Heavy thunderstorms are set batter part of the UK news week with some parts of the country likely to see a month’s worth of summer rain in 24 hours, forecasters have warned.
Hundreds of people have already been evacuated due to rising water levels in Lincolnshire.
The coming week will be unsettled, with sunshine and showers forecast for Monday as a low pressure weather system moves towards the UK.
“It will be driest and brightest in the south but there will be frequent showers with a risk of thunder in the northwest,” said Simon Partridge, a meteorologist at the Met Office.
The low pressure system will bring muggy conditions, higher temperatures and storms to much of the country.
Monday will see highs of 22C in southern regions and 17C in the north, just below average June temperatures. But conditions will change on Tuesday, as warm and humid weather moves up from the south.
Temperatures will rocket, hitting 26C in the south and 18C further north.
But conditions wil be cloudy and the warm spell will be accompanied by thundery showers which will develop later on Tuesday.
“There will be prolonged showers,” Mr Partridge said. “So it will be warmer next week but the storms are the price we pay for those [higher] temperatures.”
The yellow thunderstorm warning applies to the southeast and will be in place from 6pm on 18 June to 9pm on the following day.
Met Office forecasters said the storms could bring ”torrential rain, hail and lightning to a few places, with potential disruption to travel and flooding.”
“There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds,” a spokesperson said. In addition, there is a slight chance that the storms could cause power cuts.
“We’re expecting 15-30mm of rain to fall quite widely,” Mr Partridge said.
“But locally it could be up to 50mm...which is a month’s worth of rain in some parts. We are keeping an eye on places like Lincolnshire because of that.”
The River Steeping, which the town stands by, burst its banks on Thursday, causing emergency services to scramble to repair the breach. Water levels on the river remain high.
The Environment Agency has issued 13 flood warnings and 23 flood alerts, which remain in place across the Midlands and northeastern regions.
Next week’s thunderstorms will fade by Wednesday night and are expected to clear over the North Sea.
Temperatures on Thursday are expected to fall slightly, to the high teens and low 20s, as the hotter air moves away from the UK.