Steve,
I had been using the PC version for years then tried the Mac version when I got my iMac a couple weeks ago. The Mac version was nice, but just seemed like a bad port of the PC one. The MySQL database seemed to be different on the Mac. When I started it up, it told me I was missing colomns, I don't remember which ones, so I figured I could live without the database. Then when I upgraded to Mavericks, Weather Display would suddenly stop gathering data. It thought it was but the numbers were never changing. I tried all sorst of fixes, reinstalling WD, the USB drivers, taking a hub off, but nothing worked. That's when I discovered WeatherCat.
At first I was looking at all the log files that WD created and tried to figure out a way to parse them and create the cat files but was overwhelmed by the amount of data. After I wrote the script to convert the database over it hit me that I could create the cat files from the database, like some people have done with Wunderground.
You do see a lot of people asking for a converter and other people saying they made a database or did it manually, but they don't say how or post the file. Obviously they will if you ask, like Rick did, but I figured it would be helpful to just post it. If anyone has a DB other than WD that they would like a script to convert, either to the WC database or cat file, I'd be more than happy to modify the one's I've writen for them.
Steve