Warm Arctic, cold continents, www.euronews.com/green/2026/0...

A tale of two press releases. One says the jet stream is slowing down, the other says it is speeding up. How can they both be right? In fact, as I explained in this talk at the Andorra Weather Meeting, there is no contradiction. The jet stream is changing in different ways at different altitudes.

In JGR: Atmospheres, scientists present the GOES Eastern U.S. Fire Emissions (GEUFE, pronounced “goofy”) inventory, which improves fire detection using frequent observations from the GOES-16 satellite.🛰️ 🔗 Check out the #OpenAccess article: buff.ly/muRiMkS #AGUPubs #Wildfire #ClimateChange

🧵 You’re invited! Join the 9th CAMS Policy User Workshop in Budapest on 4–5 March 2026 hosted by HungaroMet and organised with the 2026 FAIRMODE plenary.

How climate breakdown is putting the world’s food in peril - in maps and charts www.theguardian.com/environment/...

An update of the Global Hydrogen Budget. The biggest source of H2 into the atmosphere is oxidation of CH4 and NMVOCs. So if you care about the climate effects of H2, reduce your CH4 emissions... www.nature.com/articles/s41... 1/

A cold spell in Europe until the end of the year. The episode is not likely to grow in strength and duration. Weather in Scandinavia seems to remain quite mild this month. Sustained cold weather in central Europe would need a very cold region from where cold air could be advected.

I have a new update to climate model-observation comparisons over at The Climate Brink, covering CMIP3, CMIP5, and CMIP6. Models perform well globally. The latest generation shows too much long-term warming but better reproduces recent trends: www.theclimatebrink....

This is a legitimate scientific revolution in meteorology. Also, to be clear, these models are not the AI LLMs that most people are familiar with. They are machine learning algorithms trained on observations (actually reanalysis).

UK ‘not in favor’ of dimming the sun https://www.politico.eu/article/uk-not-in-favor-of-dimming-the-sun-but-willing-to-debate-regulation/ Government says it opposes the cutting-edge and controversial climate tech, but is willing to debate its regulation. We don't need "regulation", just an out […]

Latest ECMWF forecast of the zonal mean zonal wind at the 10 hPa level, picking up in strength, and reestablishing to normal polar vortex wind speeds within the coming week

Incredible footage of volcanic eruption of a dormant volcano in Ethiopia from a commercial plane. A sight seen for the first time in recorded history. ⌚

Contrails act like short-lived climate forcers. Here was the 1-2% estimate recently (re-)stated: www.rff.org/publications...

Najnowszy wpis na blogu o pionierskim zdobyciu przez Tomasza wulkanu tarczowego #HayliGubbi #Afar #Etiopia #Afryka/ Various photos of #HayliGubbi #volcano in #Afar #Ethiopia Link: wulkanyswiata.blogspot.com/2025/03/hayl...

#ETHIOPIA: Hayli Gubbi is the southern most #volcano of the Erta Ale Range erupts today violently after 10,000years…..it is the northern end of the Great Rift Valley. 1/2 #HayliGubbi

An eruption from the #HayliGubbi volcano in #Ethiopia resulted in a large ash cloud, visible here from space. 🌋 This impressive view was seen 36,000km above Earth by our Meteosat-12 satellite on 23 November at 13:40 UTC.

1️⃣ Der #Vulkan #HayliGubbi ist nach Tausenden von Jahren in der Afar-Region, #Äthiopien, ausgebrochen⤵️

Sentinel-5P #TROPOMI measurements at ~11:00 UTC show most of the SO₂ emissions from #HayliGubbi spreading east in the upper troposphere. Plume contains ~44 kilotons of SO₂ (~0.04 Tg).

An explosive #eruption of Hayli Gubbi #volcano, located SE of Erta'Ale in the Afar Rift (Ethiopia), began at ~08:30 UTC on Nov 23. Eruption onset was fortuitously captured by a @planet.com overpass at 08:31 UTC. Hayli Gubbi has no record of Holocene eruptions. Toulouse VAAC reporting ash to ~15 km.

Búzios Scientific Statement 100 climate researchers, coordinated by @pik-potsdam.bsky.social & @iiasa.ac.at, released a joint statement to inform the #COP30 negotiations and provide guidance on difficult but doable global efforts designed to limit dangerous overshoot of 1.5°C as much as possible.

Sterke en snelle vermindering van broeikasgas-uitstoot is nodig om de zeespiegelerfenis te beperken www.nioz.nl/en/news/deep...

The Vietnamese Bach Ma Mountain Peak station recorded one-day rainfall of 1,739 mm - close to the global one-day record and perhaps a new record for the northern hemisphere. It is part of a deluge Viet Nam has seen in October, shattering 35 precip records. e.vnexpress.net/news/news/en...

