Explainer: What's behind the erratic weather and heatwave, and what to do to brace for ‘extreme’ changes ahead

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Explainer: What's behind the erratic weather and heatwave, and what to do to brace for ‘extreme’ changes ahead
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SINGAPORE — The heavy rains on Tuesday (May 16) morning provided some reprieve from the recent heatwave but experts said that it is not likely the end of the hot weather spell.

TODAY takes a closer look at the causes of erratic weather changes, what is to be expected and what Singaporeans can do.A heatwave is caused by a system of high atmospheric pressure that moves into an area, Professor Benjamin Horton said.

Dr Wang Jingyu, an assistant professor of physical geography at the National Institute of Education , said that “it was the hottest April in Asia”. Dr Wang breaks it down as such: “The sea surface temperature becomes cooler than normal over equatorial Asia, which slows down the evaporation, causing less cloud formation, thus less rain.”

Monsoons control the season’s temperature and rainfall variability here, causing May to be the hottest month and December to January to be the coldest with average temperatures of 29°C in May and 24°C in December and January. Heavy rain that occurs in the middle of heatwaves is normal over the maritime continent and does not mean the end of the heatwave, Dr Wang from NIE said.

It is advisable to wear loose clothing that is breathable, Dr Chua suggested, because it allows accumulated perspiration to evaporate and thereby reducing body heat.

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