Information on update: Start time pushed back to 13:00 BST, area refined, and most likely impact level reduced to low. Heavy, slow-moving showers and some thunderstorms are likely to break out during Wednesday afternoon. Along with lightning, gusty winds and some hail, these will have the potential to give 15-25mm of rain in 1-2 hours and perhaps 40 mm in a few places over 3-6 hours. This may lead to localised flash flooding, and impacts to the transport network. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings