After basking in the year's hottest temperatures at the end of the week, Britain is now braced for torrential downpours and storms that could cause flash flooding across large parts of the country.
The Environment Agency has warned almost every county in England and Wales is at "medium" risk of flooding, and has issued dozens of flood alerts, the majority of which are in the Midlands, South West and South East.
An amber weather warning is in place across much of England and Wales for heavy rain and thundery downpours.
There may be some drier and brighter weather around this afternoon - more so for the north-east of England - but elsewhere it stays very changeable.
Temperatures are still on the hot side down in the south-east, elsewhere it will still be in the low twenties.
Viewers have posted dramatic pictures of the storms which ravaged the UK last night. The photos were posted on the ITV News Facebook page.
It seems thousands of people were woken up by loud claps of thunder, seemingly constant flashes of lightning and torrential rain.
Britain is set to bask in the sunshine in the next few days with health officials issuing guidance on how to stay safe in the sunshine.