Radar, lightning and rain gauges: NEA via data.gov.sg (Singapore Open Data Licence). Forecast steps carry the latest radar along its measured motion. Coastline: URA Master Plan 2019 and Natural Earth.
1 lightning strike within 30 km of the city centre in the last 30 minutes (2:08 pm), the nearest 26 km north-west. Window says: Keep the windows shut. PSI 153 in the South and rising.
Singapore has one of the highest rates of lightning in the world, most of it in afternoon and evening thunderstorms. Window reads NEA's lightning detectors every 2 minutes and shows strikes from the last 10 minutes on the radar, with a count for the last 30 minutes.
Window can tell you on Telegram to stay indoors when lightning is within 5, 10 or 15 km of your home, and give the all clear 30 minutes after the last strike: @WindowSingaporeBot.