Heavy rain in Islamabad and Rawalpindi early Wednesday has flooded low-lying areas and pushed water levels in Nullah Lai sharply higher, raising concerns about urban flooding.

The highest rainfall, 113 millimetres, was recorded in E-11 near Golra. Water at Kattarian on Nullah Lai reached 21.5 feet, while the level at Gawalmandi rose to 17.5 feet.

Authorities sounded warning sirens and directed residents in vulnerable areas to move to safer locations. Evacuation efforts have also started in Gawalmandi and Kattarian as officials monitor the situation.

Residents have been advised to avoid crossing streams, drains and other water channels because of the risk of strong currents and sudden rises in water levels.

The Pakistan Meteorological Department said intermittent rain was continuing in Islamabad, with partly cloudy conditions and further showers expected in some areas during the day.

The capital recorded a morning temperature of 26°C, while the maximum temperature is expected to reach 37°C. Humidity remained above 71%.

Rain with thunderstorms is also expected in Kashmir and upper Khyber Pakhtunkhwa, while partly cloudy weather is likely in Gilgit-Baltistan.

Meanwhile, Lahore remained hot, with temperatures around 32°C and a maximum of 36°C expected. The city may also receive rain.

Karachi remained humid and partly cloudy, with chances of drizzle. The temperature was recorded at 29°C, while the maximum is expected to reach 33°C to 35°C.

Southwesterly winds were blowing at 15 kilometres per hour, with humidity at 71%. The city’s air quality remained satisfactory, with pollutant levels below 100 particulate matter.