After heavy rain on Tuesday, conditions will improve briefly into Wednesday. However, another spell of persistent and sometimes heavy rain is expected to move in from the south on Wednesday morning. It’s uncertain exactly where the heaviest rain will fall, so confidence is low about the highest totals in specific places within the warning area. Despite this, there is a good chance of 20-30 mm of rain falling quite widely, over a 12-15 hour period, and some exposed locations, most likely on south facing hills, could see 40-50 mm or rain. With widely wet antecedent conditions there is an increased risk of flooding in some areas. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings