The UK is having a late summer burst of hot weather – while parts of the Mediterranean have been experiencing a phenomenon known as a “heat dome”, forecasters say.
Temperatures in Britain could soar as high as 32C (90F) this week, as much as 4C (39F) higher than Ibiza.
Here, Sky News looks at what is causing the unusually warm conditions in the UK and elsewhere in Europe – and whether we are set for an official heatwave.
Image: People enjoy the hot weather in London’s St James’s Park
What is a heat dome?
A heat dome is loosely defined as an area of high pressure that stays over the same area for days, or even weeks.
Hot air is trapped underneath like a lid on a saucepan, pushing temperatures above what’s normal for the time of year.
The heated air expands upwards into the atmosphere, then high pressure from above acts as a lid, meaning it can’t escape and causes the air to subside or sink – creating a dome effect, the Royal Meteorological Society said.
As the warm air sinks, it compresses and heats up, which then traps more heat underneath and clouds are pushed around it, keeping the heat in even more.
The Met Office says heat domes encourage temperatures “to keep building day on day”.
However, Sky weather meteorologist Dr Chris England said the phenomenon “doesn’t really apply to the current heat of the UK”.
He said that while a heat dome “has been relevant to some of the Mediterranean heat”, the high pressure affecting the UK “is well to the east”.
“Instead, the flow around the high pressure is generally from the south over the UK, bringing heat up from the Mediterranean and north Africa,” Dr England added.
The Met Office says tropical storms in the far western Atlantic, and deep areas of low pressure, have helped to amplify the jet stream over the Atlantic Ocean and has led to high pressure “dominating over the UK”.
Is the UK set for an official heatwave?
The word “heatwave“is often used to describe any period of sunny weather, but the Met Office defines it as “an extended period of hot weather relative to the expected conditions of the area at that time of year”.
It says the UK experiences a heatwave when it has at least three consecutive days with daily maximum temperatures meeting or exceeding the heatwave temperature threshold – and this threshold varies by UK county.
Sky weather forecaster Kirsty McCabe said official heatwave conditions “will be met this week as temperatures soar over the next few days with a late blast of summer heat, especially for southern parts of the UK.”
The peak is likely to occur on Wednesday and Thursday with 31C (88F) or even 32C (90F) possible.
The threshold temperature ranges from 25C (77F) in Scotland and Northern Ireland, to 28C (82F) in London and the Home Counties.
But Ms McCabe said “it’s not just hot weather heading our way, a Saharan dust plume will cross the UK, bringing some spectacular sunrises and sunsets”.
Hitting 30C in September “used to happen around once every seven years or less, but has occurred more frequently in the last decade,” she said.
Could we have the hottest day of the year this week?
This year’s highest temperature is 32.2C (90F) at Chertsey on 10 June and Coningsby on 25 June.
Ms McCabe said: “There is a chance we could exceed that this week [Wednesday or Thursday].”
The highest September temperature ever recorded in the UK was 35.6C (96F) in South Yorkshire in 1906.
Is this an Indian summer?
According to the Met Office Meteorological Glossary, an Indian summer is a warm, calm spell of weather that occurs in autumn, “especially in October and November.”
There is, the Met Office says, no statistical evidence to suggest that such warm spells recur at any particular time each year – warm spells during the autumn months are not uncommon.
How long will the UK’s hot weather last?
An amber alert is in place for the whole of England except the North East, where a yellow alert is in place.
The alert, issued by the UK Health Security Agency and the Met Office, is in place until 9pm on 10 September.
Temperatures reached 30C on Monday in southern England and the southeast of Wales, according to the Met Office – and the hot weather will continue through Tuesday, with highs of 31C (88F) expected.
Met Office spokesperson Oli Claydon said: “We will see good sunny conditions through the week with cloudless skies, and some high temperatures by the time we get to Wednesday and Thursday, where we could see 31 maybe 32 degrees.”
The Met Office said temperatures could also hit 31C (88F) on Friday, although there could be more cloudy weather and chances of rain in the far northwest of Scotland.
