A monsoon surge, which caused extensive rainclouds to form over surrounding region of Singapore, is expected to affect the South China Sea and our surrounding region over the next few days, including during Lunar New Year this weekend.
National Environment Agency reported that the surge is forecasted to bring occasionally windy conditions with passing showers in the afternoon on Friday (27 January).
While, cloudy and occasionally windy conditions with periods of showers, heavy at times, are expected on Saturday (28 January), the first day of the Lunar New Year.
However, the surge is forecasted to gradually weaken on Sunday (29 January), the second day of the Lunar New Year, and it is expected to be occasionally windy, with passing showers in the afternoon.
NEA also noted that the daily temperature during the weekend is forecast to range between 22°C and 32°C.
According to the agency, the Northeast Monsoon develops during the northern hemisphere winter between December and March, when cold and dry conditions develop over much of continental northern Asia. Consequently, high pressure systems in these regions produce cold subsiding air that flows southward towards the low pressure systems in the southern hemisphere.
As the winds move over the South China Sea, they warm and gather moisture, leading to the formation of dense rain clouds in the equatorial region.
On occasions when the winds are particularly strong, they can bring showers and thunderstorms to coastal regions in Southeast Asia such as Vietnam, Peninsular Malaysia, and Singapore. This phenomenon is known as a Northeast Monsoon Surge and most frequently occurs between November and January.
On average, Singapore experiences 2 to 4 monsoon surges each year. Each event can last between 1 and 5 days where widespread continuous moderate to heavy rain affects the island. Sometimes the surges come in spells with breaks of cloudy or overcast conditions.
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