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The sample data are based on the output from the current IFS cy49r1 output for the 00 UTC cycle on 30 November 2024 but encoded in GRIB2 as the data which will be produced by IFS cy51r1 cy50r2 are currently expected to be encoded.  All fields provided are global and interpolated to a 1.0° x1.0° regular latitude-longitude grid.

• Data on constant pressure levels (type=pl) are provided at level=100 only.
  
• Data on theta levels (type=pt) are provided at level=300 for type=fc and level=265 only for type=an.
• Data on potential vorticity levels (levtype=pv) are provided at level=1500 only.
• Data on model levels (levtype=ml) are provided at level=1 only.
• Parameters accumulated from the start of the forecast have the ecCodes startStep key consistently set to 0 and, consequently, have stepRange=0-24, etc. 
• Parameters accumulated from the start of the forecast are not provided at stepRange=0. 
• Data from ENS forecasts are provided for a single ensemble member only (number=1).

IFS cy50r2 which will introduce the GRIB2 encoding for all output is currently expected to be implemented in ECMWF's operational forecasts during Q2 2026.

Where to obtain the static sample dataset

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