Extreme Temperature Diary Thursday June 25th, 2026/Main Topic: European Heatwave Ember Dire Notes

Today was the hottest day ever on record in France (nation avg). Parts of Paris hit 108°F, other cities hit 112! All-time France records total 214 this week! And the UK had its hottest June day ever at 97°. Few have Air Conditioning! #europe #heatwave (image via infoclimat)

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-24T23:17:12.961Z

Sacre Bleu! France 🇫🇷 at 112°F beats Florida’s all-time record high of 109°! And it’s further north by 20° lat. While that may seem crazy – and the heat in France is rare – because Florida is surrounded by water and so humid, it’s tougher to reach lofty highs than it is in a drier climate.

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-25T12:20:19.164Z

Extreme heat grips Europe as UK hits new June record, France shuts down nuclear reactors and deaths rise across continent – as it happened | Europe | The Guardian

  • Teachers in France are risking their own and students’ health in overheated schools as a severe heatwave sets new record temperatures, education unions said, urging staff to strike over “unacceptable working conditions”. Several teaching unions on Thursday issued a joint statement denouncing a “blatant lack of preparation” by the government, after teachers have had to work in classrooms where temperatures reached up to 40C.
  • The UK’s new provisional high of 36.4C (97.5F), recorded in Yeovilton, Somerset, surpassed Wednesday’s June record of 36.1C in Gosport, Hampshire, which had beaten the previous peak of 35.6C set in Southampton in 1976.
  • The Netherlands issued its first-ever red alert for heat for Friday, warning of “dangerous” conditions as a record-setting heatwave scorched EuropeThe national weather institute issued the alert for much of the country, where temperatures are forecast to reach 40C in some places.
  • Switzerland registered its hottest ever June temperature on Thursday, with 38C measured in the northern city of Basel, breaking a previous record of 36.9C set eight decades ago, the Swiss weather service said. “Temperatures exceeded 37C for the first time in Switzerland during the month of June, breaking a record set in 1947,” MeteoSuisse said on X, adding that “a temperature of 38C was even recorded at the Basel weather station”.
  • France’s main energy provider Thursday shut down two nuclear reactors as an environmental protection measure to avoid discharging too much hot water into rivers already warming in a record-breaking heatwave, AFP reported. Power plants critical to the country’s electricity production use river water to cool their reactors, which heats the water that is then released back into the river.
  • In France, a three-year-old has died after finding himself trapped in a car in the Paris region in extreme heat, a prosecutor said, the third such fatality this week, AFP reported. The boy had slipped into the family car while his father thought he was napping, then found himself unable to get out with the child lock in the town of Saint-Gratien, the prosecutor said, after a police source and civil defence also reported the death.
  • A heatwave sweeping Europe was starting to peak in Germany on Thursday, with several open-air events cancelled and temperatures expected to top 40C through the weekend, AFP reported. Large parts of the country are already under “severe to extreme heat stress” with temperatures soaring to around 37C, the German Weather Service (DWD) said.
  • Italy’s latest heatwave has claimed five lives in less than 24 hours, as temperatures climbed to 41C across much of the country. After a 57-year-old man died while working in a field near Lodi, outside Milan, on Tuesday, four more deaths were reported on Wednesday.
  • Over the past four days 212 people have died prematurely in Spain as a result of the heatwave, according to scientists using a system for monitoring mortality. As temperatures rise to 42C in some regions, often not falling below 30C at night, the June heatwave is breaking records that were set this time last year, making it the hottest June since 1950.
  • In Germany, the country’s rail operator Deutsche Bahn, or DB, offered passengers booked for this weekend an option to cancel their ticket free of charge. The option is available to all passengers who booked their tickets before 23 June, and were due to travel between today and 30 June.
  • The heatwave continues to disrupt the British education system with University College London, one of the UK’s largest universities, cancelling its student open days planned for Friday and Saturday, relieving thousands of prospective undergraduates and parents from travelling to central London.

