UK weather forecast: Heatwave to last until Autumn as map shows jet stream changing course

As the nation gets ready for the mercury to rocket back into the mid-30Cs forecasters are predicting hot weather into the start of autumn. A sweltering Continental plume will sweep in through the coming days pushing the mercury to around 17C higher than normal for the time of year. Unseasonable heat will hold out beyond the bank holiday and possibly into the second half of September, according to Government meteorologists.

Independent long-range forecasters agree the hot weather is likely to hang about although there will be a risk of thundery breakdowns over the next few weeks.

Exacta Weather forecaster James Madden said: “The hot spell is about to hit and over the coming days temperatures will soar well above average for the time of year.

“Parts of the country will see maximum temperatures in the low to mid-30Cs at times through the bank holiday and during the early part of next week.

“It will remain warm and summery into the latter part of next week although slightly lower temperatures compared to the bank holiday will take the sting out of the heat.

“Hot weather could hold out well into September although there are signs of a change to something more unsettled around mid-month.”

Blistering heat will be driven by a swing in the jet stream which, usually further south at this time of year, has leapt northwards over the UK.

When in this position it allows a flow of warm air from the south while stopping unsettled Atlantic weather systems from reaching Britain.

It has moved from its more southerly position which, at the start of the month, was largely responsible for the wet, stormy weather.

Weather models have the jet hovering to the north of the UK through the weekend and into the middle of next week.

A strong region of high pressure stretching almost 2,000 miles from the Atlantic Azores Islands to the UK will help keep the thermostat turned up.

Met Office meteorologist Dean Hall said: “High pressure will build to the south of the UK over the coming days bringing settled and hot conditions for the long weekend.

“By Monday we expect to see highs of 33C (91.4F) across the south of the country, and this will make it the hottest August Bank Holiday on record.

“Beyond Monday there will be a good deal of warm and dry weather around, and there will be plenty of sunshine through next week with temperatures remaining above average.

“How long this hot weather lasts though will be down to the jet stream which is currently north of the UK, if it moves we could see a thundery breakdown.

“The models are mixed, however it is likely we will see further warm, settled weather beyond the bank holiday and through next week.”

The Met Office’s long-range outlook suggests warm weather will hold out until the middle of September.

It states: “Southern areas are most likely to see the driest and sunniest weather in the early days of September, perhaps with some lingering wet and windy conditions affecting the north.

“Longer spells of dry and sunny weather may occasionally develop across all parts.

“Temperatures are generally likely to be warmer than average.”

Bookies will be cashing in on the bank holiday sizzler as odds on this year once again entering the record books tumble.

Ladbrokes is offering 4-7 from 2-1 on this weekend smashing records while Coral is going 1-2 on 30C (86F) or higher on Monday.

Ladbrokes spokesman Alex Apati said: “It’s been a month of coats and brollies so far but we’re strapping ourselves in for a record-breaking end to August.”

Coral’s Harry Aitkenhead added: “We’ve suffered some fairly horrible weather throughout August but at last we are seeing the sun shine.

“Everything is set for a belting Bank Holiday and we make it odds on that 30 degrees is reached.”

While much of the country will enjoy mid-summer like heat through the end of August, northern regions may catch the soggy end of low pressure passing the UK.

There will also be a risk of wind across Scotland and northern Britain through the coming days, according to the Weather Company.

A spokesman said: “Saturday and Sunday should see rain in northwestern areas, while the sunny spells across the south and east should become more widespread.

“Bank Holiday Monday may see more rain across the north-west on strengthening winds, while most of England and Wales should remain dry with more sunshine.

“The South-East and East Anglia will be hot.”

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