Every 2 minutes Window reads NEA's lightning detectors, rain radar and rain gauges around Bukit Merah. 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 Bukit Merah comes from NEA's South region monitors (24-hour PSI and 1-hour PM2.5). The nearest rain gauges are Henderson Road (1.5 km) and Malan Road (1.7 km).
Alerts for Bukit Merah on Telegram: @WindowSingaporeBot. A heads-up before storms and when haze turns unhealthy; nothing for maybes.