SYSTEM STATUS: ARCHIVE ONLINE /// 240H ROLLING /// GFS 12Z [OK] /// GEFS 12Z [OK] /// HRRR 18Z [OK] /// RRFS 12Z [OK] /// ECMWF IFS 12Z [OK] /// ECMWF AIFS 12Z [OK] /// ECMWF ENS 00Z [OK] /// ECMWF ENS · daily 00Z [OK] /// NBM 18Z [OK] /// NDFD 20Z [OK] ///

Weather Map Maker · Zarr Data Initiative

WEATHER
ZARR

Every model under the sun.
Rolling 240h rolling. Open with xarray.

EXIT

GRIB

Zarr Dr

The Transmuter Engine

Operational weather data lands as massive, slow GRIB2 files. weatherzarr is the transmutation layer — it re-chunks every cycle to cloud-native Zarr and serves it straight over HTTPS, so a client only ever pulls the bytes it touches. No GRIB, no downloads, no keys.

[+] INGEST: RAW NOAA + ECMWF GRIB2 STREAMS
→ TRANSMUTE: RE-CHUNK TO ZARR · SPATIAL + TIMESERIES
[=] SERVE: WEATHERZARR.COM/DATA · HTTPS · NO CREDS

ds = xr.open_zarr("https://weatherzarr.com/data/gfs/20260801/12/spatial/2t.zarr")

Available Routes · 10 Open

0.25° · 6-hourly · 4 vars · 8 cycles

/data/gfs/20260801/12/spatial/2t.zarr

Global Ensemble Mean

0.5° · 6-hourly · 4 vars · 8 cycles

/data/gefs/20260801/12/spatial/2t.zarr

Conus Convection-Allowing

3 km · hourly · 3 vars · 8 cycles

/data/hrrr/20260801/18/spatial/2t.zarr

Conus Rapid-Refresh

3 km · hourly · 3 vars · 8 cycles

/data/rrfs/20260801/12/spatial/tmp2m.zarr

ECMWF IFS0.25°

0.25° · 12-hourly · 11 vars · 8 cycles

/data/ecmwf-ifs025/20260801/12/spatial/tcc.zarr

ECMWF AIFS0.25°

0.25° · 12-hourly · 2 vars · 8 cycles

/data/ecmwf-aifs025/20260801/12/spatial/2t.zarr

ECMWF ENS0.25°

0.25° · 12-hourly · 4 vars · 8 cycles

/data/ecmwf-ens/20260801/00/spatial/2t.zarr

ECMWF ENS · daily0.25°

Ensemble Day-Summaries

0.25° · 12-hourly · 2 vars · 8 cycles

/data/ecmwf-ens-daily/20260801/00/spatial/tmax.zarr

National Blend Of Models

2.5 km · hourly · 4 vars · 8 cycles

/data/nbm/20260801/18/spatial/apcp.zarr

National Digital Forecast

2.5 km · 6-hourly · 22 vars · 8 cycles

/data/ndfd/20260801/20/spatial/apt.zarr