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The Operational Data Sets provide access to most of the data from the atmospheric
model archived at ECMWF. These archives have a higher time and space resolution
and contain all parameters. They should only be used where high resolution
is essential; in this respect they are particularly suited for use in conjunction
with case studies and as initial conditions for high resolution models. These
data sets contain data at the resolution of the data assimilation and forecast
system in operational use at ECMWF. Since the resolution and internal representation
of the archive may vary according to changes in ECMWF's operational practice,
data services associated with these data sets include the provision of interpolation
to requested resolutions and representation forms. This archive includes
analysis, first-guess (6-hour forecasts, 4 times per day) and forecast data. All
data are available on the surface, pressure levels and model levels. Thirteen
data sets are separately supported:
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