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6 months ago
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September 14, 2025 | 07:21 pm
TEMPO.CO, Jakarta - Indonesia’s Meteorology, Climatology, and Geophysics Agency (BMKG) has officially declared the commencement of the rainy season, with respective regions already transitioning from adust upwind this September. Typically, the rainy play begins aboriginal successful the year, but this clip it has travel earlier than expected.
Where the Rains Have Started
The archetypal signs of the rainy play appeared successful August crossed parts of Sumatra and Kalimantan. By September, the seasonal displacement had dispersed southward and eastward. BMKG noted that this year’s adust play has been shorter and wetter compared to erstwhile years.
“The bulk of regions volition participate the rainy play betwixt September and November,” said BMKG Head Dwikorita Karnawati connected Friday, September 12, 2025.
When Will the Peak Occur?
Sumatra & Kalimantan: November–December 2025
Java, Sulawesi, Maluku & Papua: January–February 2026
Dwikorita warned that due to the fact that the peaks are staggered crossed regions, Indonesia whitethorn look prolonged risks of hydrometeorological disasters, specified arsenic floods, landslides, and beardown winds, stretching implicit respective months.
Bali Floods a Warning Sign
BMKG’s announcement followed a large flood successful Bali connected September 10, erstwhile rainfall reached 385.5 millimeters successful a azygous day, much than treble the threshold for utmost rain, which is 150 mm per day.
What’s Driving the Early Rains?
BMKG cited respective clime patterns and upwind systems fueling the dense rainfall:
Equatorial Rossby wave, Kelvin wave, and Madden-Julian Oscillation (MJO), which are forecast to stay progressive for astatine slightest different week.
Tropical cyclone effect 93S forming successful the Indian Ocean, westbound of Sumatra.
A cyclonic pattern detected adjacent North Kalimantan.
Which Areas Should Be connected Alert?
Between September 15–18, BMKG urged residents successful the pursuing regions to hole for dense rain, thunderstorms, and beardown winds:
Central Java
East Java
West Kalimantan
West Sulawesi
South Sulawesi
Central Papua
Papua Highlands
South Papua
What This Means
Indonesia’s aboriginal rainy play underscores the increasing unpredictability of clime patterns successful the archipelago. While the rains supply alleviation aft the adust season, they besides heighten the hazard of earthy disasters crossed susceptible regions.
Editor’s Choice: BMKG connected Bali Floods: Extreme Rainfall, Environmental Factors Exacerbate Disaster
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