More than half a month's rain might fall throughout the south of England in the present day, which might result in "homes and businesses" being flooded, the Met Office has warned.
Between 30mm to 40mm of rain is predicted to fall in some spots in simply six hours.
In a typical August, 63mm of rain falls throughout the southeast of England over all the month.
Buildings and buildings might be broken by flooding and lightning strikes whereas houses might lose energy "for a short time".
There can also be "a good chance" drivers might be delayed by spray and standing water, and of rail passengers going through delayed journeys.
Holidaymakers starting their getaway are suggested to examine the forecast and social media channels for updates and brace themselves for prolonged journey occasions.
A yellow climate warning for thunderstorms has been issued by the Met Office for big elements of the South and the West Midlands between 6am and noon on Friday.
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The space affected covers London in addition to the entire of the South East and the Solent space, stretching north all the best way to Birmingham.
A yellow warning for wind is in place throughout coastal areas of north and mid-Wales between midnight and 6pm on Friday - and gusts might attain as much as 60mph.
The Met Office stated bushes might fall down main to coach cancellations and sure delays.
Marquees and tents that could be utilized by campers in Snowdonia might additionally fall down within the gusts whereas caravans and lorries might wrestle on some roads.
Homes might additionally lose energy for a short while in affected areas, the forecaster warned.
Met Office meteorologist Rachel Ayers stated showers will start to fall within the southwest of England and South Wales earlier than rising in depth as they transfer eastwards.
Heavy showers might hit areas unaffected by the climate warnings however they don't seem to be more likely to put folks in any hazard.
Ms Ayers stated: "Given it is summer holidays, people are more likely to be wanting to be outside and travelling for holidays.
"There is an opportunity we might see driving circumstances affected, resulting in longer journey occasions.
"Take the advice from our partners such as the RAC with regards to driving in heavy rain if you do make that journey."
She stated circumstances ought to brighten up throughout a lot of the UK on Saturday - with sunshine and showers doubtless amid "blustery" circumstances.
Heavy rain on Saturday is more likely to be confined to the northeast of Scotland, she added.
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