KarSteN Haustein
LightNews LightNews
banner
khaustein.bsky.social
KarSteN Haustein
@khaustein.bsky.social
2.1K followers 1K following 370 posts
Human | Climate Scientist | Meteorologist | Stormchaser | Queer
@unileipzig | ex-@ecioxford | @S4F | YIMBY | he/him 🏳️‍🌈🏳️‍⚧️🦄 💕

#bekind #diversity #equality #empathy #inclusivity #fightfascism
#WakeTheFuckUp!! #TeamJoyResistance

https://thueringen-weltoffen.de
Posts Replies Media Videos
khaustein.bsky.social
Early fall all across Europe, Russia and Mongolia. Super-early variant of Warm Arctic Cold Continent pattern (WACCy). Late heat in parts of North America.

www.karstenhaustein.com/climate
Map of the globe with red and blue shades for warm and cold temperature departures from the mean. Dark red hot spot in Canada. EU, Russia and Mongolia in blue.
September 27, 2025 at 8:42 PM
khaustein.bsky.social
Fabulous human-centred transformation of a shitty car sewer into a green, walkable and mobility friendly urban space. 😍😍

That’s how you design a future-proof City.

#Hamburg #Mobility4all
Street scene with lawn and bike path Street scene with trees and bike path
September 26, 2025 at 4:32 PM
khaustein.bsky.social
ExtremWetterKongress und KlimaManagementTagung in Hamburg. Many ideas. Many perspectives. Controversy and agreement on a range of topics such as this: Climate communication needs to be readjusted.

#ClimateCrisis #ClimateJustice
Panelists’ in Front of a blue screen
September 25, 2025 at 5:39 PM
khaustein.bsky.social
We are living through the 2nd warmest September in modern human history. High time to feistily fight the fascist overlords and tell them what people really want! #ClimateAction #FightAuthoritarianism #fckTrump #TeamJoyResistance
Global map temperature departures from the man (1981-2010). Red and blue for warm and cold anomalies during September 2025. Basically all but the central Pacific ENSO region in red.
September 22, 2025 at 11:33 PM
khaustein.bsky.social
Heute Abend an der @uni-jena.de falls jmd spontan Zeit und Lust hat 🫠

www.eventbrite.de/e/sind-die-k...
Textinfo zum Vortrag heute Abend.
September 16, 2025 at 9:58 AM
khaustein.bsky.social
If you happen to be in Leipzig this coming Saturday, here is sth you might enjoy. Fine weather (thx to climate change 😋) and inspiring conversations /w awesome people. Do come along if you feel like it 🤗

12pm for insights into the climate and leadership crisis:
leipzigfuersklima.de/klimafair-20...
Green advert for this years 'KlimaFair' on 30 August in Leipzig. Karsten Haustein will be talking about the climate crisis and how it is closely linked to the current leadership crisis in most western democracies. Starting 12pm at the central market square.
August 27, 2025 at 10:50 PM
khaustein.bsky.social
He does, but it's perfectly compatible with what i said. Just for the sake of completeness the Z500 trend over the 2003-2019 interval attached. Less cloudy East Pacific owing to weaker Aleutian Low. All of that is also compatible with the global increase in ASR which i never disputed ;)
August 26, 2025 at 3:22 PM
khaustein.bsky.social
Loeb is referring to the global trend. That's a different story! I'm talking about your snapshot region in the North Pacific. Here is the Z500 comparison between 2024-2020 and 2010-2019. Hugh high pressure dominance, which is basically the atmospheric driver of PDV neg. Of course you absorb more SR.
August 26, 2025 at 2:02 PM
khaustein.bsky.social
In this context, it can't be stressed enough how essentially useless summer seasonal predictions for Europe really are. Below the ensemble mean for July initialised in May and June.

climate.copernicus.eu/charts/packa...

Actual July mean for comparison:

www.karstenhaustein.com/reanalysis/g...
Map of Europe with red and blue colours for warm/cold temperature departures from the mean as forecast by seasonal prediction models for July (initialised in May). Red across all of Europe. Map of Europe with red and blue colours for warm/cold temperature departures from the mean as forecast by seasonal prediction models for July (initialised in June). Red across all of Europe.
July 28, 2025 at 10:03 AM
khaustein.bsky.social
From hottest to coldest within a span of a month. Month-end June vs month-end July. Wyld swing across Europe. Certainly both extreme events in its own right. Happy autumn everyone in western Europe 🥶 Brace for more heat especially in Türkiye 🔥

www.karstenhaustein.com/climate
Map of Europe with red and blue colours for warm/cold temperature departures from the mean (1981-2010) at the end of June/beginning of July. Western Europe red-hot, Eastern Europe blue-cool. Map of Europe with red and blue colours for warm/cold temperature departures from the mean (1981-2010) at the end of July/beginning of August. Western Europe blue-cool, Eastern Europe red-hot.
July 28, 2025 at 10:03 AM
khaustein.bsky.social
That's true even tho southwestern and central Europe is currently being treated with the coldest possible scenario (ironically during peak summer when heat records are most likely).

