Rossby And Kelvin Waves Trigger Extreme Weather In NTB In The Next Week

MATARAM - The Meteorology, Climatology and Geophysics Agency (BMKG) released information related to the potential for extreme weather, which was marked by an increase in rainfall throughout the West Nusa Tenggara (NTB) region from 11 to 16 December 2025.

"The analysis of atmospheric dynamics shows that there are a number of significant disturbances that trigger extreme weather," said Head of the NTB Meteorological Station, Satria Topan Primadi, quoted by Antara, Thursday, December 11.

Based on the results of BMKG monitoring, Rossby's Equatorial wave activity and Kelvin waves were detected as actively crossing the West Nusa Tenggara region. Both atmospheric waves can increase the formation of rain clouds and trigger extreme weather.

BMKG also reported that there was a wind meeting zone or convergence above West Nusa Tenggara and a cyclonic wind pattern in the southern region of the province. This condition strengthens the process of convective cloud formation which has the potential to produce heavy rain, lightning, and strong winds.

Another factor of atmospheric disturbance is the humidity of the air at various levels of altitude which is observed to be wet, thus supporting the growth of rain clouds.

Satria revealed that the current strong atmospheric liabilities allow the rapid development of the comulonimbus cloud on a local scale.

According to him, the four factors of atmospheric disturbances are able to increase the potential for the growth of cumulonimbus clouds in most parts of West Nusa Tenggara.

"This condition has the opportunity to trigger moderate to heavy rain which can be accompanied by lightning, lightning, and strong winds," he said.

In addition to increasing rainfall, BMKG reports that there is the potential for high waves to reach 1.25 meters to 2.5 meters in the southern Lombok Strait, the southern part of the Alas Strait, and the southern Indian Ocean waters of the West Nusa Tenggara region.

People who live and work in disaster-prone areas are advised to continue to be vigilant and alert, especially when heavy rains occur to anticipate impacts, such as floods, flash floods, tidal floods, landslides, strong winds, tornadoes, lightning strikes, and fallen trees.