JAKARTA, NETRALNEWS.COM - Dwikorita Karnawati, Head of the Indonesian Meteorology, Climatology, and Geophysics Agency (BMKG), has disclosed the four causes of extreme rain in Jakarta during an online press conference in Jakarta on Saturday (2/20/2021).
"The extreme rain occured due to a significant air movement that happened from February 18th to February 19th which caused an increase in rainfall in western part of Indonesia," Dwikorita said.
The second cause was wind bend and encounter from the north which coincidentally happened in Greater Jakarta. When the wind bended, it gets slowed down so that there is a cumulonimbus intensity form which is condensed to heavy rain.
The encounter of wind from the north with the wind from the Indian Ocean caused a block for the north. The block caused wind bend to the east and there was a deceleration above Greater Jakarta.
The deceleration, according to Dwikorita, caused the cumulonimbus intensity become condensed to rain.
The third cause was the highly unstable air dampness level in most of the west part of Java. It caused cumulonimbus above Greater Jakarta.
The last one was low-pressure centre in the northern part of Australia which formed a convergence in most of Java Islands. The low-pressure centre is predicted to continue until April.
"The phenomena happening in Java Island is caused by the wind encounter which is influenced by the low-pressure area formed in North Australia that makes convergence and cumulonimbus in half of Java and Greater Jakarta," she said.
Recently, half of Indonesia's areas including Greater Jakarta is still in the peak of the rainy season. Moderate rain and heavy rain are predicted to continue until the end of February or early March 2021.
BMKG has reported Halim Perdanakusuma, Sunter Hulu, Lebak Bulus, and Pasar Minggu areas experiencing extreme rain from February 19th at 07:00 Western Indonesian Time to February 20th at 07:00 Western Indonesian Time. The highest rainfall intensity happened in Pasar Minggu which reached 226 mm per day. Several areas in Greater Jakarta were inundated after the extreme rain.