The Department of Meteorology has confirmed that Kirindiwela in the Gampaha District recorded the highest rainfall across Sri Lanka in the past 24 hours, with a staggering 244 millimetres measured on Thursday, 21 May 2026. The intense downpour has raised concerns about localised flooding and landslides, particularly in low-lying and hilly areas of the Western Province.

Meteorological officials reported that the Kirindiwela area experienced exceptionally heavy rain within a short period, surpassing rainfall totals in other parts of the island. The sudden deluge comes amid an active southwest monsoon season, which typically brings heavy rains to Sri Lanka's western and southern coastal regions from May through September.

Southwest Monsoon Intensifies Across Western Province

The southwest monsoon has established itself firmly over the island, bringing widespread showers and thunderstorms to several districts. The Department of Meteorology had earlier issued warnings of heavy rainfall exceeding 150 mm in parts of the Western, Sabaragamuwa, and Central provinces. Kirindiwela's 244 mm record underscores the severity of current weather conditions.

Gampaha District, where Kirindiwela is located, is particularly vulnerable during the monsoon season due to its geography and rapid urbanisation. Poorly planned drainage systems and encroachments on waterways often exacerbate flooding when intense rains strike. Local authorities have been placed on high alert, and residents in flood-prone areas have been advised to monitor weather updates closely.

Flood and Landslide Warnings Issued

In response to the heavy rainfall, the Disaster Management Centre (DMC) has issued warnings for potential flooding and landslides in several districts, including Gampaha, Colombo, Kalutara, and Ratnapura. The DMC spokesperson urged residents in vulnerable areas to remain vigilant and avoid unnecessary travel during periods of heavy rain.

Landslides pose a significant risk in hilly regions where soil saturation levels are high. The National Building Research Organisation (NBRO) has identified several landslide-prone areas and called on local authorities to conduct evacuations if necessary. Emergency response teams have been deployed to assist communities at risk.

Impact on Daily Life and Infrastructure

The torrential rains have already disrupted daily life in parts of Gampaha District. Reports indicate waterlogging on several major roads, causing traffic delays and making commutes difficult for thousands of residents. Schools in affected areas were closed on Thursday as a precautionary measure, and some businesses faced temporary closures due to flooding.

Agricultural communities are also feeling the impact. Paddy fields and vegetable farms in low-lying areas have been inundated, raising fears of crop damage and economic losses for smallholder farmers. The Ministry of Agriculture has pledged to assess damage once weather conditions improve and provide relief to affected cultivators.

Meteorological Outlook for Coming Days

According to the latest forecasts from the Department of Meteorology, showers and thunderstorms are expected to continue across the Western, Sabaragamuwa, Central, Southern, and North-western provinces over the next few days. Heavy rainfall exceeding 100 mm is likely in some areas, particularly during the evening and night hours.

The public has been advised to stay indoors during thunderstorms and avoid bathing in rivers or streams, which can swell rapidly during heavy rains. Fishermen have also been warned of rough seas and strong winds along the western and southern coasts, with the potential for waves reaching heights of up to three metres.

Preparedness and Public Safety

The government has urged citizens to heed weather warnings and cooperate with local disaster management officials. The DMC has activated its 24-hour hotline for emergency assistance, and relief supplies have been pre-positioned in vulnerable districts. Community leaders have been briefed on evacuation procedures should conditions deteriorate further.

Climate experts note that extreme weather events, including intense rainfall over short periods, are becoming more frequent in Sri Lanka. This trend underscores the importance of strengthening disaster preparedness infrastructure and improving urban planning to mitigate flood risks.

As Kirindiwela records this significant rainfall milestone, attention remains focused on how authorities and communities respond to the ongoing monsoon challenges. Residents are encouraged to stay informed through official channels and take necessary precautions to protect life and property.

Source: Ada Derana