Martin Stendel
@martinstendel.bsky.social
Senior Researcher, Danish Meteorological Institute
Coordinator of PolarPortal (lots of up-to-date Arctic data) and ROPEWALK (huge Danish logbook digitization project)
Conveying science to the public.
Born @317 ppm.
Mastodon @[email protected]
Coordinator of PolarPortal (lots of up-to-date Arctic data) and ROPEWALK (huge Danish logbook digitization project)
Conveying science to the public.
Born @317 ppm.
Mastodon @[email protected]
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.
October 28, 2025 at 3:56 PM
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.
October 20, 2025 at 2:47 PM
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.
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.
September 23, 2025 at 11:37 AM
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.
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.
Mondfinsternis - Lunar eclipse - Måneformørkelse
September 7, 2025 at 7:18 PM
Mondfinsternis - Lunar eclipse - Måneformørkelse
Things were easier in 1954 when meteorologists still wore ties.
September 6, 2025 at 1:43 PM
Things were easier in 1954 when meteorologists still wore ties.
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.
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.
September 1, 2025 at 10:12 AM
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.
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.
August 11, 2025 at 8:15 AM
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.
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
@polarportal.bsky.social
July 25, 2025 at 7:58 PM
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
@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!
See more at @polarportal.bsky.social!
July 21, 2025 at 9:56 AM
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!
See more at @polarportal.bsky.social!
This will cost the GOP the midterm election. If there is an election.
July 4, 2025 at 1:43 PM
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!
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!
July 2, 2025 at 12:11 PM
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!
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?!
July 1, 2025 at 7:52 PM
As a German I ask: what is the difference between this and a concentration camp?!
Shouldn't have fired the NOAA people. But in everything, there's something good - he admitted having had a poor attendance.
June 17, 2025 at 4:40 PM
Shouldn't have fired the NOAA people. But in everything, there's something good - he admitted having had a poor attendance.
Never forget: today 8 years ago
May 31, 2025 at 9:33 AM
Never forget: today 8 years ago
Damn autopilot...
May 22, 2025 at 12:38 PM
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.
May 21, 2025 at 1:28 PM
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.
May 20, 2025 at 6:18 PM
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.
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.
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.
May 11, 2025 at 3:48 PM
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.
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.
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.
May 4, 2025 at 12:04 PM
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.
May 3, 2025 at 7:02 PM
Germany explaining democracy to the U.S. Eighty years after the end of the war.
Baseball-sized hail in Mangum, Oklahoma
April 29, 2025 at 2:23 PM
Baseball-sized hail in Mangum, Oklahoma
Today 2777 years ago: Rome is founded.
April 21, 2025 at 2:53 PM
Today 2777 years ago: Rome is founded.
Das mal in der Tagesschau zu lesen hätte ich nicht unbedingt erwartet.
April 9, 2025 at 11:04 AM
Das mal in der Tagesschau zu lesen hätte ich nicht unbedingt erwartet.
Die Linie der Vernunft
March 31, 2025 at 5:41 AM
Die Linie der Vernunft
Det ville være en god ide hvis kongen og statsministeren rejser til Grønland snart.
March 28, 2025 at 2:26 PM
Det ville være en god ide hvis kongen og statsministeren rejser til Grønland snart.