The National Environment Agency confirmed that hailstones were reported in central Singapore between 3.15pm and 3.45pm. They were seen mainly in Bishan, Toa Payoh and Ang Mo Kio.


It's believed the hailstones fell for about 20 minutes before subsiding. The last hailstone incident was reported in July 2007.
Hailstones form in intense thunderstorm clouds. Such clouds develop when there is strong convection, which occur all year round in the tropics. Generally, the hailstones would have been melted before they reach the ground. However, in the presence of a strong downdraft in an intense thunderstorm, the hailstones can be brought to the ground rapidly without melting.
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