Britain will be battered by heavy rain and strong gale force Atlantic winds which will bring the first frost of the autumn.
Hefty, blustery showers will spread and soak many areas on Thursday, while temperatures are set to plunge from the mid-20s to 11C this week.
Some regions will drop into single figures and northern parts can expect the first frost of the season on Thursday, as the weather turns cold and the UK's long Indian summer becomes a distant memory.
Forecasters warned “severe gales” could cause havoc and pull trees down.
The Met Office said: “Thursday morning will see heavy blustery showers across Wales and southern England gradually spreading north.
”After a cold start further north, with a frost in a few places, there will be some sunshine during the morning and just a few coastal showers.”
The ferocious winds and heavy showers are set to continue into Thursday night with the risk of "possible thunder" in south Wales and the south and east of England.
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In the north west there will be "plenty of clear, chilly weather", according to the Met Office.
Tom Morgan, from the Met Office, told the Express most of Britain “is now seeing a marked change in weather”.
And he warned of “strong winds and gales” in south Wales and the south west of England.
He said: “The next few days will be dominated by low pressure, with gales in the south west and rain sweeping across most parts. of the UK.
"There could be severe gales with the potential for trees to come down."
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Jo Farrow, Netweather meteorologist, said: “By Thursday an Atlantic low will be throwing further bands of showers over the UK with strengthening winds and gales for Ireland and south west Britain.
“Then colder air from the north to end the working week.
“This brings the risk of frost, even wintriness in showers over the highest northern peaks.”
Forecasters say strong winds will continue to pummel the UK on Friday and it will leave Brits "feeling cold".
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