The Met Office has issued a servere weather warning for storms - but it will still be warm
The Met Office is warning people to take care during potential thunderstorms and flash flooding.
The storms are expected to hit between 5pm tomorrow and 6pm on Wednesday.
However, temperatures will still be warm with highs of 30c predicted.
A spokesman said: "Thunderstorms breaking out over parts of Northern Ireland later on Tuesday are expected to extend northeast to affect parts of Scotland overnight and into Wednesday morning.
"There is also potential for some severe thunderstorms to develop across Wales, northern England and the Midlands. Here, the risk is greatest during Wednesday, by which time the risk of storms will be reducing across the west of the yellow area - and then finally also reducing across the east of the area by Wednesday evening. Whilst most places will miss the worst, please be aware of the risk of flash flooding.
"Frequent lightning, large hail and strong winds could be additional hazards. All of this could lead to some flooding of homes, businesses and transport networks. Disruption to power is also possible.