BBC Weather forecast: Britons brace for thundery washout ahead of 25C heatwave

BBC Weather forecaster Tomasz Schafernaker warned heavy rain showers between Sunday and Monday could be thundery and lightning is also to be expected in northern and western parts of the country. But as we go through the week, hot weather will make a prompt return thanks to high pressure and warm air coming from the south. The BBC forecaster said: “If you’re unlucky today you might run into a downpour, thunder and lightning. We have clouds streaming in through the north-west. It’s a fairly thin broken cloud for most of us so the sunny spells are getting through.”

He added: “Tonight will stay dry in England and Wales but rain is expected in Scotland and Northern Ireland so in Belfast and Glasgow it looks like it’s going to be a soggy Monday morning.

“Temperatures overnight will be around that 10C mark.

“On Monday, we have high pressure to the south of the country so keeping things dry for the southern counties. In the north, we have weather fronts also quite close to low pressure, so more of a breeze here and quite windy around the western isles of Scotland and you can see all that cloud and rain moving across Scotland, Northern Ireland, the Lake District, the north-west and northern Wales.

“But the south-east and East Anglia will probably stay quite bright on Monday with temperatures getting up to 21C.”

On Tuesday, the picture will start to change as high pressure takes hold of our weather bringing warm air from the south.

Mr Schafernaker warned temperatures will get as high as 25C for some in the south and south-east, making for a welcomed return of summer conditions.

According to the Met Office, next week will see tropical maritime air “drawn across the UK”.

A spokesperson said: “It is likely to turn warm in the south-east of England where temperatures will rise into the low 20Cs, perhaps mid-20Cs in one or two spots.

“At present, this is not expected to fit the criteria for a heatwave, however, as this requires temperatures of 27C or higher in the south-east for at least three consecutive days.”

Warmer Atlantic air will track across the UK from the west with England and Wales forecast to see the mercury soar as high as 24C next week.

However, the Met Office said: “This warm weather will be associated with cloud and rain for some of us, as the jet stream remains over the UK.”

According to Met Office weather maps, sunny skies will be seen widely across the East of England, up into Scotland and across the North West on Wednesday.

Maps from both Netweather and WXCharts show warmer temperature anomalies around Tuesday, September 8 and Wednesday, September 9.

Maps have turned red with the heat anomalies, with up to 24C possible in the south of England.

The Met Office long-range forecast for Monday, September 7, through to Wednesday, September 16, predicts cloudy and dry conditions, but with the potential for heavy rain.

Despite this wet start to the period, more settled conditions are forecast from the West, with sunny spells.

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While there will be scattered showers and strong winds, temperatures will be near normal “perhaps just above normal for a time when the rain moves in midweek.”

If the UK has several days of consistently warm weather above-average temperatures, this would be known as an Indian Summer.

This is a term used to describe a period of unseasonably warm weather, typically in September, October and November.

The Met Office Meteorological Glossary first published in 1916, defines an Indian summer as “a warm, calm spell of weather occurring in autumn, especially in October and November.”

Despite a baltic bank holiday last week and meteorological autumn beginning on September 1, the hot weather may not yet be over.

With sun and warmer weather forecast to shine down on the UK over the next couple of weeks, bookmakers have cut odds on heatwave conditions, an Indian Summer and even September being the hottest month of the year.

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