Another spell of thundery rain is expected to push north across England and east Wales through Friday morning, persisting for much of the day, before clearing early on Saturday. There is some uncertainty in storm coverage, particularly western extent, but where they do develop torrential rain, intense thunderstorms, hail and frequent lightning are all possible.
Rainfall totals of 20-40 mm, perhaps 60 mm in a few areas, are possible in 12 hours. With the most intense storms, 30-40 mm could fall in an hour or two. The storms should clear into the North Sea during Saturday morning. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings