Almost-global-average sea-surface temperatures are creeping up to record levels again and we’re still in La Niña (according to NOAA). There’s some uncertainty though as you can see from these two datasets..

Cloudiness has been declining globally for the last two decades. Why is this and how does it matter for global warming? Read our new article to find out! 👇 doi.org/10.5194/acp-26-4153-2026 And see the @carbonbrief.org post summarising the key findings buff.ly/oLxKacO

Excellent summary on our study in @nature.com by @ayeshatandon.carbonbrief.org (@carbonbrief.org) with comments from Rowan Sutton, Karen McKinnon and @robertvautard.bsky.social www.carbonbrief.org/limiting-glo...

Extreme global climate outcomes are possible even at 2°C of warming In our new Nature study led by @bevacquae.bsky.social with Jakob Zscheischler and @janasillmann.bsky.social, we show that even moderate warming of 2°C could lead to extreme outcomes. www.nature.com/articles/s41...

The current heatwave in the US Southwest is utterly destroying many records for this time of year. Phoenix, Arizona has ~90 years of daily temperature data, and yet recent temperatures beat the previous March record by 5 °F (2.8 °C), and would actually tie the record for April.

Honestly, this historic heat dome across the West is really hard to put into words for me. Temperatures over 110°F (43°C) in March, shattering all-time monthly records on multiple consecutive days, and not just by a little. ➡️ I can confirm this is human-caused climate change. polarwx.com/models/

New discussion paper just dropped that’s taken shall we say a little work to get this far … essd.copernicus.org/preprints/es... please be kind. Not on an at all sensitive topic in the slightest.

Globally, no single day in 2025 was cooler than its 1991-2020 average. climate.copernicus.eu/global-clima...

Most 2025 global temperatures are now out (degrees C above 1850-1900 baseline) 1.41 HadCRUT5 1.44 Berkeley 1.46 JRA-3Q 1.47 Copernicus 1.53 DCENT-I NOAA and NASA GISS values will be public at 2pm UK time and but based on already public Jan-Nov data they will likely be between 1.3 and 1.4 degC.

2025 global climate highlights are out: 🌡️ 2025 was 3rd warmest year on record, 1.47ºC above the preindustrial level 📈 2023-2025 is the first three year period above 1.5ºC (according to ERA5) 🌍 The last 11 years have been the warmest 11 years on record See: climate.copernicus.eu/global-clima... ⚒️🧪🌊

Hot off the press in the journal Science Advances: A new era of bioclimatic extremes in the terrestrial Arctic www.science.org/doi/10.1126/... Our new paper was published today!

The Trump Administration's plan to dismantle the @ncar-ucar.bsky.social is senseless & dangerous. It would weaken weather forecasting, climate research, & the science that keeps people safe. We urge that this plan be abandoned. Call Congress to #SaveNCAR today. buff.ly/7ka1BQA

It appears that the U.S. Environmental Protection Agency (EPA) has, within the past week, scrubbed a large amount of climate change content from its official website, as well as *removed human-caused warming* from the discussion on its "causes of climate change" page.

Starting the first lead author meeting of the @Ipcc #AR7 report in Paris! For the first time, WG1, WG2 and WG3 meet together in a lead author meeting. Great to see so much expertise and enthusiasm to kick off the next report.

Many thanks to the fantastic team of PhD and MSc students, postdocs, IT and administrative staff and colleagues at @ethz.ch and across the world who helped to make this possible. I am very honored to be listed again. Special thanks to the @usyseth.bsky.social for the excellent research environment.

Climate skeptics have long been obsessed with corrections to temperature records for changes in measurement techniques and instruments over time. But it turns out that if we just used the raw data we'd see more warming. My latest at The Climate Brink: www.theclimatebrink....

