Every 2 minutes Window reads NEA's lightning detectors, rain radar and rain gauges around Southern Islands. 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 Southern Islands comes from NEA's South region monitors (24-hour PSI and 1-hour PM2.5). The nearest rain gauges are Artillery Avenue (Sentosa) (5 km) and Malan Road (8.5 km).
Alerts for Southern Islands on Telegram: @WindowSingaporeBot. A heads-up before storms and when haze turns unhealthy; nothing for maybes.