But the weather conditions could change over the weekend and Mr Claydon said there is “no indication at the moment of another strong heatwave after this”.
He added: “Through the weekend, we start to see some heavy, potentially thundery, showers developing but (they are) only isolated. There is a little bit of uncertainty as we start to get that far ahead.”
Average temperatures are expected to return by the middle of next week.
Today, Sir Keir Starmer will deliver on his pledge to recognise a Palestinian state – after setting out a series of conditions in July which there was little prospect Israel could meet, including agreeing a ceasefire with Hamas.
The prime minister will say it recognises the “inalienable right” of the Palestinian people and what he feels is a moral responsibility to keep a two-state solution alive, amid the devastation of the war and concern about settlement expansion in the West Bank.
This will be formally put forward by the British government at a conference of the UN General Assembly in New York this week, after a diplomatic push led by Emmanuel Macron. Canada and Australia are also expected to recognise it, although may call for Hamas to disarm.
But Labour has always said it’s a move they would make as part of a peace process, which looks further away than ever.
What does it mean?
The move has been heavily criticised and leaves a number of questions not only about what it will achieve – but about whether it will have the opposite effect on the conflict.
David Lammy as foreign secretary conceded when the pledge was announced that “it will not change the position on the ground” which can only come through negotiations.
After all, 147 of the 193 member states of the United Nations recognise it already. Palestine has permanent observer status at the UN – speaking rights, but not voting rights – where it’s represented by the Palestinian Authority. Any move to full status would have to be agreed by the Security Council where the US has a veto.
Sir Keir has made clear he doesn’t accept Hamas – which he calls a “brutal terrorist organisation” – as a government in Gaza. The borders of such a state, wrangled over for decades during multiple rounds of negotiations between Israel and the Palestinians, are also not agreed.
Recognition is opposed by the Trump administration, as the US president made clear in London last week. US secretary of state Marco Rubio has said it would “embolden Hamas” and be symbolic only.
In Britain there is cynicism too. Kemi Badenoch, the Conservative leader, has accused the prime minister of a “desperate and insincere attempt to placate his backbenchers”. He heads to the party’s conference in Liverpool next week with a further slump in his approval ratings to -42%, around where Rishi Sunak’s was after his D-Day blunder.
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Could recognition of Palestine change the West Bank?
Other Labour MPs oppose the recognition move. The Labour Friends of Israel group has said: “It is important to recognise that Israel is not the only party to this conflict… Hamas could end this conflict tomorrow by releasing the hostages and laying down its arms.”
The move is also opposed by the families of the hostages in Gaza, of which 20 are believed to be alive – for not imposing their release as a condition on Hamas.
Ilay David, the brother of Evyatar David, who recently appeared emaciated in a Hamas video, said: “We want to meet with Starmer but he refuses to meet with us… Giving this recognition is like saying to Hamas: ‘It is OK you can keep starving the hostages, you can keep using them as human shields’. This kind of recognition gives Hamas power to be stubborn in negotiations. That is the last thing we need right now.”
Sir Ephraim Mirvis, the UK’s Chief Rabbi has said the “unconditional” recognition of the state “is not contingent upon a functioning or democratic Palestinian government, nor even upon the most basic commitment to a peaceful future”.
Image: Sir Keir Starmer welcomed Mahmoud Abbas, president of the Palestinian Authority, to 10 Downing Street earlier this month
What happens next?
Sir Keir met 89-year-old Mahmoud Abbas, the president of the Palestinian Authority, in London this month and they agreed Hamas should not be involved in the governance of Gaza.
Efforts to set up a transitional government have been discussed between the US and Gulf states. But Mike Huckabee, the US ambassador to Israel, said last week there was nothing “ready for signature”.
The UK government is expected to announce further sanctions on Hamas figures this week. But the Israeli government has already responded with fury to the prospect of recognition and it’s reported that retaliation could include further annexations in the West Bank.
The UK government sees this as an important diplomatic move with allies, when nothing else is moving the dial. But it can only be made once, and even supporters in government acknowledge that on the ground in Gaza it won’t immediately change very much.