A bit farther ahead, it's increasingly looking like a rather extreme late-season ridge & heatwave event may develop over Pacific NW & British Columbia in about a week--with some degree of anomalous warmth extending across most of the West (including California). #CAwx #ORwx #WAwx

Numerical weather prediction models (ECMWF IFS) still outperform AI weather models in forecasting record-breaking hot and cold extremes and unseen wind extremes Preprint arxiv.org/abs/2508.15724 with Zhongwei Zhang @erichfischer.bsky.social @zscheischlerjak.bsky.social and Sebastian Engelke

Wetterextreme und Sommer 2025 Ich war gestern Gast im SRF Tagesgespräch bei Karoline Arn. Ich habe die Wetterereignisse des Sommers 2025 eingeordnet und über unsere laufende Forschung am @usyseth.bsky.social der @ethz.ch gesprochen. www.srf.ch/audio/tagesg...

Honoured to be appointed Lead Author of IPCC #AR7 for the chapter 7 on "Projections of regional climate and extremes". I am looking forward to contribute together with my @usyseth.bsky.social colleague @lukasgudmundsson.bsky.social and IPCC WG1 vice-chair @soniaseneviratne.bsky.social

📣 New paper: 💧💧💧 In July 2021 record breaking rainfall hit western Europe, we use ensemble boosting to explore different plausible storylines. These show it could have rained for longer, or over a larger area, or in a different place. Are we prepared? doi.org/10.1038/s432...

🌧️The July 2021 extreme rainfall in Western Europe was near the upper bound of plausibility in the current climate, though alternative storylines reveal more severe potential outcomes. @vikkithompson.bsky.social @hancloke.bsky.social @erichfischer.bsky.social 👉 www.nature.com/articles/s43...

Schon 34.5°C um 13:40 in Basel! Ohne Gewitter dürfte es ein sehr warmes Eröffnungsspiel der Schweiz an der #WEURO2025 werden.

In about 4 days from now, we are going to hit the #Glacier Loss Day in Switzerland! All melting from this point onwards till next winter is unsustainable, i.e. is long-term mass loss. This is extremely early in the season! And just a bit behind the record-shattering year 2022...

Viermal mehr Hitzerekorde als ohne Klimawandel Eigentlich gilt: Je länger die Messreihen, desto seltener neue Rekorde. Doch das Gegenteil ist der Fall – wie wir in unserem Reviewartikel in Nature Reviews Earth & Environment zeigen. Blog: www.carbonbrief.org/guest-post-h... Paper: rdcu.be/et273

🔥 Hitzewellen werden häufiger & intensiver – und belasten die Gesundheit, Landwirtschaft & Infrastruktur. Besonders gefährdet: ältere & verletzliche Menschen. 💧 Auch Trockenheit & Wassermangel nehmen zu. Die CH muss sich anpassen. 👉https://dieumwelt.ch/artikel/klimarisiken-in-der-schweiz

Die gegenwärtige #Hitze führt zu zunehmendem Temperaturstress für #Fische in #Schweizer #Fliessgewässern, insbesondere in der Thur, Goldach, Broye und Tresa. Mehr auf www.drought.ch/de/impakt-vo... des Projektes #MaLeFix der @wslresearch.bsky.social. @hydrologywsl.bsky.social @eawag.bsky.social

New paper in ERL! We study the importance of resolution for the representation of climate extremes. We use a new generation of km-scale models to show that many important details about temperature and precipitation extremes are hidden at CMIP6-like resolutions. doi.org/10.1088/1748...

High warming rate fuels record-breaking weather The longer our measurements, the fewer record-breaking events we should observe. The opposite is the case - many more records and higher record margins I summarise the key takeaways of our ‪@natrevearthenviron.nature.com article in a guest post.

NEW – Guest post: How climate change is fuelling record-breaking extreme weather | @erichfischer.bsky.social‬ Read here: buff.ly/bnrSvQN

Happy to share our paper in ‪@science.org‬ 'Observed trend in Earth energy imbalance may provide a constraint for low climate sensitivity models' | Science www.science.org/doi/10.1126/...

⚒️ Article: Flash droughts that are accompanied by extreme heat drive more severe and prolonged impacts on global ecosystems @erichfischer.bsky.social @ethz.ch @louiseslater.bsky.social @sebastian-sippel.bsky.social @retoknutti.bsky.social www.nature.com/articles/s41...

