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An unusual weather effect is likely to bring unseasonably warm temperatures back to the UK this week.

The Foehn effect could see temperatures spike back up in parts of northern Scotland on Wednesday.

Following on from the hottest weekend of the year so far, temperatures have dropped back down to the mid-to-high teens.

But forecasters have warned that parts of northern Scotland could see temperatures climb back up to 24C or even 25C – well above the seasonal average.

This could take place due to the Foehn effect, which is where air on the downwind (or lee) side of a mountain is warmer and drier than air on the other side.

When the air is forced up over a mountain, it cools and condenses to form clouds, bringing rain to the upwind side of a mountain.

When the air then descends down the other side, it’s much drier and that means it ends up warmer.

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The size and shape of a mountain, along with the upstream wind speed, temperature and humidity all play a part in how much warmth is seen on the downwind side.

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A number of other factors can help increase the temperature on the downwind side of the mountain as well, such as air being drawn down from aloft, vertical mixing of air at the top of the mountain and radiative warming – due to sunnier conditions on the downwind side.

The Foehn effect can be seen in mountainous regions across the world.

In the areas where the impacts are greatest, local names are given to it.

The Chinook affects the Rockies in North America, while the Zonda impacts the Andes in South America.

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According to the US National Weather Service, a Foehn event in 1972 caused the temperature in the US state of Montana to rise from -48C to 9C, an increase of 57C.

The increase in temperature can have detrimental effects, bringing the risk of avalanches, glacial melting, downstream flooding and wildfires.

For the UK, the prevailing westerly wind means the Scottish Highlands tend to see the most notable Foehn events.

One occurred in January this year, which allowed Achfary to reach a high of 19.9C, provisionally the UK’s highest temperature for January.

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Two women and dog killed after Christmas Day ‘stabbing’ at flat in Milton Keynes

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Two women and dog killed after Christmas Day 'stabbing' at flat in Milton Keynes

Two women have died following reports of a stabbing in Milton Keynes on Christmas Day, police have said.

A dog injured in the incident in Bletchley also died after being taken to the vets.

A man and a teenage boy suffered serious injuries.

A 49-year-old man from Milton Keynes has been arrested on suspicion of murder and attempted murder and remains in custody.

A police forensic officer at the scene near an apartment block on Santa Cruz Avenue in Newton Leys, near Bletchley.
Pic: PA
Forensic officers at the scene near an apartment block on Santa Cruz Avenue in Newton Leys, near Bletchley.
Pic: PA
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Forensic officers at the scene. Pics: PA

Officers were called to a block of apartments in Santa Cruz Avenue just after 6.30pm on Christmas Day following reports of a stabbing.

The two women, aged 38 and 24, died at the scene, Thames Valley Police said. Their next of kin have been informed.

The injured man and teenage boy were taken to hospital and are both in a stable condition.

Police said the parties are known to each other.

Senior investigating officer Detective Chief Inspector Stuart Brangwin said: “Firstly I would like to extend my deepest condolences to the families of the women who have tragically died in this shocking incident.

“We have launched a double murder investigation, which may be concerning to the wider public; however, we have made an arrest and are not looking for anyone else in connection with this incident and the parties are known to each other.”

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Man arrested after woman in her 80s killed in Christmas Day motorway crash

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Man arrested after woman in her 80s killed in Christmas Day motorway crash

A man has been arrested after a woman in her 80s was killed in a Christmas Day motorway crash.

A white Ford Fiesta and a black Volkswagen Tiguan collided on the A1(M) near Darlington just after 8.30pm, North Yorkshire Police said.

The passenger of the Ford Fiesta, a woman in her 80s from the Durham area, suffered serious injuries and died at the scene.

The car’s driver, a man in his 80s from the Durham area, was taken to hospital in a serious but stable condition.

The driver of the Volkswagen, a man in his 20s from the Durham area, was arrested on suspicion of causing death by dangerous driving.

He has now been released under investigation.

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The motorway was closed until around 8am on Boxing Day for collision investigators and National Highways to assess the road surface.

It is now open in both directions but with a lane closure still in place as of 9.30am.

Police have appealed for witnesses and dashcam footage of the crash, which happened on the northbound carriageway between Junction 57 (A66(M) junction) and Junction 58 (Merrybent).

The force also thanked members of the public who assisted at the scene.

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Man charged with murder after missing woman’s body found in Bolton

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Man charged with murder after missing woman's body found in Bolton

A man has been charged with murdering a woman whose body was found nine days after she went missing.

Police said extensive searches and appeals were launched to find Mariann Borocz after she vanished on 14 December.

Her body was discovered at a property in Bolton, Greater Manchester, on Christmas Eve.

Christopher Barlow, 61, from Bolton, has been charged with her murder and has been remanded in custody ahead of an appearance before magistrates on Thursday.

Greater Manchester Police said Ms Borocz’s family are being supported by specialist officers.

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Detective Chief Inspector Tony Platten thanked those who spoke to officers and shared the missing person appeals.

“On behalf of the entire investigation team, our condolences remain with Mariann’s family as they try to come to terms with her death,” he said.

“Our investigation is moving at pace, and we are continuing to work hard to build a full timeline of events leading up to Mariann’s death.

“As part of our investigation, we are once again appealing for additional information from the local community.”

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