Frederik Kratzert
@kratzert.bsky.social
Research Scientist @ Google Research. Working on the intersection of machine learning and hydrology. Located in Vienna, Austria.
What do people do when their taxi driver is a) speeding like crazy and b) interacting with his phone all the time while driving. Not sure if I'm unlucky but this happens 4/5 times to me when taking the airport taxi back home...
November 20, 2025 at 10:27 PM
What do people do when their taxi driver is a) speeding like crazy and b) interacting with his phone all the time while driving. Not sure if I'm unlucky but this happens 4/5 times to me when taking the airport taxi back home...
It has been a while since the last news from Caravan but I'm happy to announce that a new extension has just been published.
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
[DATA CONTRIBUTION] CAMELS-CZ]: Catchment Attributes and Meteorology for Large-Sample Studies -- Czechia · Issue #49 · kratzert/Caravan
Basin prefix camelscz Zenodo DOI https://zenodo.org/records/17593968 Number of catchments 249 Location of catchments Czechia For which periods are streamflow records available in your dataset? 1950...
github.com
November 15, 2025 at 12:49 PM
It has been a while since the last news from Caravan but I'm happy to announce that a new extension has just been published.
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
The paper is finally published and we were able to keep the original title.
hess.copernicus.org/articles/29/...
hess.copernicus.org/articles/29/...
November 13, 2025 at 8:28 AM
The paper is finally published and we were able to keep the original title.
hess.copernicus.org/articles/29/...
hess.copernicus.org/articles/29/...
jax.config.update("jax_debug_nans", True) saved my day.
October 15, 2025 at 10:30 AM
jax.config.update("jax_debug_nans", True) saved my day.
Oh my god, I finally was able to fix it. After effectively not using my private laptop for the past 9 months (I have a corp laptop and a private desktop PC that runs Linux), I sat down and ask Gemini for help. I know, I know...
Thread for details.
Thread for details.
I made the mistake of updating my private laptop from ubuntu 22.04 to 24.04. Now everything is incredibly slow, no idea why. Reinstalled 22.04, same issue. Opening the terminal takes a couple of seconds, opening keepass takes 10s in the UI appears incrementally. #linux
September 27, 2025 at 8:56 PM
Oh my god, I finally was able to fix it. After effectively not using my private laptop for the past 9 months (I have a corp laptop and a private desktop PC that runs Linux), I sat down and ask Gemini for help. I know, I know...
Thread for details.
Thread for details.
This has easily been one of the most interesting external meetings in a while.
Looking forward to a full day of exciting talks at the GRIT workshop in Oxford.
🌐 Introducing GRIT: the First Global Bifurcating River Network 🏞
developed by Michel Wortmann as part of the NERC Large Grant EvoFLOOD, in the Hydro-Climate Extremes group @oxfordgeography.bsky.social
developed by Michel Wortmann as part of the NERC Large Grant EvoFLOOD, in the Hydro-Climate Extremes group @oxfordgeography.bsky.social
September 27, 2025 at 9:06 AM
This has easily been one of the most interesting external meetings in a while.
Reposted by Frederik Kratzert
i wrote about atproto and why it matters
Open Social — overreacted
The protocol is the API.
overreacted.io
September 26, 2025 at 3:33 PM
i wrote about atproto and why it matters
Reposted by Frederik Kratzert
Wow, ATProto (the tech that powers Bluesky) is pretty neat!
If, like me, you have not read about it but were curious, this is a great read explaining how it works:
overreacted.io/open-social/
If, like me, you have not read about it but were curious, this is a great read explaining how it works:
overreacted.io/open-social/
Open Social — overreacted
The protocol is the API.
overreacted.io
September 27, 2025 at 12:34 AM
Wow, ATProto (the tech that powers Bluesky) is pretty neat!
If, like me, you have not read about it but were curious, this is a great read explaining how it works:
overreacted.io/open-social/
If, like me, you have not read about it but were curious, this is a great read explaining how it works:
overreacted.io/open-social/
Looking forward to a full day of exciting talks at the GRIT workshop in Oxford.
🌐 Introducing GRIT: the First Global Bifurcating River Network 🏞
developed by Michel Wortmann as part of the NERC Large Grant EvoFLOOD, in the Hydro-Climate Extremes group @oxfordgeography.bsky.social
developed by Michel Wortmann as part of the NERC Large Grant EvoFLOOD, in the Hydro-Climate Extremes group @oxfordgeography.bsky.social
September 26, 2025 at 7:31 AM
Looking forward to a full day of exciting talks at the GRIT workshop in Oxford.
I just learned that the recording of my invited plenary keynote talk at #EMS25 last week in Ljubljana, Slovenia is publicly available.
Here is the link in case anyone wants to watch it: vimeo.com/1118021056?f...
Here is the link in case anyone wants to watch it: vimeo.com/1118021056?f...
Flood warnings everywhere - data-driven rainfall-runoff modeling at global scale - Frederik Kratzert - UPK
This talk was given at the EMS Annual Meeting 2025 in Ljubljana during the Session UPK - Keynote Presentation Understanding Weather & Climate Processes. Title:…
vimeo.com
September 19, 2025 at 2:21 PM
I just learned that the recording of my invited plenary keynote talk at #EMS25 last week in Ljubljana, Slovenia is publicly available.
Here is the link in case anyone wants to watch it: vimeo.com/1118021056?f...
Here is the link in case anyone wants to watch it: vimeo.com/1118021056?f...
After about one year in review, the dataset paper for the Caravan-GRDC extension was finally published.
See: essd.copernicus.org/articles/17/...
I am so happy that GRDC was open for this effort and made some of their data freely available through Caravan.
See: essd.copernicus.org/articles/17/...
I am so happy that GRDC was open for this effort and made some of their data freely available through Caravan.
GRDC-Caravan: extending Caravan with data from the Global Runoff Data Centre
Abstract. Large-sample datasets are essential in hydrological science to support modelling studies and advance process understanding. Here, we present the GRDC-Caravan dataset, an extension to the lar...
essd.copernicus.org
September 19, 2025 at 9:56 AM
After about one year in review, the dataset paper for the Caravan-GRDC extension was finally published.
See: essd.copernicus.org/articles/17/...
I am so happy that GRDC was open for this effort and made some of their data freely available through Caravan.
See: essd.copernicus.org/articles/17/...
I am so happy that GRDC was open for this effort and made some of their data freely available through Caravan.
Reposted by Frederik Kratzert
I got tired of mashing together tools to write long threads with 𝐫𝐢𝐜𝐡 𝑓𝑜𝑟𝑚𝑎𝑡𝑡𝑖𝑛𝑔 and ℳα†ℏ—so I wrote La𝑇𝑤𝑒𝑒𝑡!
It converts Markdown and LaTeX to Unicode that can be used in “tweets”, and automatically splits long threads. Try it out!
keenancrane.github.io/LaTweet/
It converts Markdown and LaTeX to Unicode that can be used in “tweets”, and automatically splits long threads. Try it out!
keenancrane.github.io/LaTweet/
September 11, 2025 at 1:28 PM
I got tired of mashing together tools to write long threads with 𝐫𝐢𝐜𝐡 𝑓𝑜𝑟𝑚𝑎𝑡𝑡𝑖𝑛𝑔 and ℳα†ℏ—so I wrote La𝑇𝑤𝑒𝑒𝑡!
It converts Markdown and LaTeX to Unicode that can be used in “tweets”, and automatically splits long threads. Try it out!
keenancrane.github.io/LaTweet/
It converts Markdown and LaTeX to Unicode that can be used in “tweets”, and automatically splits long threads. Try it out!
keenancrane.github.io/LaTweet/
A packed room full of young and motivated scientists, today at my presentation at the @ellis.eu #SummerSchool2025. It was a real pleasure being there.
Now I'm on my way back to Vienna but not without the by-now normal delay of 1h+ with the @bahn.de...
Now I'm on my way back to Vienna but not without the by-now normal delay of 1h+ with the @bahn.de...
🎤 Keynotes on Day 3 at @ellis.eu #SummerSchool2025 in Jena
3️⃣ Marc Rußwurm — Learning Robust Environmental Embeddings by Training AI to Play Satellite GeoGuessr 🛰️🕹️
4️⃣ Frederik Kratzert — Deep Learning for Large-Scale Rainfall-Runoff Modeling & Flood Forecasting 🌧️🌊
🔗 www.ellis-jena.eu/summer-schoo...
3️⃣ Marc Rußwurm — Learning Robust Environmental Embeddings by Training AI to Play Satellite GeoGuessr 🛰️🕹️
4️⃣ Frederik Kratzert — Deep Learning for Large-Scale Rainfall-Runoff Modeling & Flood Forecasting 🌧️🌊
🔗 www.ellis-jena.eu/summer-schoo...
September 3, 2025 at 5:41 PM
A packed room full of young and motivated scientists, today at my presentation at the @ellis.eu #SummerSchool2025. It was a real pleasure being there.
Now I'm on my way back to Vienna but not without the by-now normal delay of 1h+ with the @bahn.de...
Now I'm on my way back to Vienna but not without the by-now normal delay of 1h+ with the @bahn.de...
Never managed to attend a summer school during my master or PhD program. But it is never too late =)
Arrived in Jena to attend "ELLIS Summer School: AI for Earth and Climate Sciences" and to give a talk later this week.
Looking forward to many exciting conversations with young scientists
Arrived in Jena to attend "ELLIS Summer School: AI for Earth and Climate Sciences" and to give a talk later this week.
Looking forward to many exciting conversations with young scientists
August 31, 2025 at 8:32 PM
Never managed to attend a summer school during my master or PhD program. But it is never too late =)
Arrived in Jena to attend "ELLIS Summer School: AI for Earth and Climate Sciences" and to give a talk later this week.
Looking forward to many exciting conversations with young scientists
Arrived in Jena to attend "ELLIS Summer School: AI for Earth and Climate Sciences" and to give a talk later this week.
Looking forward to many exciting conversations with young scientists
@simonwillison.net have you seen that?
August 21, 2025 at 3:00 PM
@simonwillison.net have you seen that?
Reposted by Frederik Kratzert
Happy to share that if you are interested in large sample hydrology datasets and specifically water quality data you can now check our now officially published dataset:
doi.org/10.1038/s415...
doi.org/10.1038/s415...
Swiss data quality: augmenting CAMELS-CH with isotopes, water quality, agricultural and atmospheric data - Scientific Data
Scientific Data - Swiss data quality: augmenting CAMELS-CH with isotopes, water quality, agricultural and atmospheric data
doi.org
July 25, 2025 at 9:32 AM
Happy to share that if you are interested in large sample hydrology datasets and specifically water quality data you can now check our now officially published dataset:
doi.org/10.1038/s415...
doi.org/10.1038/s415...
Reposted by Frederik Kratzert
@leaflet.pub is such an innovative platform
If you select some text (1), a tooltip appears that allows you to share the selection as a quote on Bluesky (2)
If you click the Quotes icon (3), a panel showing all quotes appears (4)
It's a terrific integration between blogging and microblogging
If you select some text (1), a tooltip appears that allows you to share the selection as a quote on Bluesky (2)
If you click the Quotes icon (3), a panel showing all quotes appears (4)
It's a terrific integration between blogging and microblogging
July 26, 2025 at 12:11 PM
@leaflet.pub is such an innovative platform
If you select some text (1), a tooltip appears that allows you to share the selection as a quote on Bluesky (2)
If you click the Quotes icon (3), a panel showing all quotes appears (4)
It's a terrific integration between blogging and microblogging
If you select some text (1), a tooltip appears that allows you to share the selection as a quote on Bluesky (2)
If you click the Quotes icon (3), a panel showing all quotes appears (4)
It's a terrific integration between blogging and microblogging
Oh, I didn't know. That is indeed pretty neat.
I've been waiting a few years for this: Zarr v2 support was just launched in Google Earth Engine! Check out this demo that loads ARCO-ERA5 into GEE 🔥
code.earthengine.google.com/67ac1e48848d...
developers.google.com/earth-engine...
code.earthengine.google.com/67ac1e48848d...
developers.google.com/earth-engine...
June 27, 2025 at 7:52 PM
Oh, I didn't know. That is indeed pretty neat.
Das kann doch kein zufall sein @geschichte.fm ?!
Imagine more than 30,000 people living in a space the size of a few city blocks without central planning, zoning, or formal governance 🏙 This was Kowloon Walled City, an urban enclave in Hong Kong known for its stacked, improvised architecture and intensely lived-in spaces. 🧵⬇️ (1/4)
June 26, 2025 at 8:43 PM
Das kann doch kein zufall sein @geschichte.fm ?!
We are in the year 2025 and people write a paper showing that a model trained with ‼️global, coarse resolution forcings‼️ performs worse in ‼️ungauged‼️ basins, than a regional model trained with ‼️local, high resolution forcings‼️ in ‼️gauged‼️ basins.
This is used to say "training on more basins is bad"🤯
This is used to say "training on more basins is bad"🤯
June 24, 2025 at 12:26 PM
We are in the year 2025 and people write a paper showing that a model trained with ‼️global, coarse resolution forcings‼️ performs worse in ‼️ungauged‼️ basins, than a regional model trained with ‼️local, high resolution forcings‼️ in ‼️gauged‼️ basins.
This is used to say "training on more basins is bad"🤯
This is used to say "training on more basins is bad"🤯
You know this feeling, when you get to review a paper for the n-th amount of time (always resubmissions to different journals after rejections), with the authors not adapting any of the comments and keeping all the obvious non-sense?
Nobody ever should see my first draft of review comments.....
Nobody ever should see my first draft of review comments.....
June 24, 2025 at 11:59 AM
You know this feeling, when you get to review a paper for the n-th amount of time (always resubmissions to different journals after rejections), with the authors not adapting any of the comments and keeping all the obvious non-sense?
Nobody ever should see my first draft of review comments.....
Nobody ever should see my first draft of review comments.....
Reposted by Frederik Kratzert
Interesting take: www.dlib.org/dlib/october...
Why computer modeling should become a popular hobby
www.dlib.org
June 14, 2025 at 7:21 AM
Interesting take: www.dlib.org/dlib/october...
I wish my universities would have offered such classes. Sounds amazing
"Always give students freedom to add a personal touch to an assignment"
This is a chip a first year student designed for my "Design Engineering for physics students" course @tudelfttnw.bsky.social. and if you look carefully you can find their personal nerdy touches on it :-). 🧵👇
This is a chip a first year student designed for my "Design Engineering for physics students" course @tudelfttnw.bsky.social. and if you look carefully you can find their personal nerdy touches on it :-). 🧵👇
June 5, 2025 at 9:30 PM
I wish my universities would have offered such classes. Sounds amazing
@gauchm.bsky.social and @danklotz.bsky.social you are not alone
Oof. I feel this. I've always loved—and heavily used—the em-dash.
In addition to its versatility, it breaks up the density of a paragraph—letting in air that an abundance of commas, semi-colons, and parentheses just don't.
In addition to its versatility, it breaks up the density of a paragraph—letting in air that an abundance of commas, semi-colons, and parentheses just don't.
Some people think AI writing has a tell — the em dash. Writers disagree.
Em dashes have been derided as the “ChatGPT hyphen” — a punctuation mark overused by artificial intelligence. That’s not quite true.
www.washingtonpost.com
June 2, 2025 at 11:15 AM
@gauchm.bsky.social and @danklotz.bsky.social you are not alone
Trying to install Ruby and RVM on Linux for 15 minutes and wondering if there is really something more complicated than setting up Python.
June 1, 2025 at 7:38 PM
Trying to install Ruby and RVM on Linux for 15 minutes and wondering if there is really something more complicated than setting up Python.