Will you live an unprecedented life? In our new paper in @nature.com and accompanying @savethechildren.org report, we detect who will face unprecedented lifetime exposure to climate extremes (🧵) 1/n Report: resourcecentre.savethechildren.net/document/bor... Paper: www.nature.com/articles/s41...

Our children will face unprecedented exposure to weather extremes. Our paper led by Luke Grant and @wimthiery.bsky.social published in @nature.com shows that the generation of our children and grandchildren will be exposed to a lot more weather extremes than ours. www.nature.com/articles/s41...

or in the Carbon Brief article: www.carbonbrief.org/children-bor... Grateful and proud to have contributed to this important study, led by Luke Grant and @wimthiery.bsky.social , with @soniaseneviratne.bsky.social and @erichfischer.bsky.social

📢 Hot off the press: our new study in Nature, led by Luke Grant and @wimthiery.bsky.social, shows how climate change is redefining what it means to live an "unprecedented life"—facing climate extremes that would have been nearly impossible without human influence. www.nature.com/articles/s41...

🚨 Research by VUB and ETH Zurich shows millions of children will suffer most from heatwaves, crop failures, floods, fires and storms due to climate change. We must act now to protect their future! ➡️ go.ethz.ch/2i

@wimthiery.bsky.social presenting our new paper "Global emergence of unprecedented lifetime exposure to climate extremes" at #EGU25. Stay tuned for the paper led by Luke Grant, @innevanderkelen.bsky.social, @soniaseneviratne.bsky.social, @lukasgudmundsson.bsky.social published on 8 May.

#EGU25 is about to start! If you're there, check out our session on High-impact Climate Extremes on Tuesday, room 🟨 F1 🧪: meetingorganizer.copernicus.org/EGU25/sessio... With many exciting talks, including the CL Division Outstanding ECS Award Lecture by @kornhuber.bsky.social

Super excited to be presenting our ensemble boosting work, 'Imagine rain falling in a different place', in this session:

Yet another record-shattering temperature extreme

Five years ago today, most historical UK monthly rainfall observations were not available to scientists. But the 66,000 pieces of paper containing the data had been scanned. With covid lockdown approaching we saw an opportunity to transcribe the data. #RainfallRescue began... 🧵

If greenhouse gas emissions are not cut drastically soon, he Swiss glaciers could cease to exist by 2100 – so says ETH Professor Daniel Farinotti in this ETH News interview #WorldDayOfGlaciers ethz.ch/en/news-and-...

To be clear: this would mean the *increment* of the increase in 2024 is itself the largest on record (in addition the value being the highest on record, which unfortunately happens essentially every year in our rapid warming era). That's...not great (as Glen discusses downthread).

Our new Nature Communications paper, led by Timo Kelder with coauthor Lisette Klok and an incredible team, explores how we can anticipate extreme weather before disaster strikes and build resilience to its impacts. 📽️ Watch this short video to learn more! 👇@naturecomms.bsky.social

Curious about climate patterns? The new ERA Explorer app lets you compare 85 years of climate data worldwide. Analyse climatological averages at any map point or explore month-by-month data.Dive deeper with ERA Explorer! era-explorer.climate.copernicus.eu?lat=50.86&ln... #C3S #beautifuldata

How Switzerland cleaned up its rivers and lakes. This success story is encouraging when we address the next step: improving river morphology and riparian vegetation in a warming world. www.theguardian.com/environment/...

Another fantastic product that came out of the 2024 US CLIVAR workshop on Confronting Earth System Model Trends with Observations: The good, the bad, the ugly. Check it out!

Can climate models reproduce observed trends? The answer can be challenging. Our new review paper in Science Advances led by Isla Simpson and Tiffany Shaw @drshaw.bsky.social discusses challenges and ways forward in confronting climate models and observations. www.science.org/doi/10.1126/...

1/ How to Stop Being Surprised by Unprecedented Weather Our new @naturecomms.bsky.social paper provides our multi-author perspective on methods to anticipate extreme weather and reduce impacts, shifting from reacting with surprise towards resilience. 🔗 Read it here: doi.org/10.1038/s414... 🧵⬇️