OVERSHOOTING TOP OF CONVECTIVE CLOUD IN EXTREME WEATHER EVENTS OVER JAVA REGION BASED ON VISUAL IDENTIFICATION OF HIMAWARI 8 IMAGERY

Authors

  • Bony Septian Pandjaitan IPB University; Indonesia Agency for Meteorology Climatology and Geophysics
  • Akhmad Faqih IPB University
  • Furqon Alfahmi Indonesia Agency for Meteorology Climatology and Geophysics
  • Perdinan . IPB University

DOI:

https://doi.org/10.31172/jmg.v24i1.967

Keywords:

convective cloud, extreme weather, Himawari 8 satellite, overshooting top.

Abstract

Overshooting top (OT) in convective clouds is an essential feature in extreme weather nowcasting performed by weather forecasters to represent the core location of the severe region of the convective cloud. In addition, we can estimate the location of extreme weather events by utilising OT climatology. Unfortunately, it cannot be realised in tropical Indonesia, especially on Java Island at present, because there still needs to be more research on the presence of OT in extreme weather events. This research aims to study the presence of OT in extreme weather events on Java Island using extreme weather reports and the Himawari 8 satellite data. We detect the presence or absence of OT patterns at the location of the extreme weather event with Visual identification by using a visible channel (0.64 μm) with a spatial resolution of 500 m and sandwich products. We found that about 87% of extreme weather occurred accompanied by the appearance of OT patterns from convective clouds. A parallax effect of Himawari 8 caused the detected OT location in the southwest direction of the actual location. Extreme weather events accompanied by the OT feature of convective clouds most often occur in the transitional period of the rainy to dry season (MAM) and the rainy season (DJF). Meanwhile, extreme weather events rarely occur during the dry season (JJA). Extreme weather events accompanied by OT often occur from midday to late afternoon. OT in this study has a diameter between 2-15 km during extreme weather events. A time lag between the appearance of OT and extreme weather events in Java Island gives us opportunities for approximating and nowcasting the extreme weather events.

Author Biography

Bony Septian Pandjaitan, IPB University; Indonesia Agency for Meteorology Climatology and Geophysics

Student in Master degree program for Applied Climatology IPB University;

Meteorologist in Sub division for weather satellite imagery management,Indonesia Agency for Meteorology Climatology and Geophysics 

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Published

2023-08-28 — Updated on 2024-02-02

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How to Cite

Pandjaitan, B. S., Faqih, A., Alfahmi, F., & ., P. (2024). OVERSHOOTING TOP OF CONVECTIVE CLOUD IN EXTREME WEATHER EVENTS OVER JAVA REGION BASED ON VISUAL IDENTIFICATION OF HIMAWARI 8 IMAGERY. Jurnal Meteorologi Dan Geofisika, 24(1), 53–64. https://doi.org/10.31172/jmg.v24i1.967 (Original work published August 28, 2023)

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Vol. 24 No. 1 (2023)

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Copyright (c) 2023 Bony Septian Pandjaitan, Akhmad Faqih, Furqon Alfahmi, Perdinan .

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