Hi,
I upload icon.jpg as part of the html file uploads every 5 mins.
You go into VWS Icon settings to have it generate the icon.jpg file.
I use Metar with Smart forecast override to get a reasonable Sky conditions. I override the icon rain based on rain rate, etc.
Then I edited the USA.htx (which generated index.html) to reference icon.jpg instead of pointing to wundergrounds icon..
here is the snip:
<td bgcolor="#CCCCFF" height="19"><b><font face="Arial">Current Conditions
</font></b>
<font color="#808080" size="1" face="Arial">[Auto-updates every 5 minutes]
</font></td>
</tr>
<tr>
<td align="center" height="16">
<p align="center"><font size="2" face="Arial">Updated: <b>4:01pm on 3/7/17</b></font></p>
</td>
</tr>
<tr>
<td align="center" height="16">
<p align="center"><font size="2" face="Arial">(<a href="
http://www.mapquest.com/maps/map.adp?latlongtype=decimal&latitude=37.0882797&longitude=-122.0347366">location</a>)</font></td>
</tr>
<tr>
<td align="center" height="72">
<table border="1" cellspacing="0" bordercolor="#CCCCFF">
<tr>
<td rowspan="2" align="center" bgcolor="#53ff53"><b><font face="Arial">Currently:<br>
</font><font face="Arial" size="5">56.4°</font></b></td>
<td rowspan="2" align="center" bgcolor="#E1E1E1">
<p align="center"><font face="Arial"><b><img height="72" alt="Clear" src="icon.jpg" border="0"> <br>
</b></font></td>