Flood warnings have been issued as Storm Aiden threatened to lash the UK with torrential rain.
With temperatures plunging as low as 1C this week, a heavy band of rain is sweeping in from the North West.
The Met office said: “A cold start to Monday morning that band of rain will gradually moving its way across Northern Ireland and into Scotland later pushing into Wales and Southwest England.”
The River Wissey at Mundford, Stoke Ferry and Hilgay in Norfolk is expected to flood with “immediate action required”.
Flood alerts have also been put in place for other rivers in East Anglia including the tidal rivers Waveney and River Yare.
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A new weather front moving in will bring a change in the wind direction and “that means much milder conditions will be spreading across the UK,” said BBC Weather’s Tomasz Schafernaker.
He added: “We will have lost that cold northerly wind and instead get this Atlantic westerly, so there’s milder air, but with that comes a price – cloud and rain.
“But temperatures are back up to 18C on Monday in London, 17C in Hull, 15C in Newcastle.”
After a further lull on Tuesday, the next low pressure front will be racing from the west, pushed by a powerful jet stream.
Mr Schafernaker said: “So by about Wednesday onwards the weather is really going to go downhill.
“Across many parts of the UK we are expecting outbreaks of rain and stronger winds.
“And from Wednesday onwards pretty much all areas are in for an unsettled spell of weather which will take us into the following weekend as well.”
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