 22 No. 2 December 2021: Foreword and Acknowledgement. Jurnal Sains & Teknologi Modifikasi Cuaca. 22, 2 (Dec. 2021), iii-v. DOI:https://doi.org/10.29122/jstmc.v22i2.5167.