Hurricanes becoming significantly more intense due to climate change requires a new category six classification, a new study has warned.
Currently, the Saffir-Simpson hurricane wind scale measures a hurricane’s maximum sustained wind speed.
Introduced in the 1970s by the National Hurricane Center (NHC) in the US, it ranges from one to five, the lowest number covering 74-95mph winds and warning of some damage and the highest number predicting “catastrophic” damage with winds measuring 157mph or higher.
Please use Chrome browser for a more accessible video player
0:40
October 2023: Hurricane Otis hits Mexico’s east coast
But a new study published in the Proceedings of the National Academy of Sciences has proposed a hypothetical category six hurricane as a result of “record wind speeds” due to the planet warming.
Authors Michael Wehner and James Kossin criticised the Saffir-Simpson scale for being too “open-ended” which can lead to an underestimation of risk.
Instead, the study recommends extending the requirements for a category five hurricane to cover wind speeds of 157-192mph, with the new category six for winds greater than 192mph.
Referring to hurricanes as intense tropical cyclones (TCs), the study said: “We investigate considering the extension to a 6th category of the Saffir-Simpson hurricane wind scale to communicate that climate change has caused the winds of the most intense TCs to become significantly higher.”
It reported that in the past decade, five storms have exceeded the proposed category six range, including Typhoon Haiyan,which hit the Philippines in 2013, bringing winds of 195mph, and Mexico’s Hurricane Patricia in 2015.
Advertisement
“192mph is probably faster than most Ferraris, it’s hard to even imagine,” Mr Wehner, a scientist at the Lawrence Berkeley National Laboratory, said, according to The Guardian.
Mr Kossin, of the University of Wisconsin-Madison, added: “Being caught in that sort of hurricane would be bad. Very bad.”
Scientists have previously warned that climate change is making extreme weather events more frequent and severe. This includes hurricanes and storm surges – a rise in sea level caused by wind and atmospheric pressure changes.
Spreaker
This content is provided by Spreaker, which may be using cookies and other technologies.
To show you this content, we need your permission to use cookies.
You can use the buttons below to amend your preferences to enable Spreaker cookies or to allow those cookies just once.
You can change your settings at any time via the Privacy Options.
Unfortunately we have been unable to verify if you have consented to Spreaker cookies.
To view this content you can use the button below to allow Spreaker cookies for this session only.
In 2022, Hannah Thomas-Peter, Sky News’ climate change and energy correspondent, explained that more heat means more evaporation, which means more moisture in clouds and therefore more intense rainfall.
An increase in ocean temperatures can also make hurricanes more powerful, as the heat from the surface of the water transfers energy to the storm as it heads towards land.
However, there is no clear consensus on whether global warming is currently having any measurable impact on tropical cyclones, according to the Met Office.
Donald Trump has described crucial trade talks with Chinese President Xi Jinping as “amazing” – and says he will visit Beijing in April.
The leaders of the world’s two biggest economies met in South Korea as they tried to defuse growing tensions – with both countries imposing aggressive tariffs on exports since the president’s second term began.
Aboard Air Force One, Mr Trump confirmed tariffs on Chinese goods exported to the US will be reduced, which could prove much-needed relief to consumers.
It was also agreed that Beijing will work “hard” to stop fentanyl flowing into the US.
Semiconductor chips were another issue raised during their 100-minute meeting, but the president admitted certain issues weren’t discussed.
“On a scale of one to 10, the meeting with Xi was 12,” he told reporters en route back to the US.
Please use Chrome browser for a more accessible video player
2:08
‘Their handshake was almost a bit awkward’
Xi a ‘tough negotiator’, says Trump
The talks conclude a whirlwind visit across Asia – with Mr Trump saying he was “too busy” to see Kim Jong Un.
However, the president said he would be willing to fly back to see the North Korean leader, with a view to discussing denuclearisation.
Mr Trump had predicted negotiations with his Chinese counterpart would last for three or four hours – but their meeting ended in less than two.
The pair shook hands before the summit, with the US president quipping: “He’s a tough negotiator – and that’s not good!”
It marks the first face-to-face meeting between both men since 2019 – back in Mr Trump’s first term.
