ECMWF IFS Ensemble — Grib Index Kerchunk reference parquets (v2) Lightweight reference parquets ( [url, offset, length] triplets into the public ECMWF GRIB archive on AWS S3) for streaming the 51 member IFS ensemble without downloading full GRIB files. Built by ICPAC for continuous climate risk monitoring over East Africa (E4DRR / SEWAA). This is v2 : the per level keys fixed catalog ( v20260623 ), spanning all four ECMWF schema eras , superseding the collapsed pressure level E4DRR/gik ecmwf par . Coverage 1256 dates , 00Z, 20230118 → 20260702 , 51 members each (control + ens 01..ens 50), ~21 GB. Continuous except the 6 dates ECMWF never published at 0.4° (20230427, 20230428, 20230429, 20230430, 20230501, 20230502). Era Grid pl levels Control Dates dates 0p4 451×900 (0.4°) 9 bundled enfo 2023 01 18 → 2024 02 28 401 49r1 721×1440 (0.25°) 9→13 bundled enfo 2024 02 29 → 2026 05 12 804 50r1 721×1440 (0.25°) 14 oper (dual stream) 2026 05 13 → present 51 Layout Usage (stream one member) Validation Every era is value validated against Herbie ground truth ( t @ 500/850 hPa): 0.25° eras are bit exact (r=1.000000, RMSE ~1e 4 K); 0.4° r≥0.9997. See validation/herbie intercomparison/ and its s…
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