Great dissection of where the world stands on climate 10 years after Paris: better than ever; worse than needed. Start here: www.nytimes.com/interactive/... But lemme quibble a bit with the CO₂ₑ emissions pathways painted here. A quick 🧵

I was recently invited to present my thoughts on the role of universities in the #climate crisis Several audience members asked that I share my slides, so I've decided to post them here too as an open resource I'd love any feedback, & for you to share examples of projects & best practice. Long 🧵😊

See also this inititative www.solargeoeng.org/non-use-agre... though without the dual-use permanent satellite-based monitoring element to detect any unwanted experimenting together with early warning for volcanic ash plumes in UTLS

Non-use agreement similar to the present-dat nuclear test-ban treaty, together with new Europe/Asia led dual-use satellite-based monitoring (non-use and also for aviation warning systems on volcanic ash) could be a practical way forward for the next decade, in my view. Finding out how to get there.

reminder... activistchecklist.org/links/

Tien jaar na het Klimaatakkoord van Parijs is duidelijk dat de aarde nog steeds opwarmt. Hittegolven zijn warmer en komen vaker voor, en het aantal warme dagen neemt wereldwijd toe.

In this piece @carbonbrief.org still reports the warming by methane based on its increase in abundance (~25% of warming, and not the more correct much larger share in the emission-based methane forcing. Source: IPCC AR6. Do not forget #troposphericozone and other chemistry

‘Stratospheric aerosol injection (SAI) could change the sky’s appearance. This could play a role in shaping public perception of SAI.’

Explainer: Will global warming ‘stop’ as soon as net-zero emissions are reached? | @hausfath.bsky.social #CBarchive Read:

It is a thought proviking idea, using methane-consuming microbes to combat methane release at the source location (eg waste water, landfill, coal mines). What could be demonstrated already in this respect?

The Dutch offshore wind programme is in trouble. While 4.5 GW is in operation and another 1.5 GW under construction, the plan was to rapidly build out capacity to 21 GW by 2032. That is now out of reach. My thoughts on how this happened, and what to do about it! www.commonfutures.com/en/insights/...

Emerging hemispheric asymmetry of Earth’s radiation | PNAS www.pnas.org/doi/10.1073/...

‘Circular cirrus’ (contrails caused by circling aircraft) over The Netherlands observed with MTG

The centers of Hurricanes #Humberto and #Imelda are now just 480 miles apart, and they share a larger envelope of circulation. What a spectacular example of binary vortex interaction!

Noting guru Eun-Pa Lim explains on X that its still very early days for the Sudden Stratospheric Warming, and what we have seen so far is a 'minor warming'

Busy days around what might become to be known as the 2025 Sudden Stratospheric Warming: Loads of media interest, and thanks to the journalists who take their time to talk to me before writing their story. Happy to take some of mine in turn. theconversation.com/air-temperat...

De ozonlaag vertoont tekenen van herstel dankzij internationale samenwerking en wetenschappelijk onderbouwd beleid. Monitoring blijft nodig omdat natuurverschijnselen onverwacht invloed kunnen hebben.

Het KNMI heeft onhoorbaar laagfrequent geluid (infrageluid) geregistreerd van de inslag van asteroïde 2023 CX1, die op 13 februari 2023 boven Normandië in Frankrijk uiteenviel. De ruimterots was ongeveer één meter groot en werd slechts enkele uren voor de inslag ontdekt.

From daily tracking of the Antarctic ozone hole to open-access data, CAMS helps protect the ozone layer, safeguarding people and planet. On the #WorldOzoneDay, we highlight CAMS’ role in global efforts towards ozone recovery. Read the article for insights 🔗 atmosphere.copernicus.eu/preserving-o...

Read more: atmosphere.copernicus.eu/preserving-o...

This year, the ozone hole presented an early development, reaching a larger-than-average area mid-September. On #WorldOzoneDay, #CopernicusAtmosphere continues to provide tools for everyone to monitor the health of our planet.

In 1985, the Vienna Convention set the stage for fixing the ozone hole. It showed the power of countries coming together around science. A model we still need today. #WorldOzoneDay #MontrealProtocol #GlobalAction

‘Proxy retrievals are robust in horizontally heterogeneous conditions, including cloud-dominated tropics and variable surface albedo.’ doi.org/10.1029/2024...

Note: Global greenhouse gas emission monitoring is not dependent on one state (eg US) or one actor not providing new data (eg EPA). The global carbon budget can be monitored using top-down inversions providing observation-based country emission estimates essd.copernicus.org/articles/17/...

Shares of power production by source, world

Emerging signs of diverging global and US trends for wind energy production and EV sales. Even if US would stop its green investments, the rest of the world continues to decarbonize rapidly, reducing future climate warming.

Climate Experts’ Review of the DOE Climate Working Group Report. Dessler et al., 2025