[gradsusr] visibility in wrf-nmm - possible solution

[giacomo tricarico]

Hi, t850 needs to be set with "set lev 850, since the variable is "temperature on pressure surface"': how could I incorporate it in your command?
Thank you very much

From: msponsler at comcast.net
Date: Sun, 23 Aug 2015 19:07:19 -0700
To: gradsusr at gradsusr.org
Subject: Re: [gradsusr] visibility in wrf-nmm - possible solution

I think you've done it already:



First set up clevs and colors to suit your tastes



Then:



Define vis = -1.33 + 0.45((2(tsfc - t850)) + (2 (tsfc - tdsfc)) + (2(w850)))



Display sfc



On August 23, 2015 4:58:51 PM PDT, giacomo tricarico <mino-98 at hotmail.it> wrote:



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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Thanks,

Mark Sponsler
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