The Met Office has issued a yellow weather warning for thunderstorms, lightening, hail, power cuts and flash flooding for some areas in the UK.
Forecasters have said southern parts of England and Wales will be hit with heavy rain and as a result there could be flash flooding.
Within two to three hours it is expected some parts of the UK will see 20 to 30 mm of rain which could trigger flooding.
In some south-facing coastal areas thunderstorms, hail and strong winds could hit and the weather warning is in place from 16:00 on Monday until midnight.
A Met Office spokesperson said, “Areas of heavy showers and thunderstorms will move northwards across southern parts of England and Wales later Monday, clearing northwards overnight.
“Some places will see 20-30 mm of rain within 2-3 hours, with a small chance that a few places could receive 40 mm.
“Thunderstorms are most likely for south-facing coastal districts, and hail and some strong gusts of wind could accompany the heaviest showers and thunderstorms.”
They added, “Consider if your location is at risk of flash flooding. If so, consider preparing a flood plan and an emergency flood kit.
“Give yourself the best chance of avoiding delays by checking road conditions if driving, or bus and train timetables, amending your travel plans if necessary.
“People cope better with power cuts when they have prepared for them in advance. It’s easy to do; consider gathering torches and batteries, a mobile phone power pack and other essential items.
“If you find yourself outside and hear thunder, protect yourself by finding a safe enclosed shelter (such as a car). Do not shelter under or near trees, or other structures which may be struck by lightning. If you are on an elevated area move to lower ground.”
