[gradsusr] visibility in wrf-nmm - possible solution

[giacomo tricarico]

Hi, since grads can not plot Visibility well, I have found a formula for calculating it:
Visibility = −1.33 + 0.45* FOGSI 
where FOGSI is 
2 | Tsfc - T850 | + 2 ( Tsfc - Td sfc ) + 2 W850
where 
Tsfc=temperature near the surface,
 Td sfc= dew point near the surface,
 T850= temperature on 850 hPa level,
 W 850 =wind speed on 850 hPa level. http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.112.260&rep=rep1&type=pdfSince grads can plot all the variables above, how could I generate visibility in grads using that formula?
Thanks all,Giacomo 		 	   		  
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