The Met Office has issued a yellow thunderstorm warning for Oxfordshire as much of the UK is set to be lashed by heavy rain.
The warning, which also covers London, the south east, north east, north west, south west and the Midlands, is in place from 4am to 9pm on Sunday (September 1).
Forecasters say there is a "small chance" of flooding and disruption in Oxfordshire.
There is a chance of delays and some cancellations to public transport and a slight chance that power cuts could occur.
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It will also be a warm day with temperatures forecast to reach 24C.
The thunderstorms will start in the south first before moving northwards through the afternoon and evening, said the Met Office.
"The extent of these thunderstorms is very uncertain, and many places will miss them, but where they do occur, 30 to 40mm of rain may fall in less than an hour with perhaps over 75mm in one or two places, leading to a chance of flooding and disruption.
"Frequent lightning strikes and hail will be additional hazards, most likely across southern and central England."
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