Slow-moving heavy showers and thunderstorms could cause travel disruption in a few places on Monday between 10am and 8pm this evening.

An area of heavy rain will turn more showery later this morning, with a risk of thunderstorms developing, which may be slow-moving in some places. Heavy showers and thunderstorms clearing away southwards early evening. 15-20 mm of rain could fall within an hour and 30-40 mm within 3-4 hours in a few places. Lightning and hail are also possible.

What to expect

Some flooding of a few homes and businesses likely, leading to some damage to buildings or structures
There is a good chance driving conditions will be affected by spray, standing water and/or hail, leading to longer journey times by car and bus
Delays to train services are possible
Some short term loss of power and other services is possible
Possibly some damage to a few buildings and structures from lightning strikes

Local authorities affected in Wales

Bridgend
Caerphilly
Cardiff
Merthyr Tydfil
Neath Port Talbot
Newport
Rhondda Cynon Taf
Swansea
Vale of Glamorgan