RE: Planing a flight (Commercial/Airlin) around bad Wx (T-storms, etc.)
Good luck with that one :) I don't know of any site that would be able to give you a route thru the "holes" in the weather as those "holes" could very easily close long before you get there.
These days I don't do many (maybe 1 every 2 years) x country flights that are more than 100nm, but then an Extra 300 isn't exactly a X country machine either :)
ASRock Fatal1ty P67 Performance LGA 1155
G.Skill Sniper series 8 GB 1600 Memory
XFX Double D HD-687A-ZDFC Radeon HD 6870 1GB 256-bit