Holidaymakers preparing for a weekend getaway face the risk of travel disruption after the Met Office issued a weather warning for heavy downpours and thunderstorms for parts of Britain, including East Anglia.
Weather experts have warned that some regions may be hit by localised flooding from Saturday evening into Sunday as thousands plan to set off for their summer break.
Rachel Vince, a forecaster for MeteoGroup, the weather division of the Press Association, said the South East of England and East Anglia would be worst hit by torrential downpours, with popular holiday destinations in the South West also at risk.
"On Saturday, pretty much the whole country will have a fine start with spells of sunshine," she said.
"But, after a pleasant morning, thunderstorms moving in from the Continent will affect south-east England and the Midlands by mid-afternoon. We could see a repeat of the thunder and lightning seen recently.
"By Sunday, the south-east corner of England is at risk of torrential downpours and localised flooding. The South West is also in that risk of thunderstorms."
Temperatures will remain warm for most of the country, however, with highs of 24C (75.2F) to 26C (78.8F) in central and eastern England and 21C (69.8F) to 23C (73.4F) in western and northern parts of Britain, Ms Vince said.
The Met Office issued a "yellow" warning of rain following concerns that heavy showers and thunderstorms expected over France on Saturday could move north to affect south-east England and East Anglia.
It said: "The public should be aware of the risk of localised disruption to travel due to surface water flooding.
"The start time of this warning has been brought forward to cater for the risk of localised disruption associated with the heavy overnight rain moving north across parts of Northern Ireland, north-west England and south-west Scotland."
The Environment Agency (EA) had seven flood alerts in place on Thursday afternoon in areas where flooding is possible, including the South West, Wales, the Midlands and East Anglia.