Thundery rain will reach the south of the warning area later Friday before spreading north to affect much of England through Saturday. Rain will likely be locally torrential, bringing 20-30 mm in less than an hour in many places, with 60-90 mm in less than three hours possible in a few places. Whilst rain will clear from the south of the area by early Saturday afternoon, further thunderstorms are likely to develop here. As well as heavy rain, impacts from frequent lightning, gusty winds and large hail are also likely. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings.