The thunderstorm could hit on Thursday. Pic: Andy Buchanan/AFP via Getty Images.
What is predicted: Following two days of hot weather, hitting 27 degrees on Wednesday, the Met Office has now issued a yellow warning.
It is predicting heavy storms and thunderstorms, which could bring flooding and disrupt travel.
How bad could it get: The warning says there is a small chance that homes and businesses could be flooded quickly, while the poor weather could also cause problems for public transport services.
When is the rain expected to start: While it is expected to stay quite warm tomorrow, there is a 70 per cent chance of rain from 11am onwards.
That could last for the rest of Thursday.