Many parts of Singapore was flooded on Jan. 8, 2018 morning.

So heavy was the precipitation that about half of Singapore's average monthly rainfall in January fell in the Kim Chuan Road area in Bartley over a span of just four hours.

The heaviest rainfall of 118.8mm was recorded at Kim Chuan Road in Bartley between 6.20am to 10.25am.

Rainfall in the area peaked between 8am and 8.30am, with an intensity of 56mm per hour.

The first flash flood occurred at 8.30am.

All of the floods, which lasted between 15 minutes and an hour each, had subsided by 10.30am.

Causes

Flash floods were due to "intense rain" and tidal influences.

Nine locations in eastern Singapore had flash floods due to "intense rain":

• Tampines Road (opposite Jalan Teliti)

• Tampines Avenue 12 (opposite Tampines Eco Green)

• Arumugam Road

• The junction of Sims Avenue and Eunos Road 8

• The junction of Sims Avenue and Tanjong Katong Road

• Jalan Nipah

• The junction of Bedok Road and New Upper Changi Road

• The junction of Upper Changi Road and Bedok North Avenue 4

Four other locations that lead to Bedok Canal were subjected to tidal influences:

• Jalan Nipah

• Bedok Road/ New Upper Changi Road

• Upper Changi Road/ Bedok North Avenue 4

• Bedok Road/ Upper Changi Road

Widespread rain was due to the prevailing northeast monsoon, aggravated by the development of a Sumatra squall over the Straits of Malacca which moved eastwards.

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Extent of flash flood at Upper Changi Road:

On a regular day: