December 31, 2025 | 04:18 pm
TEMPO.CO, Jakarta - The Meteorology, Climatology, and Geophysics Agency (BMKG) has denied social media claims that Jakarta is on "Alert One" status following the detection of a massive Squall Line phenomenon heading towards Java. The agency clarified that it has not issued any such early warnings.
"The information regarding a Squall Line detection circulating on social media is not an official release from BMKG," said Andri Ramdhani, Director of Public Meteorology at BMKG, when contacted today, Wednesday, December 31, 2025.
The term 'squall line' refers to long, continuous stretches of rain clouds moving in a line. Massive cumulonimbus cloud lines can trigger extreme weather, which led to the viral social media question: "New Year's Eve Threatened by Extreme Storm?"
While Andri dismissed the rumor, he still urged the public to remain cautious. He explained that atmospheric conditions in the Jabodetabek area are currently influenced by the Asian Monsoon, which carries humid air. This is being reinforced by a cold surge from Asia and Rossby equatorial waves traversing Java.
Additionally, there is an indirect influence from tropical cyclone seed 90S in the Indian Ocean, southwest of Lampung. Andri noted that this has led to convergence zones and wind deceleration (convergence) stretching from southern Sumatra to western Java, including Greater Jakarta or Jabodetabek.
"These atmospheric conditions increase the potential for rainfall in Jabodetabek. People are advised to stay vigilant against weather changes and potential hydrometeorological disasters as we approach the 2026 New Year," he added.
Andri urged the public to rely on official weather information via the InfoBMKG application, the website www.bmkg.go.id, or official BMKG social media accounts. He also advised people to stay aware of local weather risks. "Activity plans should be adjusted for potential heavy rain, strong winds, and high waves during New Year celebrations."
Impact of Tropical Cyclone Seed 90S Beyond Jakarta
Satellite image map of tropical cyclone seed 90S on December 31, 2025 at 07:00 WIB. Documented by BMKG
Tropical cyclone seed 90S began developing on December 29, 2025, in the Indian Ocean, southwest of Lampung. As of Wednesday morning, the system's circulation center was moving southeast.
According to BMKG satellite imagery from December 31, 2025, at 07:00, tropical cyclone seed 90S will continue to indirectly impact Indonesian weather and waters until Thursday morning, January 1, 2026:
Moderate to heavy rain with strong winds: Bengkulu, South Sumatra, Lampung, Banten, Jakarta, and West Java.
Strong winds: Bengkulu, South Sumatra, Lampung, Banten, and West Java.
Moderate waves (1.25 - 2.50 meters): Indian Ocean west of Bengkulu, waters west of Bengkulu, Indian Ocean south of Yogyakarta, and waters south of West Java and Yogyakarta.
- High waves (2.5 - 4.0 meters): Indian Ocean south of Lampung, waters south of Lampung, the southern Sunda Strait, and southern waters from Banten to Central Java.
Read: This BMKG App Lets You Track Weather for Holiday Travel in Indonesia
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