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Banjir Bandang, North Luwu, Lapan Reveal Season Anomaly
19 Jul 2020 • Read : 579 x ,

The National Institute of Aviation and Space Research (Lapan) research team analyzed heavy rain followed by flash floods in North Luwu, South Sulawesi, on July 13, 2020. The rain that occurred was related to anomalous season called wet dry season.

Before the flash floods it rained persistently or continuously from 12 July afternoon until 13 July morning. Rain continues with moderate intensity in the afternoon until the afternoon. "Daily rainfall accumulation based on monitoring of the GSMap rain satellite on July 13, 2020 reached 60 millimeters," said Erma Yulihastin, Lapan Climatology researcher, Saturday, July 18, 2020.

Persistent rain during the dry season in South Sulawesi is unusual. It is estimated that such peak peaks occur in April and December. "This shows the condition of the season's anomaly called wet drought," he said through a written statement.

The team which also consisted of Wendi Harjupa as the Coordinator of the Lapan Disaster Reaction and Analysis Team (TREAK) and Lapan's meteorology professor Eddy Hermawan discovered other facts. Based on the weather prediction of Satellite-Based Disaster Early Warning System (SADEWA) - Eight, the persistent rain is concentrated around Bone Bay.

The strengthening of the monsoon that brings moisture then occurs because of the warming of sea surface temperatures in Bone Bay and the formation of low pressure circulation in the Makassar Strait. The concave shape of the coastline contributes to the concentration of diurnal or daily rains around the Gulf of Bone or Luwu.

This year's dry season, according to the Lapan team, was triggered by three main factors. First, the phenomenon of the area of the meeting of anthropical air masses or known as the Intertropical Convergence Zone (ITCZ), which often forms from May to July.

The second factor is atmospheric wave activity that travels from north to south associated with summer activity called the Boreal Summer Intra-seasonal Oscillation (BSISO) in the Indian Ocean on July 12-13. This phenomenon affects the formation of broad convergence extending from the Indian Ocean to the Sulawesi region.

Third, warming of sea surface temperature in Indonesia's local waters is concentrated in the Maluku Sea, Arafuru and Bone Bay. Lapan season predictions indicate the Sulawesi region must still be on the alert for potential extreme events until mid-July. While starting in August Sulawesi will be drier and wet again with the potential for extreme rain in September 2020.

News source: Tempo.

Cover image source: IPRC - University of Hawaii.

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