Brits have been urged to brace for heavy flooding as a six-hour storm is expected to cause a month's worth of rain.
It comes as the Met Office issued a yellow weather warning for thunderstorms across nearly the whole of England and Wales.
The warning has been placed between noon and midnight today (June 18), while Northern Ireland's is in place until 9pm.
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The yellow alert includes torrential showers which could be as heavy as 80mm dropping within three to six hours in the worst affected places.
This extends to recurrent lighting, strong winds and hail which could also spark travel disruption and power cuts.
Despite the soggy weather, the humidity is set to continue, with temperatures expected to reach the mid-20s.
"Some of the storms have the potential to be quite intense, with high rainfall rates," warned Grahame Madge from the Met Office.
"Some locations may well miss them all together but all we can do now is indicate that there is a risk across both countries."
He continued: "We will keep the yellow warning closely monitored and if we need to escalate that for local areas then we will."
Met Office Meteorologist Chris Almond said: “Over the weekend we’ll be transitioning to a more unsettled regime for the UK, though temperatures will remain high and it’ll feel very humid for many.
“Heavy showers and thunderstorms are likely to become more frequent and impactful through the weekend, with the potential for associated hail, lightning and some gusty winds."
The Deputy Chief added: "The risk of thundery downpours initially starts in the far west on Friday afternoon, but spreads more widely through the weekend, resulting in the warning the Met Office has issued.
“There’s an ongoing likelihood of further warnings being issued and revised in the coming days, so keep an eye on the forecast for the latest outlook.”
Sarah Cook of the Environment Agency commented: "On Sunday afternoon and into the night, slow-moving heavy showers and thunderstorms could lead to localised surface water flooding across England.
"Environment Agency teams are out on the ground and will support local authorities in responding to surface water flooding.
"We urge people not to drive though flood water – it is often deeper than it looks and just 30 centimetres of flowing water is enough to float your car.
"People should check their flood risk, sign up for free flood warnings and keep up to date with the latest flood updates."
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