BMKG's Explanation Of Tropical Cyclone Seeds 91S

JAKARTA - The Meteorology, Climatology and Geophysics Agency (BMKG) appealed to the public to remain calm while increasing vigilance in the face of the development of the 91S tropical cyclone seed currently in the Indian Ocean west of Lampung province.

"The public must also be aware of the potential for an increase in wave height in the Indian Ocean, starting from the west of Nias to the south of Banten, as well as in the waters of the southern Sunda Strait," said Head of BMKG Teuku Faisal Fathani as reported by ANTARA, Wednesday, December 10.

It is known, the results of the BMKG analysis noted that the seeds of tropical cyclone 91S have the potential to have an indirect impact on the intensity of rainfall in parts of Sumatra. The current dynamics of the atmosphere, according to Faisal, affects the intensity of rain in the Sumatra region, and the Cyclone 91S Seeds have the potential to trigger an increase in rainfall with moderate to heavy intensity in parts of Aceh, North Sumatra, West Sumatra, Bengkulu, and Lampung.

BMKG then conveyed that the potential of 91S to develop into tropical cyclones and enter mainland areas, such as Tropical Senyar Cyclone, is in the low category.

Therefore, BMKG urges people in affected areas to remain calm, not panic, and continue to update weather information from BMKG in real-time.

Meanwhile, Deputy for Meteorology of BMKG Guswanto explained that based on the latest analysis, the movement of 91S is predicted to tend to move south to southwest from December 11, 2025 in the afternoon or evening. Furthermore, the system is expected to begin showing a consistent movement pattern to the southwest, away from Indonesian territory on December 12, 2025.

"The Central BMKG together with the Provincial BMKG have coordinated with BNPB and BPBD in affected areas to ensure that mitigation measures run optimally according to weather potential conditions influenced by the presence of 91S," said Guswanto.

BMKG Director of Public Meteorology Andri Ramdhani appealed to the public, especially in the west-south coast of Sumatra to the Banten region, to be aware of the potential for heavy rain, strong winds, and high waves. Then related to the shipping, fisheries, and sea transportation sectors, it is encouraged to adjust their operational activities based on the warnings of the applicable high waves.

Local governments also through BPBD are asked to ensure preparedness for the potential for flooding and other weather disturbances. BMKG views solid cross-sectoral collaboration as the main key to creating harmony between early warning systems and early action.

"This synergy ensures that threat information is received quickly and is followed up effectively by all parties, so as to be able to mitigate risks and achieve maximum public safety," said Andri.