Heavy rain will move in through Wednesday afternoon and evening, becoming persistent in places during the evening. 20 to 30 mm may fall within 3-4 hours in a few locations.
Rain may also turn to snow over the higher routes in south Wales towards midnight, perhaps with a few cm accumulating.
What to expect
- Spray and flooding on roads probably making journey times longer
- Bus and train services may be affected with journey times taking longer
- Flooding of a few homes and businesses is possible
Regions and local authorities affected
- Blaenau Gwent
- Merthyr Tydfil
- Neath Port Talbot
- Rhondda Cynon Taf
- Vale of Glamorgan