I just found out about this last night. Neat that it goes to google earth and tells the weather conditions from where you are shooting.
http://apps.vortexoptics.com/lrbc/
http://apps.vortexoptics.com/lrbc/
I tried it a couple years ago and it works pretty good. I think it would gain more popularity if they would make an iPhone/iPad app for it instead of just the website version.