The warning in place from noon today until 9pm warns of heavy showers or or longer spells of rain with some thunderstorms likely.
The Met Office said it is like to cause some travel disruption and flooding. .
According to an alert: “Flooding of a few homes and businesses is likely.
“Bus and train services probably affected with journey times taking longer
“Spray and flooding on roads probably making journey times longer.
“Some interruption to power supplies and other services likely.