TEMPO.CO, Jakarta - The National Disaster Management Agency (BNPB) reported an anomalous weather phenomenon, with light to heavy rain still falling in northern Indonesia and around the equator, despite the increasingly widespread dry season.
The Head of the BNPB Disaster Data, Information, and Communication Center, Abdul Muhari, said in Jakarta on Friday that the wet conditions were triggered by the activation of several global atmospheric dynamics and strong local air lability in these regions.
"Although the dry season is increasingly widespread, light to heavy rain still occurs in several regions of Indonesia, especially in the north and around the equator," he said.
BNPB confirmed that based on hydrometeorological data from late June to early July 2026, the highest anomalous rainfall was recorded in the Riau Islands, with an intensity of 81 mm per day.
Similar conditions were also observed in West Kalimantan, with rainfall reaching 76 mm per day, followed by Central Papua with 57 mm per day, and North Sumatra with 54 mm per day.
Abdul explained that rainfall during the dry season is strongly influenced by the activity of the Madden-Julian Oscillation (MJO) atmospheric waves, which actively move across parts of Papua.
Furthermore, the supply of water vapor, which triggers the growth of fertile rain clouds, is also attributed to Kelvin Waves in parts of Sumatra and Kalimantan, as well as the Equatorial Rossby Wave phenomenon in Papua.
These global-scale atmospheric factors are reinforced by the results of local condition analysis, which indicates a tendency for increased convective activity due to strong atmospheric lability around the equator.
Meanwhile, in other parts of Indonesia, macroclimate conditions actually show a dominance of hot weather triggered by the observed El Nino phenomenon in the Pacific Ocean.
The impact of this reduced rainfall is demonstrated by the presence of 493 observation points experiencing long rainless days, as well as spikes in maximum air temperatures exceeding 35 degrees Celsius in Lampung, Central Java, and East Kalimantan.
"All local governments and communities must increase their preparedness to anticipate the threat of drought, clean water crises, and wildfires. Use clean water wisely by prioritizing basic needs, such as cooking and drinking, and regularly inspect pipe installations to prevent leaks," he said.
Read: Indonesia Distributes Clean Water to Drought-Hit Regions
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