Hurricane Melissa, an extremely dangerous category 5 hurricane with a core pressure of 892 hPa (rank 3) and maximum sustained winds of 295 km/h (also rank 3) just before landfall on Jamaica's south coast. After crossing the island, it will also hit eastern Cuba. Note that one can see "down" the eye.

Not extremely convincing, but I managed to see comet Lemmon. All photos with my Samsung S22, night mode, three minutes exposure.

151 years and almost 9 months of daily maximum temperatures in Copenhagen, 1874-2025! Green line: daily average Light blue/orange: 10 and 90 percentiles Blue/red: absolute lowest and highest maximum Purple: values for 2025. Grey: all other years Warm mid-September exceeding the old record from 1947.

Trump just designated “Antifa” as a terrorist organization, on par with ISIS and Al Qaeda. As a reminder, “antifa” is short for “antifascist”. They will use this lie to surveil, imprison, and kill Americans on the left. This may be our Reichstag Fire moment. Wake up. www.cnn.com/2025/09/17/p...

Mondfinsternis - Lunar eclipse - Måneformørkelse

Things were easier in 1954 when meteorologists still wore ties.

Accumulated surface mass balance (SMB) 1 Sep 2024 to 31 Aug 2025 was 403.8 Gt (=km³), close to the average 1980-2025. SMB is snowfall - runoff, i.e. always positive. This is NOT the total mass balance TMB, which also includes iceberg calving and which shows ice loss for the 29th year in a row.

Components of the total mass balance TMB, hydr. years 1987-2025: SMB: surface mass balance (snowfall-runoff), MMB: marine mass balance (calving of icebergs), BMB: basal mass balance (friction). 2024/25: the 29th year in a row with negative TMB. Update of Mankoff et al. (2021), tinyurl.com/295khdnk.

As it is quite probable that at the end of the week it turns out that it is worth starting a war of aggression, I asked Gemini to give me a map of Europe showing Putin's next desires (i.e., all countries bordering either Russia or Belarus). I must say the result is pretty convincing.

Sehr cool. www.chronotrains.com/de/explore/2...

Melting over 80.6% of the area of the Greenland Ice Sheet. This is the highest value in our data set, which starts in 1981. @polarportal.bsky.social

Extreme Greenland melting event right now: thawing over 80% of the surface. Seen before only once in the record melt summer 2012. See more at @polarportal.bsky.social!

PLEASE NOTE: Data source for sea ice concentration and extent has changed. Beginning 1 July 2025, the Japanese AMSR2 is replacing the US SSMIS instrument for our sea ice concentration and extent products. SSMIS and AMSR2 differ by ±0.1 million km² or less with larger differences in summer.

If there is one graph showing the effect of human activities on the atmosphere, it is the Keeling curve, which shows the concentration of CO₂ since 1958. Mauna Loa Observatory captured the reality of climate change. The US plans to shut it down theconversation.com/mauna-loa-ob...

Lennart Bengtsson, former director of the ECMWF and the Max Planck Institute for Meteorology, the father of reanalyses and the ECHAM climate model and my boss from 1994 to 1998, has turned 90. mpimet.mpg.de/en/communica...

Flere vil dø på grund af vejrhændelser på grund af besparelser i vejrtjenesten: hurricane-sæson er lige begyndt. www.dr.dk/nyheder/udla...

More people to die soon?

This will cost the GOP the midterm election. If there is an election.

151½ years of daily maximum temperatures in Copenhagen, 1874-2025! Green line in the middle: daily average Light blue/orange: 10 and 90 percentiles Blue/red: absolute lowest and highest maximum Purple: values for 2025. Grey: all other years Note the "heat wave" 4 to 8 March, 10°C above the average!

As a German I ask: what is the difference between this and a concentration camp?!

𝐈𝐌𝐏𝐎𝐑𝐓𝐀𝐍𝐓 𝐍𝐎𝐓𝐄: The access to SSMIS data  from the US DMSP satellites is coming to an end. 𝐓𝐡𝐞 𝐚𝐜𝐜𝐞𝐬𝐬 𝐭𝐨 𝐝𝐚𝐭𝐚 𝐰𝐢𝐥𝐥 𝐞𝐧𝐝 𝐚𝐥𝐫𝐞𝐚𝐝𝐲 𝟑𝟎 𝐉𝐮𝐧𝐞 𝟐𝟎𝟐𝟓. We are working on the matter and try to find a replacement.

