The BBC weather forecaster even warned that Eastern England and Scotland could see hail and that the South coast could be battered by winds of up to 40mph – just days after an end to the extended British heatwave.
Reporting from a very wet Bristol Balloon Fiesta – and filling in for BBC weather regular Carol Kirkwood – Ms Keith-Lucas told viewers to expect “scattered showers today – some of those showers will be blustery with fairly breezy conditions throughout the day.”
She warned that several air pressure systems will bring miserable weather to the UK throughout the weekend.
“We’ve got low pressure sitting out towards the East, that brought all the rain to the South East of England yesterday, also low pressure approaching from the West too.”
“There are a couple of weather fronts in the West today, set to bring some showery rain.
“The heaviest of the showers will be for the West of Scotland into Northwest England, Northern Ireland, Wales, and the Southwest of England too.
“Showers will be heavy, and thundery too – with a bit of hail mixed in.”
The forecaster reported that Saturday will start on a more settled note “with temperatures of around 17 – 22C across the country.”
But Sunday will see the UK hit by a deluge of rain, with the forecaster warning: “there will be heavy rain for central parts of England and Wales.
“Still a few showers for Scotland and for Norther Ireland, but I think the driest weather will be for the South East of England – where it will be quite breezy but a little bit warmer, and a little but more humid.”
The Met Office warned that cyclonic weather systems will sweep in from the Atlantic over the next week giving the weather a shake up.
Met Office spokesman Richard Miles said: “It is going to cool down across the country over the next few days while turning much more changeable.
“Thursday will bring a risk of thunderstorms in the north and west and on Friday, although there will be sunny spells, there will be further showers with some thunder and hail.
“These showers will be quite heavy, widespread and frequent moving in from the west before spreading eastwards across the country.
“On Saturday, although it will be mainly dry and sunny in the southeast, there will be rain spreading across the country with a risk of gales along the western coasts; this is being driven by low-pressure coming in from the Atlantic.
“From Sunday it is turning wetter, cooler and windier generally and this is the picture for the following week with further areas of low pressure coming into the country, we do not see an immediate return of the very hot weather.”
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