Saturday was the warmest day of the year so far, but there was also more than 3,000 lightning strikes - and forecasters are warning of even more today. The Met Office says that high temperatures on Sunday will trigger showers and thunderstorms across parts of Wales with up to 40mm of rain in an hour.
The thunderstorms are expected to develop through the afternoon, with parts of south Wales likely to see some through the night.
BBC weather forecaster Simon King said: "Lovely start to Sunday morning with just some mist around coastal areas but it was quite a sticky night. It is going to be another hot day and there will be a greater chance of picking up a thunderstorm today.
