Coordinated Enhanced Observing Period. See project summary for more information. Please note : On 25-July-2013, the model output files began production on NOAA's new computer system, WCOSS (different hardware and software architecture). Since 11-May-2016 a new model version was used and a change to a new output format (GRIB Version 2) took place. This data is the continuation of experiment CEOP2_NCEP_GRID