December 1, 2025 | 10:55 am
TEMPO.CO, Jakarta - The head of the Indonesian Meteorology, Climatology, and Geophysics Agency (BMKG), Teuku Faisal Fathani, stated that the tropical cyclone Senyar that caused flooding in Sumatra was due to anomalous weather.
Teuku mentioned that Indonesia is not generally prone to cyclones. Cyclones mostly occur in the north or the western Pacific waters. They are formed north of Papua, then pass through the Philippines and end up in the South China Sea. Hence, the Philippines can be affected by cyclones more than ten times a year.
Cyclones generally do not come close to the equator due to the weak Coriolis effect. Hence, cyclones do not form at the equator and only in areas with coordinates higher than 5 degrees north and 5 degrees south latitude.
However, an anomaly occurred due to atmospheric anomalies. Then, the weather became cold and so on. Thus, what we know as Cyclone Senyar was formed in the Malacca Strait," said Teuku during a cross-ministerial coordination meeting at the Ministry of Home Affairs, Jakarta, on Monday, December 1, 2025.
Meanwhile, the warm temperature in the Malacca Strait formed a lot of rain clouds. Thus, even the lowest category of Cyclone Senyar could cause a significant disaster.
Teuku stated that the cyclone was trapped between the highlands of Sumatra and the Malay Peninsula and rotated there. As a result, heavy rain occurred for more than two or three days.
"In Langsa Post, it recorded 380 millimeters of rain, which is the amount of rain for an entire month falling in one day," said Teuku. "So, we can imagine how severe the disaster we experienced in the previous Cyclone Senyar."
Teuku warned that cyclone seeds might occur during the Christmas and New Year holiday period in the southern regions. Cyclone seeds sometimes appear and disappear. However, there have been cases where cyclone seeds develop into cyclones.
"The regions that need to be on alert for the growth of cyclone seeds and their development into cyclones are Bengkulu, Lampung, Banten, DKI Jakarta, Java, Bali, West Nusa Tenggara, East Nusa Tenggara, Maluku, as well as South and Central Papua. The impact can be direct or indirect," said the head of BMKG.
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