HEYBALI.NEWS – Several coastal areas across Bali are facing an elevated risk of tidal flooding in early January, as a rare alignment between the moon and the Earth is expected to push sea levels higher than usual, Indonesia’s meteorological agency has warned.
The Meteorology, Climatology and Geophysics Agency (BMKG) issued an early advisory for maximum tidal conditions expected between 1 and 6 January 2026, citing a combination of astronomical events that could intensify coastal inundation, known locally as rob.
According to the agency’s Regional Office III, the warning is linked to the Perigee phase, when the moon reaches its closest point to Earth, occurring on 2 January, followed by a full moon on 3 January.
Together, these phenomena are expected to amplify tidal forces along parts of Bali’s coastline.
“This alignment has the potential to increase maximum sea levels in several coastal areas,” said Cahyo Nugroho, head of BMKG Regional Office III, in a statement released on 31 December. “The impact may vary by location and timing, but heightened vigilance is necessary.”
Areas Most at Risk
BMKG identified several regions that may be affected by unusually high tides, particularly along Bali’s southern coastline. These include:
- Southern Tabanan
- Badung Regency
- Denpasar City
- Gianyar Regency
- Southern Klungkung
- Southern Karangasem
- Southern Jembrana
The agency noted that the timing of peak tides will differ across locations, with flooding possible at varying hours throughout the warning period.
Potential Disruptions
While the phenomenon is driven by predictable celestial mechanics, its consequences on land can be disruptive. BMKG warned that elevated sea levels could interfere with daily life and economic activity in coastal zones, including:
- Port operations and cargo loading
- Coastal residential areas
- Salt farming and inland fisheries
- Tourism-related activities near beaches and harbors
In low-lying areas, seawater may temporarily inundate roads, courtyards, or traditional fishing facilities, particularly during peak tidal hours.
Advisory for Residents and Visitors
Authorities are urging residents, business operators, and travelers in coastal areas to remain alert and prepared. Those living or working near the shore are advised to monitor tidal conditions closely and take precautionary measures to reduce potential losses.
BMKG also encouraged the public to follow official updates through its regional information services, website, social media channels, and the INFO BMKG mobile application, which provides real-time weather and maritime alerts.
The early warning, officials said, is part of a broader mitigation effort aimed at minimizing disruption and ensuring public safety during predictable but potentially impactful natural events.
For Bali, an island where the rhythm of life is closely tied to the sea, the advisory serves as a reminder that even familiar natural cycles can carry heightened risks when conditions align.