"After February 1, 2025, the intensity of the rain is expected to gradually decrease along with the weakening of the factors that trigger heavy rains," said BMKG Director of Public Meteorology Andri Ramdhani to reporters, Friday, January 31.

Meanwhile, until Friday, January 31 today, rain with moderate to heavy intensity can still occur in the Jabodetabek area, especially Jakarta.

"The trend of atmospheric models shows that the potential for rain will remain high, especially in the afternoon until the evening," said Andri.

As is known, the DKI Jakarta area and its surroundings were hit by heavy rains and resulted in dozens of RTs and roads in Jakarta being flooded since Tuesday, January 28, 2025.

On Tuesday, the highest rainfall was recorded at 386 mm per day and the lowest rainfall was 264 mm per day.

Andri said that heavy rains in Jakarta in recent days have been influenced by the interactions of various global, regional, and local atmospheric phenomena.

The main factors that contributed were the activity of the Equatorial Rossby Wave activity which was active and increased the formation of convective clouds in Indonesian territory.

Then, the negative outgoing longwave radiation (OLR) value shows that there are areas with strong convection activity. Then, the Asian Monsun which brings humid air masses from the northern hemisphere, strengthens the potential for heavy rain.

Sementara itu, pada faktor lokal, kelembapan udara yang tinggi (80–90 persen) di lapisan atmosfer 925–500 mb mendukung pertumbuhan awan hujan.

Kemudian, indeks labilitas atmosfer yang tinggi turut menunjukkan kondisi atmosfer yang mendukung pembentukan awan konvektif secara intensif. Efek konvergensi angin di sekitar Jakarta pun meningkatkan potensi pertumbuhan awan hujan.

"The combination of these factors creates atmospheric conditions that have strongly supported heavy rains in the last few days, thereby increasing the risk of inundation and flooding in Jakarta," he explained.


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