SINGAPORE - Heavy rains and strong winds felled trees and flooded a shopping mall over the weekend, with the wet weather expected to continue into this week.

On Sunday afternoon, the National Environment Agency warned of "heavy thundery showers with gusty wind" over the north and east of the island, as Singapore faces the annual north-east monsoon.

The PUB also noted that water levels had risen above 90 per cent in canals at Leng Kee Road and Prince Philip Avenue, with a "high flood risk". Though the water levels fell back below the 90 per cent mark shortly afterwards, the high flood risk remained.

There was indeed a flood of sorts, in the east - though not due to canals bursting their banks. Water pooled on the second and third levels of Tampines Mall, after its rooftop drainage system could not handle an afternoon downpour.

The rainwater inlet, which helps channel rainwater from the mall's roof to external drainage, could not cope with the "unusually heavy amount of rainfall" and overflowed, said the mall's marketing communications manager Sarah Lua in a statement.

The flood was cleaned up by 4.25pm, and Tampines Mall is putting steps in place to prevent a recurrence," she added.

The wet weather looks set to continue this week, with the National Environment Agency forecasting thundery showers over many areas in the afternoon on Monday.

Tuesday's forecast is for passing showers in the afternoon. While Wednesday is set to be "occasionally windy", Thursday will see a return to thundery showers in the afternoon.