UK weather: Rain and flooding ahead as Met Office issues amber weather warning after autumnal equinox
Sunday marks the autumnal equinox - a biannual event in which the sun is exactly above the equator. Sundayâs weather warning will remain in place until 11.59pm, with the Met Office forecasting up to 80mm of rain over the course of 12 to 24 hours - nearly matching the September average for rain in the UK.