More than half a month’s worth of rain could fall in parts of the UK over the next 24 hours, along with thunder, lightning and possible flooding, forecasters have said.
Most of the country is blanketed with a Met Office yellow weather warnings for either rain or thunderstorms which will come into force from Sunday afternoon.
In the capital, the Met Office has warned heavy rain is set to hit London from around 5pm on Sunday.
Temperatures will remain around 20C throughout the day while the showers, although heavy, will be over a brief two-hour spell.
Afterwards, Londoners will experience grey overcast conditions which will continue until Monday afternoon, according to the Met Office.
It comes after showers hit areas of England overnight – with 21.5mm in Ringley, near Manchester, and 18.6mm falling in Charlwood, Surrey.
Jonathan Vautrey, a Met Office forecaster, told the PA news agency: “Some places could see 40mm to 60mm of rain, even 80mm in some places, which is more than half a month’s worth of rainfall depending on where you are.
“That could cause some sudden flooding spray on roads which could cause some difficult travelling conditions over the next 24 hours.”
In June, the entire UK averages 12 days of rain, totalling 77mm.
A yellow thunderstorm warning almost entirely covers England and Wales between noon and midnight, and there is also one until 9pm in Northern Ireland.
It warns of heavy showers, the potential for frequent lightning, strong winds and hail – which could cause flooding, travel issues and power cuts.
In northern England and Scotland, a yellow heavy rain warning is in place from 7pm on Sunday until noon on Monday.
⚠️ Two yellow weather warnings issued ⚠️
— Met Office (@metoffice) June 18, 2023
Rain across northern England and southern Scotland
Sunday 1900 – 2359
Latest info 👉 https://t.co/QwDLMfRBfs
Stay #WeatherAware⚠️ pic.twitter.com/imBwJlfyR9
Mr Vautrey said: “Overnight some places had showers and heavy bursts of rain, particularly in north-west England and the south-east.
“There were a couple of thunderstorms and rainy patches that grazed western Scotland, with heavy rain in Northern Ireland.
“If you were in those pockets, you would have seen heavy outbursts.”
He added: “With the heavy rain expected over the next 24 hours or so that could exacerbate some issues with flooding – but it has been very dry of late.”
The Environment Agency had 14 flood alerts in place across the Midlands and northern England on Sunday morning, meaning flooding is possible.
There are generally moderate or high UV levels across the UK, despite there being more cloud, while grass and nettle pollen is also very strong, the Met Office said.
Temperatures will reach the low twenties – making the air feel humid – despite the UK being in an area of low pressure.
