The Met Office issued this weather warning at 10:34 am on Friday 17 September.
The warning period is 12 noon on Sunday until midnight.
The warning reads:
‘A band of rain and heavy, thundery showers will slowly drift east through Sunday before becoming slow moving over the highlighted area later in the day.
‘Where these showers become slow moving, 30 to 40 mm of rain could fall in a relatively short time leading to surface water flooding and transport disruption.’