Rain, heavy and persistent at times, is expected to develop through Thursday evening, before affecting much of England and Wales through Friday.
Rain gradually clears from the north through Friday afternoon and evening. Widely 10-20 mm of rain is likely but in the wettest spots 30-50 mm is possible, and some high ground of Wales especially could see 60 to 70 mm. Across the south of the area its possible some thunderstorms may break out, and these could bring 20-30 mm of rainfall in a couple of hours.
What to expect
- Spray and flooding on roads probably making journey times longer
- Flooding of a few homes and businesses is likely
- Bus and train services probably affected with journey times taking longer
The weather warning has been put in place between 9pm on Thursday and Friday 11:59pm.
Local authorities affected in Wales
- Blaenau Gwent
- Isle of Anglesey
- Merthyr Tydfil
- Neath Port Talbot
- Rhondda Cynon Taf
- Vale of Glamorgan