What is cloud seeding and did it cause record rainfall in Dubai?

Published

12 months ago

April 18, 2024

admin

A record amount of rainfall was said to have caused “absolute carnage” in Dubai on Tuesday – with schools closed, flights suspended and people working from home.

More than 14cm (5.6 inches) of rain soaked the United Arab Emirates (UAE) city on Tuesday – the heaviest rainfall there since records began in 1949, the state-run WAM news agency said.

As people in Dubai continue to face disruption due to the downpours, some have suggested the rain could have been caused by a practice carried out by humans known as “cloud seeding”.

Here we take a look at what the process involves and whether it was responsible for Dubai’s wet Tuesday.

What is cloud seeding?

The practice is a type of weather modification process whereby small planes fly through clouds burning salt flares which can increase precipitation to help make it rain.

The UAE, located in one of the hottest and driest regions on Earth, has been leading the effort to seed clouds and increase precipitation.

Did cloud seeding cause the storm?

Following the downpour, several reports quoted meteorologists at the National Centre for Meteorology, the UAE’s meteorology agency, as saying they flew six or seven cloud seeding flights before the rain.

Flight-tracking data showed that one aircraft linked to the UAE’s cloud seeding efforts flew around the country on Sunday.

However, the meteorology agency told Reuters news agency there were no such operations before the storm.

It comes as a number of experts have also said it is unlikely the downpours would have been caused by cloud seeding.

What have the experts said?

Sky News weather producer Chris England said he doubted cloud seeding contributed to the downpour, as the evidence of the practice working is “pretty slim at best”.

He added: “Some studies have indicated climate change will bring an increase in rainfall to the area.”

Friederike Otto, a senior lecturer in climate science at Imperial College London, also said it was misleading to talk about cloud seeding as the cause of the rainfall.

“Cloud seeding can’t create clouds from nothing. It encourages water that is already in the sky to condense faster
and drop water in certain places. So first, you need moisture,” she said.

“Without it, there’d be no clouds.”

Update:
TOWIE stars stranded by floods forced to hitchhike

Ms Otto added that rainfall was becoming much heavier around the world as the climate warms because a warmer atmosphere can hold more moisture.

Professor John Marsham, Met Office joint chair at the University of Leeds, said speculation around cloud seeding is a “distraction from the real story here”.

“We know that man-made climate increases extreme rainfall – this is well understood physics as warm air holds more water.

“A rainfall event such as the one that caused the Dubai floods, which covered a large area and where over Dubai a year’s worth of rain fell in one day, cannot happen without large-scale weather conditions driving enormous convergence of water vapour in the atmosphere and so extreme rainfall.

“Any possible effect of any cloud seeding in these circumstances would be tiny.”

Professor Maarten Ambaum, a meteorologist at the University of Reading who has studied rainfall patterns in the Gulf region, said: “The UAE does have an operational cloud seeding programme to enhance the rainfall in this arid part of the world, however, there is no technology in existence that can create or even severely modify this kind of rainfall event.”

If it wasn’t cloud seeding – what did cause the storm?

Prof Ambaum said the UAE is characterised by long periods without rain and then “irregular, heavy rainfall”.

He added: “These storms appear to be the result of a mesoscale convective system – a series of medium-sized thunderstorms caused by massive thunderclouds, formed as heat draws moisture up into the atmosphere. These can create large amounts of rain, and when they occur over a wide area and one after another, can lead to seriously heavy downpours. They can rapidly lead to surface water floods, as we have seen in places such as Dubai airport.”

Meanwhile, climate scientists say that rising global temperatures, caused by human-led climate change, are leading to more extreme weather events around the world, including intense rainfall.

Esraa Alnaqbi, a senior forecaster at the UAE’s National Centre of Meteorology, has said climate change likely contributed to the storm.

She said the Dubai downpour came after a low pressure system in the upper atmosphere and low pressure at the surface acted like a pressure “squeeze” on the air.

That squeeze, intensified by the contrast between warmer temperatures at ground level and colder temperatures higher up, created the conditions for the powerful thunderstorm, she said.

World

Stock markets slump for second day running after Trump announces tariffs – in worst day for indexes since COVID

Published

8 hours ago

April 4, 2025

admin

Stock markets slump for second day running after Trump announces tariffs - in worst day for indexes since COVID

Worldwide stock markets have plummeted for the second day running as the fallout from Donald Trump’s global tariffs continues.

While European and Asian markets suffered notable falls, American indexes were the worst hit, with Wall Street closing to a sea of red on Friday following Thursday’s rout – the worst day in US markets since the COVID-19 pandemic.

