Met Office meteorologist Aidan McGivern declared that the increased humidity on Saturday will be responsible for “hit and miss thunderstorms”.
He explained: “The humidity will build through Saturday and then for south-west England, Wales and then across the Midlands and especially northern England there is the risk of intense thunderstorms developing through Saturday night.
“Later in the night these will push into East Anglia and the south-east of England before clearing.
“They do move through fairly quickly but if we are caught in one of these intense thunderstorms, hit and miss thunderstorms.”
The meteorologist added that up to 30millimetres of rain could fall in spots hit by electrical storms.
He went on: “Well we could see 30millimetres of rain in a short space of time as well as hale and gusty winds.”
Mr McGivern explained that Saturday will start off misty in some areas but will soon “burn back”.
The forecaster added that temperatures are set to reach as hot as 25C in some southern areas.
He commented: “A warm start to the day and plenty of sunshine up and down the country.
“There will still be some mistiness around say Dumfries and Galloway into north-west England and some western coasts of England and Wales as well.
“But this will quickly burn back towards the coast with bearing in mind that through Saturday there will be sunshine inland but there will be some mistiness around coasts and cooler temperatures as well.
“But inland where we have got that sunshine, well temperatures once again will rise into the low to mid 20s and it will perhaps be a degree or so cooler compared to Friday.”
The meteorologist declared that “a change of weather” will approach on Sunday that is set to bring an end to sizzling temperatures.
He explained that a “cold front” is set to sweep across the nation.
Mr McGivern went on: “The thunderstorms do move through smartly and then we are into a change of weather by Sunday.
“A cold front will bring cloud and outbreaks of rain into the north-west as we begin Sunday.
“It will also mark a transition to cooler and much more changeable weather from the Atlantic.”
The weather will be marked by a mixture of sunshine and showers over the next week, the Met Office forecast.
Mr McGivern remarked: “So we begin Sunday with high levels of humidity in the south-west, not good news for marathon runners.
“Thunderstorms will clear away and then there will be sunny spells for a time before thicker cloud pushes in from the north-west and for much of the country ends Sunday with a mixture of sunshine, showers and a keen westerly breeze and much fresher temperatures.
“That is the kind of weather that takes us into the new week next week.
“So if you are enjoying the spring sunshine, make the most of it on Saturday because a change is on the way.”
Read more from source here…