Image: One of three Russian MiG-31 fighter jets in images shared by Sweden’s armed forces. Pic: Swedish Armed Forces
The three incursions into NATO airspace fuelled concerns about the potential expansion of Russia‘s three-year war in Ukraine and have been seen as an attempt by Moscow to test the military alliance’s response.
The incident over Poland prompted its prime minister, Donald Tusk, to warn that his country was the closest to “open conflict” it had been since the Second World War, while the UK announced it would provide Warsaw with extra air cover.
Two RAF Typhoons, supported by an RAF Voyager air-to-air refuelling plane, took off from RAF Coningsby, in Lincolnshire, on Friday night to defend Poland’s skies before returning safely early on Saturday morning.
Image: A Gerbera drone landed in a field in the Olesno region of Poland
Defence Secretary John Healey said the mission sends a clear signal that “NATO airspace will be defended”.
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“I’m proud of the outstanding British pilots and air crew who took part in this successful operation to defend our allies from reckless Russian aggression.”
He said the mission was “especially poignant” coming as the UK marks the 85th anniversary of the Battle of Britain – when Polish pilots came to the aid of the UK – this weekend.
The head of the RAF, Air Chief Marshal Harv Smyth, said: “This sortie marks the RAF’s first operational mission on Eastern Sentry, reinforcing the UK’s steadfast commitment to NATO and its allies.
“We remain agile, integrated, and ready to project airpower at range.”
The prime minister had called on Benjamin Netanyahu’s government to take substantive steps to end the “appalling situation in Gaza“, agree to a ceasefire, commit to a long-term sustainable peace, allow the UN to restart the supply of aid, and not annex the West Bank.
The Israeli foreign ministry furiously rejected his statement, with Mr Netanyahu claiming that “Starmer rewards Hamas‘s monstrous terrorism and punishes its victims”.
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Could recognition of Palestine change the West Bank?
Ilay David, brother of Hamas hostage Evyatar David, who was seen emaciated in a video last month, said giving recognition was “like saying to Hamas: ‘It is OK, you can keep starving the hostages, you can keep using them as human shields.’
“This kind of recognition gives Hamas power to be stubborn in negotiations. That is the last thing we need right now.”
There has been no ceasefire, and the situation in Gaza has deteriorated, with a declaration of a famine in Gaza City and the expansion of Israeli military operations.
Israel has launched a major ground offensive to seize all of Gaza City and destroy Hamas in an operation which has prompted widespread condemnation, with UK Foreign Secretary Yvette Cooper calling it “utterly reckless and appalling”.
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What changed in UK’s Gaza policy?
Earlier this month, a UN commission of inquiry concluded that Israel has committed genocide against Palestinians in Gaza. Israel said the claim was “distorted and false”.
The UK will join 147 of the 193 members of the UN who recognise Palestine ahead of the UN General Assembly in New York on Monday.
Other nations, including France, Australia and Canada, have said they plan to take the same step at the UN gathering as part of a broad international effort to put pressure on Israel.
During a joint news conference with the prime minister at Chequers on Thursday, Donald Trump said he disagreed with recognition, and US politicians have urged the UK and other allies to reverse their stance.
Image: Sir Keir Starmer is expected to deliver the announcement on Sunday. Pic: PA
Sky News understands that Israel is considering options in response to the UK’s decision, but the strength of that reaction is still under consideration.
Family members of some of the 48 hostages still in captivity, after Hamas and other militant groups stormed into Israel on 7 October 2023, have written an open letter to Sir Keir, condemning the move.
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Israel ramps up attacks on Gaza City
“Hamas has already celebrated the UK’s decision as a victory and reneged on a ceasefire deal,” they said.
“We write to you with a simple plea – do not take this step until our loved ones are home and in our arms.”
The UK government is understood to be looking at further sanctions on Hamas, and has demanded the group release all hostages, agree to an immediate ceasefire, accept it will have no role in governing Gaza, and commit to disarmament.