I've located some backups of the WeatherWiki scripts, files and database and restored these. The good news is that the Wiki seems to be back now, although it's lost it's header and logo but that should be fairly easy to fix. Some of the content may be outdated now, but at least we're back to where we were before the last server crashes. If you had a Wiki account in the past it should still be there. If you'd like to edit the Wiki and you don't have an account please let me know by PM and I'll try to set one up for you (it's been a while so I'll need to refresh my memory of how to do it!)
I'm busy digging through other backups to see what I can find so maybe other 'lost' features will return soon.