Cyclonic Circulation Triggers Heavy Rain and Strong Wind Warnings Across Indonesia
The Meteorology, Climatology and Geophysics Agency (BMKG) has released an early warning for significant weather valid for Thursday, 25 June 2026. The forecast indicates that the formation of a cyclonic circulation in the Pacific Ocean is triggering the concentration of rain clouds and increasing the potential for strong winds in several parts of Indonesia.
Analysis of atmospheric dynamics shows a cyclonic circulation system in the Pacific Ocean northeast of Papua. This condition forms areas of wind convergence and deceleration extending from the Papua region, Papua Pegunungan, the Pacific Ocean north of Papua, to around the centre of the circulation.
The combination of the cyclonic circulation, convergence zones, and confluence areas is forecast to increase the growth of rain clouds in several regions. The public is urged to heighten vigilance against the potential for moderate to heavy rain, strong winds, and the accompanying hydrometeorological impacts.
In the daily early warning map, BMKG has categorised several areas under alert status for potential moderate to heavy rain. These regions are likely to experience rain with moderate to heavy intensity. Residents in areas prone to flooding, landslides, and waterlogging are asked to pay attention to their surrounding environment, especially during prolonged rainfall.
In addition to the rain potential, BMKG has also noted strong wind warning zones. Residents in these areas need to be wary of the potential for fallen trees, collapsed billboards, and disruptions to local shipping and aviation activities. Road users are also advised to exercise caution when passing through open areas or locations with many trees.
The cyclonic circulation forecast to form in the Pacific Ocean northeast of Papua is one of the main factors influencing weather conditions. The system creates meeting areas and wind deceleration in the Papua region and its surroundings.
Furthermore, convergence zones are observed forming in the Indian Ocean west of Sumatra, the northern waters of Aceh, West Kalimantan, and Central Kalimantan. These convergence zones can support the formation of rain clouds, particularly if supported by sufficient atmospheric humidity.
Confluence areas are also forecast to extend widely across the Flores Sea, the Malacca Strait, the waters of the Riau Islands, the waters of the Bangka Belitung Islands, the Karimata Strait, the Natuna Sea, the South China Sea, the Makassar Strait, the Halmahera Sea, to the northern waters of Papua.
These conditions can generally increase the likelihood of rain cloud growth in the affected areas. Consequently, weather changes can occur relatively quickly, especially from afternoon to evening in regions under alert status.
The public is asked to remain vigilant against the potential for extreme weather and hydrometeorological impacts such as flooding, landslides, waterlogging, fallen trees, and transport disruptions. Vigilance also needs to be heightened by residents living on riverbanks, hillsides, coastal areas, and disaster-prone zones.
Motorists are advised to reduce speed during rain, maintain a safe distance, and avoid sheltering under large trees during strong winds. Fishermen and marine transport operators also need to pay attention to wind and wave conditions before carrying out activities.
To obtain regular weather information updates, the public can monitor BMKG information channels, including the website bmkg.go.id and the social media account @infobmkg.