Central Singapore
Sengkang weather
Northeast heartland next to Punggol. Typical inland thunderstorm climatology.
How rain usually arrives here
Sengkang matches Punggol and Hougang more than it matches Jurong. Inter-monsoon afternoons are the thunderstorm season. A west-origin squall is often weaker by the time it gets this far east.
After lunch in April, May, October and November, use the 2-hour nowcast and the 50 km radar together. The island 24-hour line is too coarse.
Central Singapore
Central towns sit on the inland heating plateau and against the catchment. Inter-monsoon afternoons are thunderstorm country. A stalled red cell over Toa Payoh or Bishan is the usual flash-flood setup.