Hospitals in England declare critical incidents as machines and IT fail in heat | NHS | The Guardian

Hospitals in England declare critical incidents as machines and IT fail in heat

Extreme weather breaks MRI scanners and cooling units, as workload rises for sleep-deprived staff on sweltering wards

NHS

The hot weather has also prompted a surge in admissions and people arriving at A&E, causing severe overcrowding in some places and exacerbating heat-related pressures on infrastructure.

Lots of people, especially older patients, are turning up having collapsed or with dehydration,” one physician said. “In terms of inpatients, the conditions are awful due to overcrowding. Very few places have air conditioning and staff are really struggling.”

Older patients in one geriatric ward had been forced to endure temperatures as high as 35C, a second doctor said. Even wards with built-in air conditioning were affected, as some units were shut down to prevent them being damaged by the extreme heat.

Another doctor said their workplace was “unfit to cope”, with patients and staff experiencing “awful conditions” in sweltering wards, clinics and corridors.

Lots of people, especially older patients, are turning up having collapsed or with dehydration,” one physician said. “In terms of inpatients, the conditions are awful due to overcrowding. Very few places have air conditioning and staff are really struggling.”

NHS staff were also navigating the challenge of providing care while sleep-deprived. Like much of the UK population, many have struggled to sleep this week. Some medics were unable to work because their children’s schools had closed.

Several NHS trusts in England have declared critical incidents as a direct result of the extreme heat. One hospital had done so after its machines failed in multiple areas, a doctor said. Labs used for testing were also affected and two linear accelerator machines, used to treat cancer patients, had stopped working amid the high temperatures.

The doctor said that although they were working in a relatively new care setting, it was “tacked on to an old Victorian hospital”, creating severe infrastructure challenges. “It’s hopeless, really,” they said.

The doctor also said their NHS trust had faced “major issues” with IT servers overheating on Wednesday. “We thought we were going to lose everything, so we were all asked to turn off non-essential computers and electrical equipment, including lights.”

Europeans grapple with scorching June heatwave – video
Europeans grapple with scorching June heatwave – video

In Portsmouth, the Queen Alexandra hospital declared a critical incident after extreme heat caused cooling units to fail, leading to “elevated temperatures” across the hospital.

The failure of the cooling units affected the hospital’s digital systems and critical clinical services, including operating theatres, cardiac catheter laboratories and diagnostic scanning facilities, Portsmouth hospitals university NHS trust said.

“The unprecedented pressures created by the current heatwave, combined with the failure of a number of our chiller units, have led to significant disruption across several of our services,” said the trust’s deputy chief executive, Mark Orchard.

Some planned care and appointments were cancelled, while patients attending appointments were advised to bring lots of water as the hospital was “very hot”.

In Norfolk, hundreds of patients had hospital appointments cancelled after MRI scanners stopped working in the extreme heat.

Norfolk and Norwich university hospitals NHS foundation trust declared a critical incident, saying cooling systems that kept its scanners running had been affected by the hot weather and humidity.

It said it currently had “no working MRI scanners” across its Norwich sites, including those at its main hospital and its community diagnostic centre.

Meanwhile, the London ambulance service said it had recorded the highest number of life-threatening emergencies in its history in a single day, “driven by the extreme heat”. Crews responded to a record 642 category one calls on Wednesday. Category one incidents include the most serious, life-threatening injuries and illnesses such as cardiac arrests and patients who are not breathing.

Dr Hilary Williams, the clinical vice-president of the Royal College of Physicians, said the impact on patients and staff exposed an NHS that was dangerously underprepared for this week’s extreme heat. “There are reports of older patients arriving at hospital having collapsed or with dehydration. Patients are facing overcrowding, and there are issues with machines, laboratories and kidney dialysis – all fundamental to providing safe patient care,” she said.

“The impact of heatwaves on staff cannot be overstated. There is a sense of foreboding when we see the weather forecast, because we know what is to come, and there is very little staff can do.”

She added: “It is not as simple as buying fans, which can present a fire risk when used alongside oxygen and may increase the spread of infection.”

The NHS was already under “enormous pressure” owing to rising demand and workforce shortages, Williams said. Coupled with an ageing estate, those challenges intensified with the arrival of record temperatures this week.

