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This icon derives (and returns) a vertical average cross sectional data unit of upper air fields. For each upper air field, this average is taken along the North-South or East-West direction over a specified rectangular area and then interpolated horizontally along the direction perpendicular to the averaging direction with a spacing consistent with the resolution of the input GRIB data.

The average cross section data can be plotted (using a default visualisation and with the plot area based on the range of data values) or saved as a NetCDF data file.A related icon, Average View, is used to provide average cross section plotting specifications. You can use it to visualise an average cross-section without explicitly deriving the average cross-section data - see Views..

If access to the output computed values is not required, or for more control of the plotting, use the Average View icon.

The macro language equivalent is mxs_average().

The Average Data Editor

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Specifies the data (GRIB icon) from which to derive the average profile. The input GRIB icon must specify a multi-level (pressure or model levels) upper air meteorological variable, in a latitude-longitude or Gaussian grid. If the input data is specified in model levels, you must include the parameter LNSP should you want the vertical axis of the plot in pressure levels rather than model levels when visualising the output. Note that the input fields should be on the same grid. If more than one time and/or forecast step is contained in the GRIB icon, Average returns a set of average cross sections.

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