The Met Office has issued a severe weather warning for South Yorkshire for the end of this week.
On Friday torrential rain will move northwards across the country, and some areas could see as much as 3 inches of rain fall in the deluge.
Forecasters have warned of 'a significant risk of very localised disruption to travel due to surface water flooding'.
Hail and lightning could be extra hazards in some areas.
The Met Office's chief forecaster said: "An area of low pressure is expected to push north then east across England during Friday.
"With very warm air entrained into the system, locally heavy rainfall is likely to continue as the system pushes across England and Wales.
"25 to 40 mm of rain is possible in 6 to 12 hours, with as much as 70 mm possible very locally by the end of Friday.
"Localised thunderstorms may develop across the south and east of England during Friday afternoon, these potentially giving 15-25 mm of rain in a few hours.
"The development and subsequent track of this system is very complex, and uncertainty in the details of this event is relatively high. As such this warning will be updated in the coming days as confidence increases."