Heavy showers will develop this evening, becoming more frequent and widespread overnight. These are likely to bring 15 to 20 mm in an hour in some areas with as much as 30 to 50 mm falling in a period of six hours in some places. These accumulations may lead to a few places seeing some flooding. Alongside the rain, some showers are likely to be thundery, bringing the additional hazards of lightning and hail. The showers will ease from the northwest Thursday morning. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings