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Hiya Ravi, 1 yes, these are the wind variables. 2 hybrid is a vertical dimensionless coordinate, for RUC2 look at: http://www.nws.noaa.gov/om/tpb/448body.htm Also you can google hybrid coordinates for information. Using ToolsUI: t z y x U-component_of_wind 0, 49, 336, 450 t y x U-component_of_wind_tropopause 0, 336, 450 U-component_of_wind_height_above_ground 0, 0, 336, 450 V-component_of_wind0, 49, 336, 450 V-component_of_wind_tropopause 0, 336, 450 V-component_of_wind_height_above_ground 0, 0, 336, 450 Don't forget to look at Variable documentation at: http://www.unidata.ucar.edu/software/netcdf-java/v2.2.20/javadoc/ucar/nc2/class-use/Variable.html Robb... Ticket Details =================== Ticket ID: QDJ-903556 Department: Support netCDF Java Priority: Normal Status: Open