Every 2 minutes Window reads NEA's lightning detectors, rain radar and rain gauges around Central Water Catchment. It tells you when a thunderstorm is closing in and roughly when it will arrive, when to stay indoors because lightning is within 10 km, and when rain is likely in the next two hours.
Haze for Central Water Catchment comes from NEA's Central region monitors (24-hour PSI and 1-hour PM2.5). The nearest rain gauges are Upper Peirce Reservoir Park (1.1 km) and Seletar Reservoir (2.4 km).
Alerts for Central Water Catchment on Telegram: @WindowSingaporeBot. A heads-up before storms and when haze turns unhealthy; nothing for maybes.