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<body class='hmmessage'><div dir='ltr'>Hi, since grads can not plot Visibility well, I have found a formula for calculating it:<div><br></div><div>Visibility = −1.33 + 0.45* FOGSI </div><div><br></div><div>where FOGSI is </div><div><span style="font-size: 12pt;"><br></span></div><div><span style="font-size: 12pt;">2 | Tsfc - T850 | + 2 ( Tsfc - Td sfc ) + 2 W850</span></div><div><span style="font-size: 12pt;"><br></span></div><div><span style="font-size: 12pt;">where </span></div><div><br></div><div>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. </div><div><a href="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.112.260&rep=rep1&type=pdf" target="_blank">http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.112.260&rep=rep1&type=pdf</a></div><div>Since grads can plot all the variables above, how could I generate visibility in grads using that formula?</div><div><br></div><div>Thanks all,</div><div>Giacomo</div> </div></body>
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