JAKARTA - The DKI Jakarta area and its surroundings have been hit by heavy rains and have caused dozens of RTs and roads in Jakarta to be 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.
Director of Public Meteorology of the Meteorology, Climatology and Geophysics Agency (BMKG) Andri Ramdhani revealed a number of factors that have caused high rainfall in Jakarta recently.
"The heavy rains in Jakarta in recent days have been influenced by the interactions of various global, regional and local atmospheric phenomena," Andri told reporters, Friday, January 31.
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.
Not only that, but the call for coldness from Siberia strengthens Asian Monsoons and increases air humidity in Indonesia, especially in the Greater Jakarta area.
"The significant Cross-Equatorial Northernly Surge (CENS) on January 27, 2025 also supports water vapor transportation from the western Pacific Ocean to Indonesia," explained Andri.
Meanwhile, at local factors, high humidity (80'90 percent) in the atmospheric layer of 925'500 mb supports the growth of rain clouds.
Then, the high atmospheric lability index also shows atmospheric conditions that support intensive convective cloud formation. The effect of wind convergence around Jakarta also increases the potential for rain cloud growth.
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"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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