Tropical thunderstorms occur most often during the inter-monsoon periods between April-May and October}November. Winds due to squalls or squall lines frequently coming from the south and southwest during the summer months are also
included in the study. The highest gust speed recorded by the Singapore Meteorological Station was 40 m/s (recording since 1952). In the past several years, there were cases where many huge trees were up-rooted by strong gusts.