Singapore, large sections of Ayer Rajah Expressway near Clementi, Commonwealth Avenue, South Bridge Road, Tomlinson Road and Alexandra area. This led to a complete closure of a section of AYE towards the city. The Commonwealth area was most seriously affected by the flash floods. Shortly after, PUB announced plans to upgrade the Sungei Pandan Kechil and Commonwealth Avenue, the former covering the affected area of AYE. Sunday, 20 October 2013 Heavy rain over the eastern and central parts led to flash floods at Paya Lebar Road (under PIE-Paya Lebar flyover), Service Road off Upper Paya Lebar Road (near Lim Teck Boo Road), Arumugam Road and Ubi Ave 2, Eunos Crescent, junction of MacPherson Road and Harvey Road, PIE (towards Changi Airport) slip road at Stevens Rd Exit and Thomson Road near Novena Rise. The flash floods subsided within 30 minutes, except for the flood at Arumugam Road which subsided within one hour. Monday, 28 October 2013 Flash floods hit Chai Chee after a heavy downpour in the afternoon, leaving some vehicles stranded. The flood at the junction of New Upper Changi Road and Chai Chee Road made the roads, at one point, impassable to traffic. The waters subsided in half an hour. By 5pm, the road was once more passable for traffic. Wednesday, 30 October 2013 Vehicles were left stranded at the junction between Chai Chee Road and New Upper Changi Road after the area was flooded again. Heavy rain also caused flash floods at the same junction on Monday, 28 October. Sunday, 3 November 2013 and Monday, 4 November 2013 On Sunday, heavy rain caused flash floods in Chai Chee again in the afternoon, leaving some vehicles stranded. Heavy rain also caused flash floods in the same junction on Wednesday, 30 October and Monday, 28 October. On Monday, flash floods were reported at a number of locations following heavy rain in the afternoon. Affected areas were Dunearn Road (between Yarwood Avenue and Binjai Park), junction of Sunset Drive and Sunset Square, slip road from Clementi Road to Ulu Pandan Road, junction of Clementi Avenue 4 and Commonwealth Avenue West, and Lorong Kismis. The slip road from Clementi Road to Ulu Pandan Road was not passable to traffic for 15 minutes. The heaviest rainfall was recorded at Ngee Ann Polytechnic rain gauge station, at 86.6mm from 3 pm to 4.40 pm. It peaked between 3.30 pm to 4 pm, with