"As things stand right now weather is the only thing standing in the way of an otherwise flawless countdown for the last Space Shuttle mission. No technical issues are being tracked except for some air conditioner problems in a building in Houston. In other words, this has been "textbook" thus far from the hardware point of view."
7 July update: As torrential showers descend upon Kennedy Space Center, concerns linger as to whether conditions tomorrow at this time will permit a launch to occur. As has been the case in the past bad weather can suddenly yield a favorable window. At this time NASA seems to be intent upon going ahead with the countdown in case this opportunity arises. If weather forces a scrub odds are that there will be 48 hour delay with an attempt on Sunday. A GPS launch currently has the range reserved between 11-5 July and NASA is looking at ways to possibly get 11 July from them.