So far this week: ❌ SSMIS data halted (think sea ice, snow, hurricane, ice sheet monitoring, etc) ❌ climate[dot]gov removed and redirected to... ❌ NOAA Climate homepage, which was modified (e.g., removed Climate Stripes and Climate Ready Nation references) ❌ false bills to ex-probationary employees

This is very bad news. #Arctic #SeaIce @zacklabe.com @climatologist49.bsky.social

Ablation season in Greenland has begun, almost on date.

Shouldn't have fired the NOAA people. But in everything, there's something good - he admitted having had a poor attendance.

Jeg håber virkelig, at I ved, hvad I sætter i gang.

Progress in ROPEWALK, our large ship journal digitisation project! @adamjonk.bsky.social #esben_haubro_skov @dmidk.bsky.social #Rigsarkivet

Watch this. And listen.

It is not only the models, but also the observations behind them. As @michaelrlowry.bsky.social explains, these forecasts cost every US citizen $4 per year, but the profit (avoidance of losses) amounts to $320. We'll, it won't be Musk and consorts who'll die in one of the next hurricanes, I assume.

I cannot believe this is true. If at all possible, come and join us in Europe!

News from a "third world" country.

Never forget: today 8 years ago

“A developed country is not a place where the poor have cars. It's where the rich use public transportation.” – Former Bogotá Mayor Enrique Peñalosa.

Damn autopilot...

Next step in the ROPEWALK project: Quality control of the many ship voyages. A common problem is with position, both in the original (e.g., wrong octant near the prime meridian) and the transcribed data. Next, search for outliers etc. will be done. Example: M/S Uruguay, first quarter of 1952.

Unseasonally warm over eastern Greenland and Iceland. Egilsstaðaflugvöllur in eastern Iceland had a maximum temperature of 26°C, while a maximum of 14°C was observed in Ittoqqortoormiit in eastern Greenland. That is about 10°C warmer than the average temperature for the time of the year.

The onset of the melting season in Greenland is defined as the first of at least three days in a row with melting over more than 5% of the Greenland Ice Sheet. The median over the period 1981-2025 is on 26 May. This year, the melting onset was 12 days early, on 14 May, which is rank 11 of 45 years.

How long does it on average take between two total solar eclipses? 375 years, but they are not evenly distributed. Sumbe (Angola, 11.2°S, 13.9°E) had two within 18 months (21/6/2001 and 4/12/2002). The last total eclipse in Rome was on 3/6/1239. The next one will be on 3/9/2252, 1013 years later.

Within the next weeks, we will introduce a facelifted @polarportal.bsky.social (bye bye 90s design!) and also some new data! You always find data from @dmidk.bsky.social and our colleagues from #GEUS and @dtucryo.bsky.social there. Glad to say data is available on this side of the Atlantic.

Sex in Entenhausen: "Hat eine unbescholtene Verlobte ihrem Verlobten die Beiwohnung gestattet, so kann sie eine billige Entschädigung in Geld verlangen," wenn es nicht zur Heirat kommt. In Deutschland wurde das Kranzgeld (§1300 BGB) erst 1998 abgeschafft.

Germany explaining democracy to the U.S. Eighty years after the end of the war.

Baseball-sized hail in Mangum, Oklahoma

Today 2777 years ago: Rome is founded.

More in No, Other People: New poll: “America would be better off if more people worked in manufacturing.” • 80% of Americans agree • 20% disagree “I would be better off if I worked in a factory.” • 25% of Americans agree • 73% disagree • 2% currently work in a factory

@geraldstendel.bsky.social Willkommen

Das mal in der Tagesschau zu lesen hätte ich nicht unbedingt erwartet.

This funny 'American Pie' parody bites hard — from a comedy show that went out a few days ago in the UK

Last time with a GOP president and a GOP majority in Senate, House of Representatives and Supreme Court led to the stock market crash in 1929.

We take tariffs on our beautiful Heard Island very seriously. We will be consulting all mammals and flightless birds and will make an announcement in the near future detailing our response. #heardisland #tariff #mcdonaldisland #trumptariff

Die Linie der Vernunft