There are thunderstorm warnings for the whole of Wales on Saturday and Sunday, but forecasting what areas will be affected is notoriously difficult. The Met Office has a yellow alert in place today between 2pm and 9pm, and tomorrow between noon and 9pm.
They say that high temperatures will "trigger" torrential and thundery rain showers across the country although some parts may not see any rain at all. Its weather maps, reproduced below, give their best estimate of where the thunder will be.
The area of high pressure which has been responsible for the last couple of weeks of settled weather for much of the UK has drifted away towards Scandinavia, allowing a plume of warmer, humid air from the south to influence the weekend weather for much of the UK.
