Every 2 minutes Window reads NEA's lightning detectors, rain radar and rain gauges around Paya Lebar. 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 Paya Lebar comes from NEA's East region monitors (24-hour PSI and 1-hour PM2.5). The nearest rain gauges are Paya Lebar Meteorological Station (1.1 km) and Bedok Reservoir (1.8 km).
Alerts for Paya Lebar on Telegram: @WindowSingaporeBot. A heads-up before storms and when haze turns unhealthy; nothing for maybes.