dClimate/aifs-single-earthboi

AIFS Single 1.1 on earthboi

ECMWF's AIFS Single 1.1, run by the earthboi platform from its published ERA5 initial conditions and scored against station observations.

This repo holds no weights. earthboi.yaml declares ECMWF's repo, which the platform mounts read-only at /weights, pinned to the commit main pointed to when this wrapper was registered. predict.py:

1. reads the 13 pressure levels, 12 surface fields and 4 constants AIFS was trained on from the initial conditions, at T-6h and T0;
2. interpolates them bilinearly from the regular 0.25 degree grid onto the checkpoint's N320 reduced Gaussian grid;
3. runs the forecast with anemoi-inference to +168h;
4. interpolates 2 m temperature back onto the 0.25 degree grid for scoring.

Not what ECMWF runs operationally: that has been AIFS Single 2.0 since 12 May 2026, so this wrapper's scores are not expected to match the builtin AIFS row. 2.0 needs fields only the IFS initial conditions carry; 1.1 runs from ERA5 as well.

Runs on the torch runtime on a 24 GB GPU. The network is closed while it runs, which is why the interpolation is done here rather than with earthkit-regrid, which downloads its matrices on first use.

Attribution

AIFS Single 1.1 is © ECMWF, licensed under CC BY 4.0. The initial conditions are ERA5 (Copernicus Climate Change Service), via ARCO-ERA5.