Flood Risks Driven by Land Conditions, Not Just Rainfall, Says MetMalaysia

The Malaysian Meteorological Department (MetMalaysia) has highlighted that flooding during the Northeast monsoon is influenced by more than just heavy rainfall. According to Ambun Dindang, the department’s deputy director general (operations), land-related factors such as changes in land use, rapid development, population density and the performance of local drainage systems play a major role in determining whether an area floods.

He explained on Bernama TV’s Ruang Bicara programme that areas experiencing similar rainfall levels to previous years may now react differently due to altered landscapes or urban expansion. Even with the same volume of rain, new developments, denser populations and modified drainage networks can significantly change flood outcomes. This is often seen across growing urbanised regions, especially in environments undergoing rapid transformation similar to commercial property zones in KL or newly developed areas near industrial land in Selangor.

Impact of Climate Change

Ambun added that global warming is intensifying weather patterns across the region. For every one degree increase in global temperature, the atmosphere can hold 7% more moisture, resulting in heavier and more intense downpours. Rising sea temperatures also contribute to coral bleaching, while melting glaciers and ice caps elevate sea levels — a serious concern for coastal nations like Malaysia.

He noted that recent increases in the intensity and frequency of typhoons hitting the Philippines and Vietnam also reflect the broader consequences of climate change.

Strengthening Early Warning Systems

To help Malaysia better prepare for extreme weather, MetMalaysia is continuously enhancing its early warning mechanisms. This includes strengthening its three key components: data collection, data processing, and public dissemination of information.

Weather models generally provide forecasts up to three days ahead, which Ambun described as the most reliable early-warning window. However, he stressed that atmospheric conditions can change rapidly, and updates will be issued whenever necessary so agencies have sufficient lead time to respond.

He also urged residents in flood-prone areas — including communities located near developing industrial and commercial zones such as the Subang area, Bukit Jalil and Puchong — to stay alert to weather advisories and follow instructions from authorities.

Where to Get Trusted Weather Updates

The public is encouraged to use official MetMalaysia platforms for accurate information, including its website, social media accounts and the MyCuaca mobile application.