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If you know (or can figure out from some Macro code) exactly what your plot is going to show, then you can construct a title with no automatically computed elements. Or you can combine the two.
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Dealing with multiple overlaid fields
Adapt your macro to also read and plot overlay the geopotential data . Use the supplied rh_shade icon to colour the relative humidity field:
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We should also update the parameter names in the title - let's assume that each frame will contain the same parameters (they contain different levels), so we could change field_namesname to this:
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field_namesname = grib_get_string(rh[1], 'name') & ' / ' & grib_get_string(z[1], 'name') |
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Extra Work
Meta-data references in Macro
Continue the work of updating the macro first macro to use nothing but meta-data references so that it does not extract anything from the GRIB header itself and everything is taken at plot time.
The Also, the title just shows the date - add the time of the data.