“As clinicians, there are immediate steps we can take to protect patients, such as reviewing medications that affect hydration and ensuring they are stored appropriately,” she said. “But this must be matched by system-level change – strengthening infrastructure and embedding resilience into NHS reform.”

Buildings must be upgraded to withstand extreme heat and other climate risks, she said. “Hospitals should be places of safety, not settings where extreme heat puts patients and staff at risk.”

The Department of Health and Social Care said all NHS trusts were required to have effective arrangements to deal with extreme heat. “Trusts are urgently coordinating responses to increased demand on health services and protecting vulnerable patients,” a spokesperson said.

Europe’s extreme heat is shutting down nuclear power plantswww.technologyreview.com/2026/06/24/1…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-06-25T10:17:25.753Z

Me on the heatwavewww.economist.com/science-and-…

Oliver Morton, Eater of Sun (@eaterofsun.bsky.social) 2026-06-24T22:17:18.021Z

I spoke with Geeta GuruMurthy of BBC World News Television about the record European heat wave and it's link to human-caused warming:youtu.be/d8vqO2J8WV0

Michael E. Mann (@michaelemann.bsky.social) 2026-06-25T18:17:11.842Z

This is a devastating piece on how awful it is to die of heat stroke. Share it with the air conditioning skeptics you know.I would LOVE to see someone with actual medical knowledge – so, not me – do a brutal piece like this from the perspective of an elderly disabled person dying without AC.

Faine Greenwood (@faineg.bsky.social) 2026-06-25T13:46:21.004Z

As the UK & EU swelters under record breaking heat, this recent @science.nature.org study shows that 🌳 are already mitigating half the urban heat effect! So actual heat = natural variability + climate change + UHI – cooling impact of 🌳But 🌳 benefits are not equitably distributed. Read more:

Katharine Hayhoe (@katharinehayhoe.com) 2026-06-25T13:38:24.532Z

Relevant chapter in The #NewClimateWar (bookshop.org/p/books/the-…)

Michael E. Mann (@michaelemann.bsky.social) 2026-06-25T18:14:50.671Z

And Mark Jacobson's work at Stanford: carbonherald.com/new-stanford…

Michael E. Mann (@michaelemann.bsky.social) 2026-06-25T18:01:56.680Z

FIFA World Cup: Climate Is The Loser – Highest Impact Everwww.forbes.com/sites/we-don… #ClimateChange #FIFA #WorldCup #ClimateImpact #GreenhouseEmissions

A Climate Change Podcast (@aclimatechange.bsky.social) 2026-06-25T02:18:00.801Z

Prof Philippe Ciais: The world’s most highly cited climate scientistinteractive.carbonbrief.org/cosmos/inter…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-06-25T09:50:42.004Z

Honored to be participating in @desmog.com 20th anniversary event on July 8🎂. I'll be joining @naomiaklein.bsky.social & @jimhoggan.bsky.social in a discussion of DeSmog's legacy of two decades of speaking truth to power and pushing back on climate deniers and climate denial: luma.com/snaz4qbo

Michael E. Mann (@michaelemann.bsky.social) 2026-06-25T14:37:53.701Z

Scientists & activists have been ringing the alarm since 1970s. It began with smog, pollution in cities, higher levels of CO2. Then ice caps melting, rising sea levels. Then more heatwaves, floods and wildfires. We need to stop fossil fuel subsidies and to invest in #renewables #ActOnClimate #Green

(@alexvonwitzleben.bsky.social) 2026-06-21T14:05:59.562Z

It's probably time European journalists wrapped their heads around Heat Index (temp + relative humidity). In high humidity, sweating is less efficient, making heat worse, e.g.:Experiencing 35°C in London UK (70% RH) is more dangerous than 50°C in Phoenix Arizona (15% RH)

Frank Swain (@frank-swain.bsky.social) 2026-06-24T10:22:02.477Z

Satellite imagery shows multiple large & fast-spreading wildfires in UT, NV, AZ, NM, & CO–including a large pyrocumulonimbus plume from #CottonwoodFire in UT. This is a concerning look heading into a 5+ day period of adverse fire weather conditions amid severe -extreme drought.

