<div dir="ltr"><div>Hi,</div><div><br></div>You can always use a formula to convert liquid water content (LWC) (QCLOUD) at the lowest level into visibility. See for example the formulas given in the next paper:<div><br></div><div><div>Kunkel BA. 1984. Parameterization of droplet terminal velocity and extinction coefficient in fog models. J. Clim. Appl. Meteorol. 23: 34–41.</div></div><div><br></div><div>Best regards.</div><div><br></div><div>Carlos</div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-02-16 17:09 GMT+01:00 Tiago Luna <span dir="ltr"><<a href="mailto:tiagoluna@ua.pt" target="_blank">tiagoluna@ua.pt</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Some years ago I came across with this
work:<br>
<br>
<a href="https://www.researchgate.net/profile/Ji_Woo_Lee/publication/277004271_Predictability_Experiments_of_Fog_and_Visibility_in_Local_Airports_over_Korea_using_the_WRF_Model/links/555d00b608ae8c0cab2a6aef.pdf" target="_blank">https://www.researchgate.net/profile/Ji_Woo_Lee/publication/277004271_Predictability_Experiments_of_Fog_and_Visibility_in_Local_Airports_over_Korea_using_the_WRF_Model/links/555d00b608ae8c0cab2a6aef.pdf</a><br>
<br>
Please take a moment to read it and search for some of it's
references. I don't know if there is any recent work about this.<br>
<br>
Regards,<br>
Luna<br>
<br>
<br>
On 15-02-2016 05:27, Sundar J wrote:<br>
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<div dir="ltr">
<div>As the subject suggest, is there any formula exist for
calculating surface visibility? I have seen some of the
weather sites which shows the visibility plots (mostly from
GFS as input data). Is there any way that to plot the surface
visiblity parameter using parameters from wrfout file?<br>
<br>
</div>
<div>I have read some of the some of the scientific paper which
indicates none of the models has visibility as one of the
output parameter. Why does it so?<br>
</div>
<div><br>
</div>
Regards<br>
</div>
</blockquote>
<br>
</div>
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