Map shows departure from 1981-2010 mean for the next 7 days (based on GFS forecast)

www.karstenhaustein.com/climate
map with red and blue colours across Europe showing temperature departures from the long-term average (1981-2010) for the coming week
July 25, 2025 at 12:19 PM
khaustein.bsky.social
With two months of summer in the books, it turns out that predicting a 'hot summer' for a specific region remains garbage. Beyond the entirely predictable climate change signal, all we get is weather. And yeah, even in the absence of sunshine, summer is still much hotter than it used to be (1/2)
map with red and blue colours across Europe showing temperature departures in June 2025 from the long-term average (1981-2010) map with red and blue colours across Europe showing temperature departures in July 2025 from the long-term average (1981-2010)
July 25, 2025 at 12:19 PM
khaustein.bsky.social
Not gonna lie, as much as considerably below-normal temperatures during peak heat season are a relieve, it does not help climate policy. We need to feel pain and suffering before we act. The weather of the coming weeks isn't gonna help in that regard (referring big players such as FRA, GER, ESP etc)
map of europe with red and blue colours depicting warm and cold temperature anomalies over the coming week across the continent
July 23, 2025 at 11:06 PM
khaustein.bsky.social
Probably the 3rd warmest June has just ended. Notably cooler especially in the Northern Hemisphere compared to last year tho. Neutral ENSO is eventually doing its thing.

www.karstenhaustein.com/climate
Map of the globe (Robinson projection) with temperature departure from the long-term mean in red and blue (warm and cold). Relatively cool tropical oceans, hot spots over the Mediterranean, Europe and parts of Central Asia.
July 1, 2025 at 12:22 AM
khaustein.bsky.social
In other news, May will likely end up 2nd warmest (2024 remaining at the top spot). Eastern Europe, the Indian subcontinent and to a lesser degree the US tornado alley will end up below average (relative to 1981-2010) in the usual sea of warm anomalies #ClimateCrisis
World map with red and blue colours for warm and cold temperature departures from the long-term mean. Warmer than normal in the Arctic and many parts of Central Asia. Colder than normal in Eastern Europe and the Indian subcontinent.
May 28, 2025 at 10:01 AM
khaustein.bsky.social
Huge crowd at the last great debate of #EGU25:

"How should the global geoscience community respond to attacks on science?"

meetingorganizer.copernicus.org/EGU25/sessio...

The science community is desperate to find ways how to combat the onslaught on academic institutions and research.
May 2, 2025 at 3:10 PM
khaustein.bsky.social
It's this time of the year again where everyone is gathering in Vienna #EGU25

If you wanna hear more about academic activism, here is a neat overview. Also, come to our short course at 7pm tonight:

meetingorganizer.copernicus.org/EGU25/sessio...
April 28, 2025 at 9:49 AM
khaustein.bsky.social
Driest Spring period (Feb to now) in Germany in the observational record (which started in 1931) #ClimateCrisis

www.dwd.de/DE/presse/pr...
Map of Germany with brown colours for dry regions (almost all of it) and green for wetter regions (none).
April 15, 2025 at 12:35 PM
khaustein.bsky.social
Rest assured, spring has already sprung in Germany ☀️🌸🌼 … question is, how long an we continue without rain 🏜️
April 13, 2025 at 12:06 AM
khaustein.bsky.social
Spring is ramping up its game (ie intensity) over most of Europe in the coming week. Enjoy it ... i guess 🤪
Map of Europe with red and blue colour for warm and cold temperature deviations relative to the long term climatological mean for the next 7 days. The hottest anomalies are centred over Poland, but it's gonna be warmer everywhere except Ireland, Iceland, Portugal and Turkey.
April 13, 2025 at 12:02 AM
khaustein.bsky.social
things flip, if I switch to June 2000-2020 (ERA5 relative to Berkeley, HadCRUT5, NCEP1). All 3 now with a warm bias over the Baltic Sea and Norway (cold bias in the earlier period). Note that anomalies in NCEP1 during the latter period r heavily exaggerated. I reckon it's just legacy by now (2/3)
April 7, 2025 at 10:43 PM
khaustein.bsky.social
there is a bit of a tendency in May as well, so it's not June per se. I've plotted ERA5 relative to Berkeley, HadCRUT5 and NCEP1 reanalysis for June 1950-1970 (during which @edhawkins.org found a cold bias relative to 20CRv3 over the Baltic Sea. All 3 show a similar pattern in Scandinavia (1/2)
April 7, 2025 at 10:43 PM
khaustein.bsky.social
I've quickly plotted ERA5 and Berkeley for May and June (1950-2020 linear trend). Also April, July and August (not shown). It's really only June that does odd things. Less obvious in Berkeley (resolution problem), but arguably similar. 1975-2024 trend much less weird. Weird weather anomalies?
April 7, 2025 at 1:25 PM
khaustein.bsky.social
Übrigens kein Aprilscherz: 'Um 2,5 Grad Celsius
ist die Temperatur in Deutschland bereits gestiegen'

www.zeit.de/2025/14/klim...

Der @dwdderwetterdienst.bsky.social stellt offiziell auf die physikalisch korrekte nicht-lineare Trendberechnung um.

Mehr auch gleich hier: www.dwd.de/klimatrends
red and dotted line overlaid on blue and orange points which represent annual mean temperature deviations from the mean.
April 1, 2025 at 9:39 AM
khaustein.bsky.social
Last day of the month. March 2025 was probably the 3rd warmest on record. Many shades of red (relative to 1981-2010), with a few blue patches here and there 🇨🇦

www.karstenhaustein.com/climate
Image of the globe with red (warm) and blue (cold) colours to illustrate the temperature deviations from the long-term mean.
March 31, 2025 at 11:11 AM