Daniel Swain (@weatherwest.bsky.social) 2026-06-24T00:24:58.000Z

Heat Levels Up! 2 mini heat domes will combine into one bigly mountain of heat across the US. From Chicago to Dalllas to Atlanta to Pittsburgh and everywhere in between get ready to feel the the triple digits. Pictured here are Heat Index numbers (not actual highs) for next week. #heatwave

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-24T13:05:00.335Z

TS Arthur's moisture dumped 29.06" in <12 hours at Cottonport, LA. According to weather historian Chris Burt, if confirmed by NOAA, this would be the highest official 12-hour rainfall in U.S. history. Unofficial record: 34.30" in Smethport, PA on July 18, 1942. 1/4

Dr. Jeff Masters (@drjeffmasters.bsky.social) 2026-06-25T00:58:30.310Z

Tropical Brew? Deep moisture focused on a front may act as a catalyst for tropical mischief near the Southeast US coast. Chances are low for a named system, but yes, I’m saying there’s a chance. The more important aspect for #Florida – hopefully – is increased / widespread rain chances next week 1/

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-25T12:53:45.655Z

With all the June runs in, here is how 13 different model expect the spatial evolution of tropical SST anomalies by November:

Zeke Hausfather (@hausfath.bsky.social) 2026-06-23T14:30:10.000Z

For the first time on record, solar generated more electricity than coal across the entire U.S. – despite active federal policy pushing the other direction. Read more at the link below!

Katharine Hayhoe (@katharinehayhoe.com) 2026-06-24T20:20:03.902Z

This spring, one part of 🇺🇸 Colorado actually hit 100% clean electricity for a while by combining #wind, #solar, and #hydropower. Pretty cool to see a community prove that #renewables can keep the lights on without fossil fuels, even if just for a season. ⚡

Whoa 🤯 in Slow-Mo (@0lsi.bsky.social) 2026-06-21T01:07:06.062Z

Trump admin abandons fight against wind energy as clean energy output surgesLegal victories have dampened the Trump admin’s efforts to halt wind and solar power. arstechnica.com/science/2026… #wind #windpower #cleanenergy #renewables

Future Timeline (@futuretimeline.bsky.social) 2026-06-21T07:50:25.081Z

Europeans are making the most of cheap solar panels – by creating green garden fences#renewables #solar #energysky flip.it/S7MMN6

Paul Below (@paulbelow.bsky.social) 2026-06-21T16:45:55.917Z

EU Electricity Generation – June 20, 202655.22% of EU electricity generation was renewable.Wind: 11.67% Nuclear: 23.40%Hydro: 17.75% Gas: 12.44%Solar: 22.73% Coal: 7.78%eu-electricity.eu#EU #Renewables #Electricity #EnergySky #ClimateSky

EU Electricity (@eu-electricity.bsky.social) 2026-06-21T12:27:58.714865+00:00

Gina Rinehart’s companies acknowledge mining is essential to net zero, yet her public attacks on renewables and Pauline Hanson’s anti-climate agenda clash with the reality that mining projects increasingly depend on clean energy, Giles Parkinson writes. #auspol #Climate #Renewables

Pearls and Irritations (@johnmenadue.com) 2026-06-23T01:24:38.299084+00:00

Three more French EDF reactors go down with heat wave.Nuclear climate casualty.www.franceinfo.fr/environnemen…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-06-25T14:23:02.152Z

“Critical” state may return for French reactors on new heat threat in July.Nuclear climate casualty.montelnews.com/news/451b927…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-06-25T14:19:28.930Z

⚒️ 🧪 A catastrophic earthquake just struck northern Venezuela. Large buildings have collapsed, and the USGS PAGER is forecasting thousands of fatalities. Our colleague in Caracas, Dr. Frank Audemard, has shared with us what the earthquake felt like and footage from the region. Here’s what we know.

Dr. Judith Hubbard (@judithgeology.bsky.social) 2026-06-25T02:33:00.075Z

Move away from fossil fuels perhaps? Just a thought. www.nytimes.com/2026/06/25/b…

Gavin Schmidt (@climateofgavin.bsky.social) 2026-06-25T11:15:26.756Z

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