Temperatures are set to plummet as “hefty showers” and thunderstorms hit Britain throughout the week. Met Office warned of a north and south “split”, with onshore winds striking parts of Scotland. Met Office meteorologist Marco Petagna said: “We will see north and south split weather-wise across the UK during the first half of this week. Plenty of fine weather towards the north with some sunshine at times. Elsewhere quite a few hefty showers, she of those could well turn thundery and then later in the week things turn generally colder towards the northeast.
“Temperatures well below average by the time we get to Friday. Looking at things in more detail for this morning across the north of the UK, we will see an east and west split across the western side of Scotland, some low cloud out towards the east.
“For Northern Ireland a pretty cloudy start to the day, here one or two showery bursts of rain.
“The cloud extends its way southeastwards into Wales, central and southern parts of England with further showery outbreaks of rain also likely to start Monday.
“The rest of the day it also stays quite cloudy across central and southern parts of the UK, then times Northern Ireland too, further outbreaks of rain developing here on and off throughout the day.
“Some of that could well turn thundery and quite heavy nature, especially across the Midlands and parts of northwest England as we head into the afternoon.”
The Met Office weather presenter added: “To the north and the east of this we will see plenty of sunshine, especially towards the west of Scotland, but some low cloud lingering there towards North Sea coasts.
“Especially across eastern parts of Scotland and at times northeast England as well.
“With the onshore wind here, temperatures no better than about 8C or 9C, but given some sunshine towards the south between those thundery showers temperatures respond quite nicely, easily into the mid-teens.”
BBC Weather’s Carol Kirkwood warned Britain should “watch out” for mist and fog on Monday morning with poor visibility in the southeastern corner of the UK.
She said: “We have got that weather front which is producing a line of cloud and some showers across some southern counties into south Wales.
“There will be showers in Northern Ireland, showers clearing western Scotland, and we will also see further showers develop which could be heavy and thundery with hail in parts of England and Wales – even as far north as Merseyside today.”
The BBC forecaster warned Britons must also watch out for low cloud across the northeast of Scotland and the northeast of England which is set to continue through the day and overnight.
Ms Kirkwood said: “There will still be some low cloud lapping on shore along the North Sea and, locally, in Scotland a touch of frost around.
“So, that’s how we start tomorrow. Still, with a weather front in the south still seeing some rain at times.”