Jean,
WeatherCat will not create the custom graph unless it's tag (CUSTOMGRAPH$1$ in this case) is actually used in a template that you are processing in the Custom Web section of the On-Line preferences.
You can create a simple HTML template just listing your graphs and they will be generated.
Here is an example of one I use for myself to force creation of the graphs and dials I need for FTP Upload. Just copy the code below, edit the list of graphs as needed. Then save it as graphupload.html or something you choose and place it in the folder you use as the source for Custom Web in the preferences.
Rick
<HTML>
<HEAD>
<META NAME="GENERATOR" CONTENT="WeatherCat Mac">
<TITLE>WeatherCat</TITLE>
</HEAD>
<BODY>
CUSTOMGRAPH$1$
CUSTOMGRAPH$2$
CUSTOMGRAPH$3$
CUSTOMGRAPH$4$
CUSTOMGRAPH$5$
CUSTOMGRAPH$6$
CUSTOMGRAPH$7$
CUSTOMGRAPH$8$
CUSTOMGRAPH$9$
CUSTOMGRAPH$10$
CUSTOMGRAPH$11$
CUSTOMGRAPH$12$
CUSTOMGRAPH$13$
CUSTOMGRAPH$14$
CUSTOMGRAPH$15$
CUSTOMGRAPH$16$
CUSTOMGRAPH$17$
DTEMPO$
DHUMO$
DWINDCH$
DRAIN24$
DBARO$
DWINDS$
DWINDD$
DTEMPI$
DHUMI$
</BODY>
</HTML>