As it happened: Worst week’s trading in five years

All three of the US’s major indexes were down by more than 5% at market close; The Dow Jones Industrial Average plummeted 5.5%, the S&P 500 was 5.97% lower, and the Nasdaq Composite slipped 5.82%.

The Nasdaq was also 22% below its record-high set in December, which indicates a bear market.

Read more: What’s a bear market?

Ever since the US president announced the tariffs on Wednesday evening, analysts estimate that around $4.9trn (£3.8trn) has been wiped off the value of the global stock market.

Mr Trump has remained unapologetic as the markets struggle, posting in all-caps on Truth Social before the markets closed that “only the weak will fail”.

The UK’s leading stock market, the FTSE 100, also suffered its worst daily drop in more than five years, closing 4.95% down, a level not seen since March 2020.

And the Japanese exchange Nikkei 225 dropped by 2.75% at end of trading, down 20% from its recent peak in July last year.

Trump holds trade deal talks – reports

It comes as a source told CNN that Mr Trump has been in discussions with Vietnamese, Indian and Israeli representatives to negotiate bespoke trade deals that could alleviate proposed tariffs on those countries before a deadline next week.

The source told the US broadcaster the talks were being held in advance of the reciprocal levies going into effect next week.

Vietnam faced one of the highest reciprocal tariffs announced by the US president this week, with 46% rates on imports. Israeli imports face a 17% rate, and Indian goods will be subject to 26% tariffs.

China – hit with 34% tariffs on imported goods – has also announced it will issue its own levy of the same rate on US imports.

Mr Trump said China “played it wrong” and “panicked – the one thing they cannot afford to do” in another all-caps Truth Social post earlier on Friday.

Later, on Air Force One, the US president told reporters that “the beauty” of the tariffs is that they allow for negotiations, referencing talks with Chinese company ByteDance on the sale of social media app TikTok.

He said: “We have a situation with TikTok where China will probably say, ‘We’ll approve a deal, but will you do something on the tariffs?’

“The tariffs give us great power to negotiate. They always have.”

World

Financial markets were always going to respond to Trump tariffs but they’re also battling with another problem

Published

12 hours ago

April 4, 2025

admin

Financial markets were always going to respond to Trump tariffs but they're also battling with another problem

Global financial markets gave a clear vote of no-confidence in President Trump’s economic policy.

The damage it will do is obvious: costs for companies will rise, hitting their earnings.

The consequences will ripple throughout the global economy, with economists now raising their expectations for a recession, not only in the US, but across the world.

Tariffs latest: FTSE 100 suffers biggest daily drop since COVID

Financial investors had been gradually re-calibrating their expectations of Donald Trump over the past few months.

Hopes that his actions may not match his rhetoric were dashed on Wednesday as he imposed sweeping tariffs on the US’ trading partners, ratcheting up protectionism to a level not seen in more than a century.

Markets were always going to respond to that but they are also battling with another problem: the lack of certainty when it comes to Trump.

He is a capricious figure and we can only guess his next move. Will he row back? How far is he willing to negotiate and offer concessions?

These are massive unknowns, which are piled on to uncertainty about how countries will respond.

China has already retaliated and Europe has indicated it will go further.

That will compound the problems for the global economy and undoubtedly send shivers through the markets.

Much is yet to be determined, but if there’s one thing markets hate, it’s uncertainty.

World

Court confirms sacking of South Korean president who declared martial law

Published

1 day ago

April 4, 2025

admin

Court confirms sacking of South Korean president who declared martial law

South Korea’s constitutional court has confirmed the dismissal of President Yoon Suk Yeol, who was impeached in December after declaring martial law.

His decision to send troops onto the streets led to the country’s worst political crisis in decades.

The court ruled to uphold the impeachment saying the conservative leader “violated his duty as commander-in-chief by mobilising troops” when he declared martial law.

The president was also said to have taken actions “beyond the powers provided in the constitution”.

Supporters and opponents of the president gathered in their thousands in central Seoul as they awaited the ruling.

The 64-year-old shocked MPs, the public and international allies in early December when he declared martial law, meaning all existing laws regarding civilians were suspended in place of military law.

After suddenly declaring martial law, Mr Yoon sent hundreds of soldiers and police officers to the National Assembly.

He has argued that he sought to maintain order, but some senior military and police officers sent there have told hearings and investigators that Mr Yoon ordered them to drag out politicians to prevent an assembly vote on his decree.

His presidential powers were suspended when the opposition-dominated assembly voted to impeach him on 14 December, accusing him of rebellion.

The unanimous verdict to uphold parliament’s impeachment and remove Mr Yoon from office required the support of at least six of the court’s eight justices.

South Korea must hold a national election within two months to find a new leader.

Lee Jae-myung, leader of the main liberal opposition Democratic Party, is the early favourite to become the country’s next president, according to surveys.