Image: Donald Trump and Xi Jinping. Pic: AP
There were signs that Beijing had extended an olive branch to Washington ahead of the talks, with confirmation China will start buying US soybeans again.
American farmers have been feeling the pinch since China stopped making purchases earlier this year – not least because the country was their biggest overseas market.
Chinese stocks reached a 10-year high early on Thursday as investors digested their meeting, with the yuan rallying to a one-year high against the US dollar.
Analysis: A fascinating power play
Sky News Asia correspondent Helen-Ann Smith – who is in Busan where the talks took place – said it was fascinating to see the power play between both world leaders.
She said: “Trump moved quickly to dominate the space – leaning in, doing all the talking, even responding very briefly to a few thrown questions.
“That didn’t draw so much as an eyebrow raise from his counterpart, who was totally inscrutable. Xi does not like or respond well to unscripted moments, Trump lives for them.”
Please use Chrome browser for a more accessible video player
2:43
Will Trump really run for a third term?
On Truth Social, Mr Trump had described the summit as a gathering of the “G2” – a nod to America and China’s status as the world’s two biggest economies.
While en route to see President Xi, he also revealed that the US “Department of War” has now been ordered to start testing nuclear weapons for the first time since 1992.
Tens of thousands of people have been killed in the Sudanese city of Al Fashir by the Rapid Support Forces (RSF) in a two-day window after the paramilitary group captured the regional capital, analysts believe.
Sky News is not able to independently verify the claim by Yale Humanitarian Labs, as the city remains under a telecommunications blackout.
Stains and shapes resembling blood and corpses can be seen from space in satellite images analysed by the research lab.
Image: Al Fashir University. Pic: Airbus DS/2025
Image: Al Fashir University. Pic: Airbus DS/2025
Nathaniel Raymond, executive director of Yale Humanitarian Labs, said: “In the past 48 hours since we’ve had [satellite] imagery over Al Fashir, we see a proliferation of objects that weren’t there before RSF took control of Al Fashir – they are approximately 1.3m to 2m long which is critical because in satellite imagery at very high resolution, that’s the average length of a human body lying vertical.”
Mini Minawi, the governor of North Darfur, said on X that 460 civilians have been killed in the last functioning hospital in the city.
The Sudan Doctors Network has also shared that the RSF “cold-bloodedly killed everyone they found inside Al Saudi Hospital, including patients, their companions, and anyone else present in the wards”.
World Health Organisation (WHO) chief Dr Tedros Adhanom Ghebreyesus said it was “appalled and deeply shocked” by the reports.
Satellite images support the claims of a massacre at Al Saudi Hospital, according to Mr Raymond, who said YHL’s report detailed “a large pile of them [objects believed to be bodies] against a wall at one building at Saudi hospital. And we believe that’s consistent with reports that patients and staff were executed en masse”.
In a video message released on Wednesday, RSF commander Mohamed Hamdan Dagalo acknowledged “violations in Al Fashir” and claimed “an investigation committee should start to hold any soldier or officer accountable”.
Please use Chrome browser for a more accessible video player
3:00
Army soldiers ‘fled key Sudan city’ before capture
Image: The Saudi Maternity Hospital in Al Fashir. Pic: Airbus DS /2025 via AP
The commander is known for committing atrocities in Darfur in the early 2000s as a Janjaweed militia leader, and the RSF has been accused of carrying out genocide in Darfur 20 years on.
Sources have told Sky News the RSF is holding doctors, journalists and politicians captive, demanding ransoms from some families to release their loved ones.
One video shows a man from Al Fashir with an armed man kneeling on the ground, telling his family to pay 15,000. The currency was not made clear.
In some cases, ransoms have been paid, but then more messages come demanding that more money be transferred to secure release.
Muammer Ibrahim, a journalist based in the city, is currently being held by the RSF, who initially shared videos of him crouched on the ground, surrounded by fighters, announcing his hometown had been captured under duress.
He is being held incommunicado as his family scrambles to negotiate his release. Muammer courageously covered the siege of Al Fashir for months, enduring starvation and shelling.
The Committee to Protect Journalists regional director Sara Qudah said the abduction of Muammar Ibrahim “is a grave and alarming reminder that journalists in Al Fashir are being targeted simply for telling the truth”.