Areas of heavy rain and some thunderstorms will move northwards across areas of England and Wales early on Saturday, reaching parts of southern Scotland later in the morning. After this first batch of rain moves north, further heavy showers and thunderstorms are likely to break out in its wake. Rainfall will vary across the warning area and some places will avoid the heaviest rain. However, 10-20 mm of rain is likely to fall in some places in an hour or less, with potential for 30-50 mm to accumulate in a few hours. Event rainfall could reach 60-80 mm in some locations. Strong gusts and hail may also accompany some of the thunderstorms. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings.