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<b><i>"Exascale Numerical Weather Prediction at ECMWF"</i></b></div>
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<b>Samuel Hatfield</b></div>
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Computational Scientist,</div>
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European Centre for Medium-Range Weather Forecasts (ECMWF)</div>
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Please feel free to forward/share this invitation with other groups/disciplines that might be interested in this talk/topic. All are welcome to attend. </div>
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NOTE: In-person attendance is requested in our 499 Dirac Science Library (DSL) Seminar Room. Zoom access is intended for external (non-departmental) participants only. </div>
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<b>https://fsu.zoom.us/j/94273595552 </b></div>
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Meeting # <b>942 7359 5552 </b></div>
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🎦 Colloquium recordings will be made available here, <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sc.fsu.edu%2Fcolloquium&data=05%7C02%7Csc-seminar-announce%40lists.fsu.edu%7C3df3adeadb3144a3c8cd08de12385b65%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638968230404839321%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=awEwnc3Qfb9zYTeu60bt6WO6zLKLVFMT3D881NfRxBY%3D&reserved=0" originalsrc="https://www.sc.fsu.edu/colloquium">
https://www.sc.fsu.edu/colloquium</a> </div>
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<b>Wednesday, Oct 29, 2025, Schedule: </b></div>
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* 3:00 to 3:30 PM Eastern Time (US and Canada) </div>
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☕ Nespresso & Teatime - 417 DSL Commons </div>
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<b>* 3:30 to 4:30 PM Eastern Time (US and Canada) </b></div>
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<b>🕟 Colloquium - 499 DSL Seminar Room </b></div>
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<b>Abstract: </b></div>
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For many decades now, the European Centre for Medium-Range Weather Forecasts (ECMWF) has spearheaded developments in global numerical weather prediction. The continued growth in forecast skill over the past few decades is due in large part to increases in the
grid resolution of ECMWF's Earth-system model, the Integrated Forecasting System (IFS). This increase has gone hand-in-hand with developments in high-performance computing, with new generations of supercomputer permitting higher model resolutions and complexity.
A step change in the fidelity of global atmospheric simulations is expected as the model resolution approaches this "kilometre scale", in particular for the representation of extreme weather events.</div>
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However, recent developments in supercomputing present a barrier as we push towards these kilometre-scale simulations. The impetus for this new class of forecast system comes from the Destination Earth project, whose goals are to develop a series of Earth-system
digital twins to aid in the prediction and mitigation of extreme weather events under a changing climate. In order to run this new class of Earth-system simulation efficiently, one must make effective use of accelerators, namely GPUs.</div>
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This talk will give an overview of activities at ECMWF towards the goal of running kilometre-scale Earth-system simulations on pre-exascale and exascale supercomputers. I will concentrate in particular on the spectral transform library ecTrans and the physical
parametrization package of the IFS. I will also explore the opportunities of the new breed of data-driven models, which are led by ECMWF's AIFS machine learning model. These models rival traditional "physics-based" models such as the IFS, and are extremely
cheap at inference time. The training of these models is a high-performance computing problem in its own right.</div>
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Additional colloquium details can be found here, </div>
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<a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sc.fsu.edu%2Fnews-and-events%2Fcolloquium%2F1887-colloquium-with-samuel-hatfield-2025-10-29&data=05%7C02%7Csc-seminar-announce%40lists.fsu.edu%7C3df3adeadb3144a3c8cd08de12385b65%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638968230404858551%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=FpBKntIo2L%2BPfXhvjHYVdYkeXeltJBfanbyzRzc1h5A%3D&reserved=0" originalsrc="https://www.sc.fsu.edu/news-and-events/colloquium/1887-colloquium-with-samuel-hatfield-2025-10-29">https://www.sc.fsu.edu/news-and-events/colloquium/1887-colloquium-with-samuel-hatfield-2025-10-29</a></div>
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